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Item Open Access Synthesis, electrochemistry, and density functional theory of osmium(II) containing different 2,2′:6′,2″-terpyridines(MDPI, 2024) Mateyise, Nandisiwe G. S.; Conradie, Marrigje M.; Conradie, JeanetIn coordination chemistry, 2,2′:6′,2″-terpyridine is a versatile and extensively studied tridentate ligand. Terpyridine forms stable complexes with a variety of metal ions through coordination sites provided by the three nitrogen atoms in its pyridine rings. This paper presents an electrochemical study on various bis(terpyridine)osmium(II) complexes, addressing the absence of a systematic investigation into their redox behavior. Additionally, a computational chemistry analysis was conducted on these complexes, as well as on eight previously studied osmium(II)-bipyridine and -phenanthroline complexes, to expand both the experimental and theoretical understanding. The experimental redox potentials, Hammett constants, and DFT-calculated energies show linear correlations due to the electron-donating or electron-withdrawing nature of the substituents, as described by the Hammett constants. These substituent effects cause shifts to lower or higher redox potentials, respectively.Item Open Access Unexpected XPS binding energy observations further highlighted by DFT calculations of ruthenocene-containing [Irᴵᴵᴵ(ppy)₂(RCOCHCORc)] Complexes: Cytotoxicity and Crystal Structure of [Ir(ppy)₂(FcCOCHCORc)](MDPI, 2024) Buitendach, Blenerhassitt E.; Erasmus, Elizabeth; Fourie, Eleanor; Malan, Frederick P.; Conradie, Jeanet; Niemantsverdriet, J. W. (Hans); Swarts, Jannie C.The series of iridium(III) complexes, [Ir(ppy)₂(RCOCHCOR′)], with R = CH₃ and R′ = CH₃ (1), Rc (2), and Fc (3), as well as R = Rc and R′ = Rc (4) or Fc (5), and R = R′ = Fc (6), ppy = 2-phenylpyridinyl, Fc = Feᴵᴵ(η⁵–C₅H₄)(η⁵–C₅H₅), and Rc = Ruᴵᴵ(η⁵–C₅H₄)(η⁵–C₅H₅), has been investigated by singlecrystal X-ray crystallography and X-ray photoelectron spectroscopy (XPS) supplemented by DFT calculations. Here, in the range of 3.74 ≤ ΣχR ≤ 4.68, for Ir 4f, Ru 3d and 3p and N 1s orbitals, binding energies unexpectedly decreased with increasing ΣχR (ΣχR = the sum of Gordy group electronegativities of the R groups on β-diketonato ligands = a measure of electron density on atoms), while in Fe 2p orbitals, XPS binding energy, as expected, increased with increasing ΣχR. Which trend direction prevails is a function of main quantum level, n = 1, 2, 3. . ., sub-quantum level (s, p, d, and f), initial state energies, and final state relaxation energies, and it may differ from compound series to compound series. Relations between DFT-calculated orbital energies and ΣχR followed opposite trend directions than binding energy/ΣχR trends. X-ray-induced decomposition of compounds was observed. The results confirmed good communication between molecular fragments. Lower binding energies of both the Ir 4f₇/₂ and N 1s photoelectron lines are associated with shorter Ir-N bond lengths. Cytotoxic tests showed that 1 (IC₅₀ = 25.1 μM) and 3 (IC₅₀ = 37.8 μM) are less cytotoxic against HeLa cells than cisplatin (IC₅₀ = 1.1 μM), but more cytotoxic than the free β-diketone FcCOCH₂COCH₃(IC₅₀ = 66.6 μM).Item Open Access Synthesis and characterization of graphene oxide (GO) for the removal of lead ions in water(Elsevier, 2024) Mokoena, L. S.; Mofokeng, J. P.The synthesis and characterization of graphene oxide (GO) for water related applications has become an increasing area of research. GO was prepared via Hummer's method, and analysed for structure, morphology, thermal stability, and the ability to remove heavy lead ions from solution. In FTIR analyses, hydroxyl, carboxyl and ester groups were found to be on the structure of GO. XRD showed the interlayer spacing to have increased from graphite to graphene oxide, whereby the average crystallite size of GO was 16.13. Then SEM confirmed the morphology of GO to be exfoliated and wrinkled, with stacked layers. In TGA, EG degraded in a single step, while GO degraded in three distinct steps. When using AAS to analyse the Pb (II) ion intake properties of GO, it showed a maximum adsorption of 98.1% for 600 ppm lead ion solution. The Freundlich isotherm model was consistent with this adsorption, meaning that adsorption took place on a heterogenous surface, on a multilayer basis. The value of n for this isotherm was 0.1474, implying a dominant chemical adsorption. A significant contribution was done to the structure of GO, with its metal adsorption properties clearly portrayed.Item Open Access A review on graphene (GN) and graphite oxide (GO) based biodegradable polymer composites and their usage as selective adsorbents for heavy metals in water(MDPI, 2023) Mokoena, Lesia Sydney; Mofokeng, Julia PuseletsoWater pollution due to heavy metal ions has become a persistent and increasing problem globally. To combat this, carbonaceous materials have been explored as possible adsorbents of these metal ions from solution. The problem with using these materials on their own is that their lifespan and, therefore, usability is reduced. Hence the need to mask them and an interest in using polymers to do so is picked. This introduces an improvement into other properties as well and opens the way for more applications. This work gives a detailed review of the major carbonaceous materials, graphene and graphene oxide, outlining their origin as well as morphological studies. It also outlines the findings on their effectiveness in removing heavy metal ions from water, as well as their water absorption properties. The section further reports on graphene/polymer and graphene oxide/polymer composites previously studied and their morphological as well as thermal properties. Then the work done in the absorption and adsorption capabilities of these composites is explored, thereby contrasting the two materials. This enables us to choose the optimal material for the desired outcome of advancing further in the utilization of carbonaceous material-based polymer composites to remove heavy metal ions from water.Item Open Access Tuneable blue to orange phosphor from Sm3+ doped ZnAl2O4 nanomaterials(Elsevier, 2022) Khambule, S. P.; Motloung, S. V.; Motaung, T. E.; Koao, L. F.; Kroon, R. E.; Malimabe, M. A.Undoped and Sm3+ doped ZnAl2O4 nanopowders were synthesized using the co-precipitation method and annealed at 750 ℃ for 3.5 h. The aim of this study was to investigate the effect of varying the Sm3+ concentration on the ZnAl2O4 structure, morphology, and optical properties. The X-ray diffraction analysis confirmed that the samples have a face-centred cubic structure. Crystallite size decreased with an increase in Sm3+ concentration. Scanning electron microscopy revealed that the addition of Sm3+ slightly influence the morphology of the samples. Transmission electron microscopy confirmed a slight decrease in particle sizes. Energy-dispersive X-ray spectroscopy analysis confirmed the anticipated elemental composition. Ultraviolet–visible spectroscopy showed an increase in bandgap compared to the host. Photoluminescence analysis indicated that doping with Sm3+ induced defects within ZnAl2O4. The emission peaks observed around 380, 401, 451, 500, and 739 nm are attributed to host material. The emission peaks at 564, 601, and 649 nm correspond to the 5G5/2 → 6H5/2, 6H7/2, and 6H9/2 transition of Sm3+, respectively. The highest luminescence intensity was found for the 0.5 % Sm3+ sample. The CIE colour chromaticity diagram showed that the emission colour could be tuned from bluish to nearly white to orange.Item Open Access Spectroscopic behaviour of copper(II) complexes containing 2-hydroxyphenones(MDPI, 2022) Chiyindiko, Emmie; Langner, Ernst H. G.; Conradie, JeannetTheoretical investigations by density functional theory (DFT) and time-dependent DFT (TD-DFT) methods shed light on how the type of ligand or attached groups influence the electronic structure, absorption spectrum, electron excitation, and intramolecular and interfacial electron transfer of the Cu(II) complexes under study. The findings provide new insight into the designing and screening of high-performance dyes for dye-sensitized solar cells (DSSCs).Item Open Access Redox data of tris(polypyridine)manganese(II) complexes(MDPI, 2022) Mtshali, Zinhle; Von Eschwege, Karel G.; Conradie, JeanetVery little cyclic voltammetry data for tris(polypyridine)manganese(II) complexes, [MnII(N^N)3]2+, where N^N is bipyridine (bpy), phenanthroline (phen) or substituted bpy or phen ligands, respectively; are available in the literature. Cyclic voltammograms were found for tris(4,7-diphenyl-1,10-phenanthroline)manganese(II) perchlorate only. In addition to our recently published related research article, the data presented here provides cyclic voltammograms and corresponding voltage-current data obtained during electrochemical oxidation and the reduction of four [MnII(N^N)3]2+ complexes, using different scan rates and analyte concentrations. The results show increased concentration and scan rates resulting in higher Mn(II/III) peak oxidation potentials and increased peak current-voltage separations of the irreversible Mn(II/III) redox event. The average peak oxidation and peak reduction potentials of the Mn(II/III) redox events stayed constant within 0.01 V. Similarly, the average of the peak oxidation and reduction potentials of the ligand-based reduction events of [MnII(N^N)3]2+ were constant within 0.01 V.Item Open Access Photocatalytic decomposition of an ago dye using transition-metal-doped tungsten and molybdenum carbides(American Chemical Society, 2022) Mabuea, Busiswe Petunia; Swart, Hendrik Christoffel; Erasmus, ElizabethThe preparation, characterization, and photocatalytic application of tungsten or molybdenum carbides (Ni-WC, 1, Co-WC, 2, Ni-MoC, 3, Co-MoC, 4, NiCo-WC, 5, NiCo-MoC, 6, NiFe-WC, 7, and NiFe-MoC, 8) doped with transition metals (Fe, Co, and Ni) are reported. These transition-metal carbide (TMC) particles show that the submicrometer globular particles agglomerated to form larger particles, with smaller crystallites present on the surface of the large particles. These crystallite sizes range between 4 and 34 nm (as calculated from X-ray diffraction data) depending on the metal dopant and type of carbide. Oxidation of the metal carbides is evident from the two sets of photoelectron lines present in the X-ray photoelectron spectroscopy (XPS) of the W 4f area. The Mo 3d spectra reveal four sets of photoelectron lines associated with oxidized MoO2 and MoO3 as well as Mo2+ and Mo3+ associated with MoC1–x. The XPS of the dopant metals Ni, Co, and Fe also show partial oxidation. The photocatalytic decomposition of Congo red (an azo dye) is used as a model reaction to determine the photocatalytic activities of the transition-metal carbides, which is related to the TMCs’ optical band gap energies.Item Open Access Trends in coordination of rhenium organometallic complexes in the Protein Data Bank(IUCr, 2022) Brink, Alice; Jacobs, Francois J. F.; Helliwell, John R.Radiopharmaceutical development has similar overall characteristics to any biomedical drug development requiring a compound's stability, aqueous solubility and selectivity to a specific disease site. However, organometallic complexes containing 188/186Re or 99mTc involve a d-block transition-metal radioactive isotope and therefore bring additional factors such as metal oxidation states, isotope purity and half life into play. This topical review is focused on the development of radiopharmaceuticals containing the radioisotopes of rhenium and technetium and, therefore, on the occurrence of these organometallic complexes in protein structures in the Worldwide Protein Data Bank (wwPDB). The purpose of incorporating the group 7 transition metals of rhenium/technetium in the protein and the reasons for study by protein crystallography are described, as certain PDB studies were not aimed at drug development. Technetium is used as a medical diagnostic agent and involves the 99mTc isotope which decays to release gamma radiation, thereby employed for its use in gamma imaging. Due to the periodic relationship among group 7 transition metals, the coordination chemistry of rhenium is similar (but not identical) to that of technetium. The types of reactions the potential model radiopharmaceutical would prefer to partake in, and by extension knowing which proteins and biomolecules the compound would react with in vivo, are needed. Crystallography studies, both small molecule and macromolecular, are a key aspect in understanding chemical coordination. Analyses of bonding modes, coordination to particular residues and crystallization conditions are presented. In our Forward look as a concluding summary of this topical review, the question we ask is: what is the best way for this field to progress?Item Open Access UV-Vis spectroscopy, electrochemical and DFT study of tris(β-diketonato)iron(III) complexes with application in DSSC: role of aromatic thienyl groups(MDPI, 2022) Conradie, Marrigje M.A series of tris(β-diketonato)iron(III) complexes, with the β-diketonato ligand bearing different substituent groups, have been synthesized and characterized by Fourier transform infrared (FT-IR), ultraviolet-visible (UV-Vis) and mass spectroscopic methods. The maximum band UV-Vis absorption wavelengths of the tris(β-diketonato)iron(III) complexes were in the range of 270–380 nm. The complexes have very good solubility in various solvents such as chloroform, dichloromethane, ethyl acetate, tetrahydrofurane, dimethylsulphoxide and dimethylformamide. After the syntheses and characterization processes, spectroscopic and electrochemical properties of these tris(β-diketonato)iron(III) complexes were investigated. A density functional theory (DFT) study related to the spectroscopic and electrochemical properties of the tris(β-diketonato)iron(III) complexes was used to investigate the possible application of these complexes as dye sensitizers or redox mediators in dye-sensitized solar cells.Item Open Access Trans–cis kinetic study of azobenzene-4,4′-dicarboxylic acid and aluminium and zirconium based azobenzene-4,4′-dicarboxylate MOFs(MDPI, 2022) Mogale, Refilwe; Conradie, Jeanet; Langner, Ernst H. G.Metal organic frameworks (MOFs) are porous hybrid crystalline materials that consist of organic linkers coordinated to metal centres. The trans–cis isomerisation kinetics of the azobenzene-4,4′-dicarboxylic acid (AZB(COOH)2) precursor, as well as the Al3+ (Al-AZB)- and Zr4+ (Zr-AZB)-based MOFs with azobenzene-4,4′-dicarboxylate linkers, are presented. The photo-isomerization in the MOFs originates from singly bound azobenzene moieties on the surface of the MOF. The type of solvent used had a slight effect on the rate of isomerization and half-life, while the band gap energies were not significantly affected by the solvents. Photo-responsive MOFs can be classified as smart materials with possible applications in sensing, drug delivery, magnetism, and molecular recognition. In this study, the MOFs were applied in the dye adsorption of congo red (CR) in contaminated water. For both MOFs, the UV-irradiated cis isomer exhibited a slightly higher CR uptake than the ambient-light exposed trans isomer. Al-AZB displayed a dye adsorption capacity of over 95% for both the UV-irradiated and ambient light samples. The ambient light exposed Zr-AZB, and the UV irradiated Zr-AZB had 39.1% and 44.6% dye removal, respectively.Item Open Access Octakis(dodecyl)phthalocyanines: influence of peripheral versus non-peripheral substitution on synthetic routes, spectroscopy and electrochemical behaviour(MDPI, 2022) Swart, Glendin; Fourie, Eleanor; Swarts, Jannie C.Non-peripherally octakis-substituted phthalocyanines (npPc’s), MPc(C12H25)8 with M = 2H (3) or Zn (4), as well as peripherally octakis-substituted phthalocyanines (pPc’s) with M = Zn (6), Mg (7) and 2H (8), were synthesized by cyclotetramerization of 3,6- (2) or 4,5-bis(dodecyl)phthalonitrile (5), template cyclotetramerization of precursor phthalonitriles in the presence of Zn or Mg, metal insertion into metal-free phthalocyanines, and removal of Mg or Zn from the phthalocyaninato coordination cavity. The more effective synthetic route towards pPc 8 was demetalation of 7. npPc’s were more soluble than pPc’s. The Q-band λmax of npPc’s was red-shifted with ca. 18 nm, compared to that of pPc’s. X-ray photoelectron spectroscopy (XPS) differentiated between N–H, Nmeso and Ncore nitrogen atoms for metal-free phthalocyanines. Binding energies were ca. 399.6, 398.2 and 397.7 eV respectively. X-ray photoelectron spectroscopy (XPS) also showed zinc phthalocyanines 4 and 6 have four equivalent Nmeso and four equivalent N–Zn core nitrogens. In contrast, the Mg phthalocyanine 7 has two sets of core N atoms. One set involves two Ncore atoms strongly coordinated to Mg, while the other encompasses the two remaining Ncore atoms that are weakly associated with Mg. pPc’s 6, 7, and 8 have cyclic voltammetry features consistent with dimerization to form [Pc][Pc+] intermediates upon oxidation but npPc’s 3 and 4 do not. Metalation of metal-free pPc’s and npPc’s shifted all redox potentials to lower values.Item Open Access Kinetic study of the oxidative addition reaction between methyl iodide and [Rh(imino-β-diketonato)(CO)(PPh)3] complexes, utilizing UV–vis, IR spectrophotometry, NMR spectroscopy and DFT calculations(MDPI, 2022) Ferreira, Hendrik; Conradie, Marrigje Marianne; Conradie, JeanetThe oxidative addition of methyl iodide to [Rh(β-diketonato)(CO)(PPh)3] complexes, as modal catalysts of the first step during the Monsanto process, are well-studied. The β-diketonato ligand is a bidentate (BID) ligand that bonds, through two O donor atoms (O,O-BID ligand), to rhodium. Imino-β-diketones are similar to β-diketones, though the donor atoms are N and O, referred to as an N,O-BID ligand. In this study, the oxidative addition of methyl iodide to [Rh(imino-β-diketonato)(CO)(PPh)3] complexes, as observed on UV–Vis spectrophotometry, IR spectrophotometry and NMR spectrometry, are presented. Experimentally, one isomer of [Rh(CH3COCHCNPhCH3)(CO)(PPh3)] and two isomers of [Rh(CH3COCHCNHCH3)(CO)(PPh3)] are observed—in agreement with density functional theory (DFT) calculations. Experimentally the [Rh(CH3COCHCNPhCH3)(CO)(PPh3)] + CH3I reaction proceeds through one reaction step, with a rhodium(III)-alkyl as the final reaction product. However, the [Rh(CH3COCHCNHCH3)(CO)(PPh3)] + CH3I reaction proceeds through two reaction steps, with a rhodium(III)-acyl as the final reaction product. DFT calculations of all the possible reaction products and transition states agree with experimental findings. Due to the smaller electronegativity of N, compared to O, the oxidative addition reaction rate of CH3I to the two [Rh(imino-β-diketonato)(CO)(PPh)3] complexes of this study was 7–11 times faster than the oxidative addition reaction rate of CH3I to [Rh(CH3COCHCOCH3)(CO)(PPh3)].Item Open Access Dimethylsulfoxide (DMSO) clusters dataset: DFT relative energies, non-covalent interactions, and cartesian coordinates(Elsevier, 2022) Malloum, Alhadji; Conradie, JeanetTheoretical understanding of dimethylsulfoxide (DMSO) liquid depends on the understanding of the DMSO clusters. In this work, we provide the structures and the energetics of the DMSO clusters. The structures have been generated using ABCluster and further optimized at the MP2/aug-cc-pVDZ level of theory. The final structures have been optimized at two different levels of theory: PW6B95D3/aug-cc-pVDZ and ωB97XD/aug-cc-pVDZ. The Cartesian coordinates of the structures optimized at the MP2/aug-cc-pVDZ level of theory are also reported. The relative energies of the structures can be used to locate the most favorable structures of the DMSO clusters. The Cartesian coordinates of the structures can be used for further investigations on DMSO clusters. In addition, we report the data related to the quantum theory of atoms in molecule (QTAIM) analysis of the investigated clusters. The QTAIM data reported in this work can be used to understand and determine the nature of non-covalent interactions in DMSO clusters. For further reading and discussion on the data reported here, please report to the original manuscript Malloum and Conradie (2022).Item Open Access Review of DFT-simulated and experimental electrochemistry properties of the polypyridyl Row-1 Mn, Fe & Co, and Group-8 Fe, Ru and Os MLCT complexes(Elsevier, 2022) Von Eschwege, Karel G.; Conradie, JeanetRuthenium had up to date been pivotal in electro- and photocatalytic applications involving reduction of CO2 and H2O, and dye-sensitized solar cells. Commercial applications would seek use of earth-abundant metals instead. Towards this goal, it is key to review the synthesis, electrochemical and spectroscopical properties of associated metal-to-ligand charge transfer complexes of row-4 (Mn, Fe & Co) and column-8 (Fe, Ru & Os). The present report is limited to data obtained under exactly similar conditions, providing scientifically valid correlations. Only tris-coordinated bipyridyl and phenanthroline complex derivatives are considered, being representative of catalysts and dyes traditionally used in the above-mentioned fields. The accuracy of theoretical DFT techniques to simulate complex properties is highlighted.Item Open Access Data to understand the nature of non-covalent interactions in the thiophene clusters(Elsevier, 2021) Malloum, Alhadji; Conradie, JeanetWe have reported herein the data to understand the nature and number of non-covalent interactions that stabilize the structures of the thiophene clusters. In addition, we have also provided the optimized Cartesian coordinates of all the structures of the investigated thiophene clusters. Initially, the geometries have been generated using the ABCluster code which performs a global optimization to locate local and global minima structures of molecular clusters. The located geometries have been optimized at the MP2/aug-cc-pVDZ level of theory using Gaussian 16 suite of programs. To understand the nature of non-covalent interactions, we have performed a quantum theory of atoms in molecules (QTAIM) analysis on all the structures of the thiophene dimer. Furthermore, the QTAIM analysis has been performed also on the most stable structure of the thiophene trimer and tetramer. We have used the AIMAll program to perform the QTAIM analysis. The data reported in this paper contains the critical points, the bonds paths and their related properties, for each investigated structures. Besides, the data contains the optimized Cartesian coordinates of all the investigated structures of the thiophene clusters. This can be use for any further investigations involving thiophene clusters. For further information and analysis, the reader is referred to the original related research article (Malloum and Conradie, 2022).Item Open Access Polypyridyl copper complexes as dye sensitizer and redox mediator for dye-sensitized solar cells(Elsevier, 2021) Conradie, JeanetDevelopments on the application of polypyridyl-based copper complexes in dye-sensitized solar cells (DSSCs) are briefly discussed in this mini review. Copper complexes in solar cells are special in that they can be used either as dye sensitizer and/or as redox mediator (redox couple) in dye-sensitized solar cells (DSSCs). Both the abundance and low cost of copper motivates research on the use of copper complexes, as cheaper and non-toxic alternative to the mostly used iodide/triiodide (I- /I3- ) electrolyte redox couple, and the expensive and rare rutheniumbased dyes of good performance, which currently are best known.Item Open Access Density functional theory calculated data of the iodomethane oxidative addition to oligothiophene-containing rhodium complexes – importance of dispersion correction(Elsevier, 2021) Mateyise, Nandisiwe Ghandi Sibongile; Conradie, Jeanet; Conradie, Marrigje M.Electronic and free energy data of density functional theory calculated optimized geometries of the reactants, transition state of the oxidative addition reaction and different reaction products of the [Rh(RCOCHCOCF 3 )(CO)(PPh 3 )] + CH 3 I reactions (R = C 4 H 3 S, C 4 H 3 S-C 4 H 2 S and C 4 H 3 S-C 4 H 2 S-C 4 H 2 S) are presented to illustrate the influence of the amount of thiophene groups, the implicit solvent and dispersion correction on the calculated energies. All calculations were done with the B3LYP functional, in gas as well as in solvent phase, with and without dispersion correction. The data can save computational chemists time when choosing an appropriate method to calculate reaction energies of oxidative addition reactions. Detailed knowledge of energies involved in the oxidative addition reaction of methyl iodide to rhodium complexes have an important implication in catalysis, for example the Monsanto process where methanol is converted to acetic acid catalysed by a rhodium complex. For more insight in the reported data, see the related research article “Synthesis, characterization, electrochemistry, DFT and kinetic study of the oligothiophene-containing complex [Rh((C 4 H 3 S- C 4 H 2 S)COCHCOCF 3 )(CO)(PPh 3 )]”, published in Polyhedron.Item Open Access QTAIM analysis dataset for non-covalent interactions in furan clusters(Elsevier, 2021) Malloum, Alhadji; Conradie, JeanetFuran clusters are very important to understand the dynam- ics and properties of the furan solvent. They can be used combined with quantum cluster equilibrium theory to theo- retically determine the thermodynamics properties of the fu- ran solvent. To understand the structures of the furan clus- ters, one needs to understand the non-covalent interactions that hold the furan molecules together. In this paper, we have provided the data necessary to understand the non-covalent interactions in furan clusters. Firstly, the structures of the furan clusters have been generated using classical molecu- lar dynamics as implemented in the ABCluster code. Sec- ondly, the generated structures have been fully optimized at the MP2/aug-cc-pVDZ level of theory. The optimized Carte- sian coordinates of all the investigated structures are re- ported in this work to enable further investigations of the furan clusters. These Cartesian coordinates will save compu- tational time for all further investigations involving the fu- ran clusters. Thirdly, to understand the nature of the non- covalent interactions in furan clusters, we have performed a quantum theory of atoms in molecule (QTAIM) analysis using AIMAll program. Using QTAIM, we have provided the critical points, bond paths and their related properties for all the in- vestigated structures. These data can be used to identify and classify the non-covalent interactions in furan clusters.Item Open Access Free energy and enthalpy data of neutral and protonated clusters in the solvent phase(Elsevier, 2021) Malloum, Alhadji; Conradie, JeanetStructures of neutral and protonated acetonitrile in the sol- vent phase are important to describe proton behavior and to calculate thermodynamic quantities related to the solva- tion of ions or molecules in acetonitrile. In this work, we provide data related to the calculation of the solvation free energy and enthalpy of the proton in acetonitrile. We have thoroughly explored the potential energy surfaces (PESs) of neutral and protonated acetonitrile clusters from dimer to heptamer in the solvent phase at both MN15/6–31 ++ G (d,p) and MP2/aug-cc-pVDZ levels of theory. We report the struc- tures and relative stability of neutral and protonated acetoni- trile clusters in the solvent phase at the MN15/6–31 ++ G (d,p) level of theory. In addition, enthalpies and free energies of neutral and protonated acetonitrile are also reported at the MP2/aug-cc-pVDZ and MP2/CBS levels of theory. Further- more, Cartesian coordinates of the clusters in the solvent phase as optimized at the MP2/aug-cc-pVDZ level of theory are provided as supplementary file. The data provided in this work will be useful for further investigations that would in- volve neutral and protonated acetonitrile clusters. The free energies and enthalpies of the investigated clusters in the solvent phase have been used to compute the solvation free energy and enthalpy of the proton in acetonitrile. For more insights on the solvation free energy and enthalpy of the pro- ton in acetonitrile, see the related main research paper.