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dc.contributor.authorMwanga, Stanley F.
dc.contributor.authorPogrebnaya, Tatiana P.
dc.contributor.authorPogrebnoi, Alexander M.
dc.date.accessioned2019-05-24T11:50:53Z
dc.date.available2019-05-24T11:50:53Z
dc.date.issued2016-05-11
dc.identifier.issn2331-2009
dc.identifier.urihttp://dx.doi.org/10.1080/23312009.2016.1186582
dc.identifier.urihttp://dspace.nm-aist.ac.tz/handle/123456789/209
dc.descriptionResearch Article published by Cogent OAen_US
dc.description.abstractThe properties of trimer Cs3X3 and tetramer Cs4X4 (X = Br, I) molecules have been studied using DFT with B3LYP5 functional and MP2 and MP4 methods. Two equilibrium geometrical structures of trimers, hexagonal (D3 h) and “butterflyshaped” (Cs), and one for tetramers, distorted cubic (Td), are confirmed to exist; geometrical parameters and vibrational spectra are determined. The relative concentration of Cs3X3 isomers has been evaluated; the butterfly-shaped isomer dominates over hexagonal in saturated vapour in a broad temperature range. The dissociation reactions through different channels have been considered and enthalpies of formation ΔfH°(0) of clusters determined:−858 ± 20 kJ mol−1 (Cs3Br3), −698 ± 20 kJ mol−1 (Cs3I3), −1270 ± 30 kJ mol−1 (Cs4Br4) and −1045 ± 30 kJ mol−1 (Cs4I4). The Gibbs free energies ΔrG°(T) calculated for the dissociation reactions of trimer and tetramer molecules have indicated that these molecules are resistive in narrow temperature range only and decompose spontaneously with temperature increase with elimination of dimer molecules.en_US
dc.language.isoen_USen_US
dc.publisherCogent OAen_US
dc.subjectmolecular clusteren_US
dc.subjectrelative concentrationen_US
dc.subjectenthalpy of dissociation reactionen_US
dc.subjectEnthalpy of formationen_US
dc.titleMolecular clusters Cs3X3 and Cs4X4 (X = Br, I): Quantum chemical study of structure and thermodynamic propertiesen_US
dc.typeArticleen_US


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