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Golubev, Aleksei V.; Kubasov, Alexey S.; Bykov, Alexander Yu; Zhdanov, Andrey P.; Buzanov, Grigorii A.; Korlyukov, Alexander A.; Zhizhin, Konstantin Yu; Kuznetsov, Nikolay T.
International journal of molecular sciences, 10/2022, Letnik: 23, Številka: 19Journal Article
A new series of compounds based on perbrominated disubstituted sulfonium derivatives of the closo-decaborate anion (n-Bu4N)2-B10Br9SR2 (R = n-Pr, i-Pr, n-Bu, n-C8H17, n-C12H25, n-C18H37) was obtained, characterised by modern physicochemical methods of analysis. According to the results of an X-ray diffraction study, some of the anions and solvate molecules were disordered. The cations (n-Bu4N)+ and anions 2-B10Br9SR2− were associated via C-H…Br and H…H contacts. In addition, Br…Br interactions between anions were revealed. The role of these contacts was analysed in terms of Hirshfeld surface analysis, QTAIM theory and the NCI method using quantum chemical calculations. An increase in the size of the alkyl R moiety led to significant strengthening of the total energy of H…H interactions. In the case of R = -n-C18H37, a parallel mutual orientation of alkyl moieties was established that was similar to the packing of salts of fatty acids. The nature of C-H…Br and Br…Br interionic interactions was found to be attractive, in contrast to the repulsive nature of intermolecular Br…Br interactions.
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