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 SM ISO690:2012FURMANOVA, N, VERIN, I., GELMBOLDT, Vladimir, GANIN, Eduard, WANG, Wen-Jwu, SIMONOV, Yurii A., FONARI, Marina. Supramolecular isomerism in the system [Crown-Ether.H3O]MF6 (M= Ta, Nb). In: Physical Methods in Coordination and Supramolecular Chemistry, 27 septembrie - 1 octombrie 2006, Chişinău. Chisinau, Republic of Moldova: 2006, XVII, p. 126. ISBN 978-9975-62-066-6. |
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| Physical Methods in Coordination and Supramolecular Chemistry XVII, 2006 |
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Conferința "The XV-th International Conference Physical Methods in Coordination and Supramolecular Chemistry : The XVII-th Reading in memory of Acad. A.Ablov" Chişinău, Moldova, 27 septembrie - 1 octombrie 2006 | |
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| Pag. 126-126 | |
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Supramolecular isomerism (SI) in coordination polymers has received increasing interest n recent years for fundamental and applied reasons [1]. he occurrence of SI implies superstructural diversity for a given building block. We report the crystal structures a given building block. We report the crystal structures or the systems, [CE(crown-ether).H O]MF (M=Ta, Nb), f 3 6 where CE=benzo-18C6, cis-syn-cis-DCH18C6, which afford novel examples of SI. It was stated the influence of the synthetic route on the crystallography of the final product: the interaction of Ta2O5 with HF in the presence of corresponding CE results in the monoclinic modifications regardless of CE used (P2 /n both), while interaction of TaF with CE in the medium of HF results in an orthorhombic isomer for [B18C6.H3O]TaF6 (Pbca) and triclinic one (P-1) for [DCH18C6.H3O]TaF6. For these latter complexes the isostructural Nb counterparts were obtained. For [B18C6. H3O]TaF6 the distinction between the isomers is dictated by the packing conditions of the quite similar building blocks (fig.), while in [DCH18C6.H3O]TaF6 the macrocyclic molecule exhibits strictly different conformations in monoclinic and triclinic modifications [2,3]. schemeMonoclinic and orthorhombic isomers for [B18C6.H3O]TaF6 |
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