Crystal structure of dicaesium octa-µ3-chloro-hexachloro-octahedro-hexa-tungstate(II) and -molybdate(II) complexes
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The crystal structures of the title compounds have been determined from single-crystal photographic X-ray diffraction data by Patterson and Fourier techniques, and refined by block-diagonal least-squares methods. Cs2[(W6Cl8)Br6] : trigonal, P31c, a= 10簷 ᠰ簳, c= 14緵 ᠰ簱 Ż Z= 2; R= 0籱 for 665 observed reflections. Cs2[(Mo6Cl8)Br6] : trigonal, P31c, a= 10簶 ᠰ簲, c= 14緰 ᠰ簱 Ŭ Z= 2; R 0籲 for 598 observed reflections.The anion consists of an octahedral cluster of metal atoms with the chlorine atoms bridging the octahedral faces and the bromine atoms axially co-ordinated to the M6 core. The mean metal-metal distances are W-W 2網0 ᠰ簰7 and Mo-Mo 2綱5 ᠰ簰6 Ů Other bonding distances are as expected. Implications of the structure concerning the vibrational spectrum are discussed. Cell dimensions are given for the range of isomorphous complexes Cs2[(M6Cl8)Y6], M = Mo or W; Y = Cl, Br, or I.
Journal of the Chemical Society : Dalton Transactions : Inorganic Chemistry
Copyright 1973 Royal Society of Chemistry. Please refer to the journal link for access to the definitive, published version.