Darstellung und Eigenschaften trimerer Chlorotellurate(IV)

B e r n t K r e b s * u n d V o l k e r P a u l a t Anorganisch-Chemisches Institut der Universität Münster, Gievenbecker W e g 9, D-4400 Münster Z. Naturforsch. 34b , 900-905 (1979); eingegangen am 2. Apri l 1979 Chlorotellurates(IV), Chalcogen Halogen Compounds, Inert Electron Pair, Crystal Structure The trimeric chlorotellurate(IV) ion Te3Cli3~ is obtained in benzene solution as a degradation product o f cubane-like tetrameric tel lurium(IV) chloride Te4Cli6 and can be isolated b y crystallization in the f o rm of salts with large cations. The crystal structure of the triphenyl-methyl salt (CeHs^CTesClis (P2x/c, a = 1109.5, b = 1644.4, c = 2043.9 pm, ß = 114.50°) shows the Te3Cli3 _ ion to have approximate C3V s ymmetry ; as a fragment of the Te4Cli6 cube it consists of three edge-sharing octahedra with a central triply bridging Cl. Bond distances Te -Cl (tripl.br.) 292.4-298.4, Te -C l (doubl .br. ) 270.6-286.3, Te-Cl (term.) 232.0-238.8 pm. The vibrational spectrum of Te3Cli3~ is discussed.