Synthesis and Characterization of Cobalttelluride Clusters with the Cubic Body-Centered Co9Te6(CO)8 Core |
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Authors: | Alexander Ebner Joachim Wachter Manfred Zabel |
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Institution: | (1) Institut für Anorganische Chemie, Universität Regensburg, D-93040 Regensburg |
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Abstract: | Reduction of Cp2NbTe2H (Cp=tBuC5H4) with CH3Li results in a red-violet solution which reacts with Co2(CO)8 to give the neutral cluster {Cp2Nb(CO)}2Co9Te6(CO)8] (2) and a mixture of salts, from which Na(THF)6]Co9Te6(CO)8] (4) was obtained by crystallization from THF in very poor yield, probably due to Na impurities in CH3Li. Clusters 2 (123 valence electrons) and 4 (122 valence electrons) possess hexacapped cubic Co@Co8 cores. The structure of 2 was identified by comparison of spectroscopic data with those of parent clusters: Two Cp2Nb(CO) fragments are fixed at two opposite
4-Te bridges of the Co9Te6(CO)8 skeleton. A crystal structure determination of 4 shows this compound to contain discrete ions. Nearly equal diameters of ca. 10.5Å for the Co9Te6(CO)8]– anion and the octahedral Na(THF)6]+ cation as well as electrostatic interactions between them and attractive C–HO contacts may be responsible for the formation of layers throughout the crystal. |
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Keywords: | cobalt cluster compounds niobium tellurium crystal structure |
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