Abstract
Compounds of composition Mo 6− x M x X 8 (X = Se, Te) are composed of units in which the Mo 6− x M x trigonal antiprismatic metallic cluster is surrounded by eight chalcogens in a distorted cubic array. The cluster-metal to chalcogen intra cluster separations in the Mo 6− x M x X 8 compounds are shorter than those in the binary compounds Mo 6Se 8 and Mo 6Te 8 whereas similar distances in the closely related Chevrel phase compounds M x Mo 6X 8 are longer. The 125Te Mössbauer spectra recorded from compounds of the type Mo 6− x Ru x Te 8 and Mo 5.5Rh 0.5Te 8 show that the shorter metal to chalcogen intra cluster distances result from the polarisation of tellurium 5 p electrons by high oxidation state ruthenium or rhodium ions. Polarisation is enhanced by the incorporation of larger concentrations of ruthenium into the metal cluster.
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