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Infrared and Raman spectra of the metal cluster compound [Nb 6 F 12 ]F 3  (cubic Im3̄m; Z = 2) are reported. The three intense m odes observed in the Raman spectrum at 215. 267, and 337 cm -1  and a weak mode observed in the infrared spectrum at 287 cm -1  are assigned to the T 2g , E g , A 1g , and T 1u  vibrational modes of the Nb 6  octahedra. The assignment is supported by normal coordinate analysis and Raman measurements at 47 kbar. The valence force constants are f(Nb-F i ) = 2.04, f(Nb-F a-a ) = 1.30 and f(Nb-Nb) = 0.97 N cm -1  metal-to-metal interaction in the cluster.

Schwingungsspektren der Clusterverbindung Nb 6 F 15 /Vibrational Spectrum of the Cluster Compound Nb 6 F 15