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Spectroscopic investigations of M(CO)<inf>5</inf>-C<inf>60</inf> (M = W, Mo) complexes: Precursors for metal fullerides
Date Issued
01-01-1999
Author(s)
Resmi, M. R.
Smitha, K.
Arunagiri, T. N.
Pradeep, T.
Abstract
Photochemical reactions of M(CO)6 (M = W, Mo) with C60 in solution yield η2-complexes of M(CO)5 with C60. The complexes have been characterized by IR, UV/VIS, NMR and DSC. They do not show any orientational ordering down to 12 K and all the infrared bandwidths remain the same down to this temperature. The complexes can be decomposed thermally or photochemically yielding metal fullerides, which show characteristic reduction in peak width in the variable temperature IR spectra due to orientational ordering. Transitions are manifested in calorimetric studies also. Metal→C60 charge-transfer is observed in IR and XPS. A high temperature IR study of the C60-W(CO)5 complex reveals sequential elimination of the carbonyls yielding MC60. The study shows that carbonyl complexes can be used as precursors to make transition metal fullerides.
Volume
7