FTIR spectra of thiophene in Ar and N-2 matrices. Co-condensation with Cu and CO

Solid state low temperature spectrum and matrix isolation spectra of thioph ene in Ar and N-2 matrices were recorded. The IR spectra of thiophene + CO + Cu mixtures in Ar and N-2 matrices were also studied. DFT calculations re vealed that only very weak thiophene-Cu complexes could be expected. We fou nd that in pseudo gas state thiophene formed complexes with Cu-0, in which Cu atom was co-ordinated to thiophene above the or C and/or beta C atom of the ring. No displacement of CO group(s) of Cu-x(CO)(y) carbonyl complexes by thiophene has been observed. Neither was any interaction observed betwee n thiophene and mono-copper type Cu(CO)(y) (y = 1-3) complexes, while, in A r, for mono-carbonyls of small copper clusters of the type of Cu-x(CO) (x = 2), very weak interactions with thiophene were suggested. (C) 1999 Elsevie r Science B.V. All rights reserved.