Vibrational frequencies of the encapsulated carbon atom of the carbido carbonyl cluster CO6C(CO)12S2 determined through selective 13C labelling

Abstract

Co₆C(CO)₁₂S₂ containing 90%¹³C in the central carbide position has been prepared and its i.r. spectrum compared with that of an unlabelled sample; the bands at 819 and 548 cm^–1(at 790 and 535·5 cm^–1, respectively, for ¹³C) have been identified as belonging to the vibrations A″₂ and E′, respectively, of the encapsulated carbon atom.