INFRARED MATRIX-ISOLATION AND CRYOGENIC THIN-FILM SPECTROSCOPIC STUDYOF MOLECULAR-COMPLEXES OF DIMETHYLCADMIUM WITH GROUP-VI ORGANICS

Molecular complexes of (CH3)(2)Cd with a series of alkyl derivatives c ontaining different organic functional groups of the group VI elements have been formed, isolated and characterized in argon matrices and cr yogenic thin films. For each system, a 1:1 complex was identified base d on band positions and the product yield as a function of the concent rations of the two precursors in the reaction. For several systems, a 1:2 complex was observed as well at relatively high base/acid concentr ation ratios. Each complex was characterized by several perturbed vibr ational modes, including the shifted CdC2 antisymmetric stretching mod e for all the complexes. Comparison of the band positions with those o btained in previous studies of related complexes indicates that (CH3)( 2)Cd is a very weak Lewis acid, yet these complexes are still stable u nder cryogenic conditions whether in solid argon or in solid thin film s.