The Synthesis of SomeN,N-Dialkylselenocarbamate Complexes of Tin(IV), and Their Infrared and PMR Spectra

Several N,N-dialkylselenocarbamate complexes of tin(IV), (CH3)2Sn[OSeCNR2]2 (1), (CH3)2ClSn[OSeCNR2] (2) (R=CH3 and C2H5) and (CH3)3Sn[OSeCN(CH3)2] (3), have been prepared, and their infrared and proton magnetic resonance spectra have been examined. The results indicate that in 1 and 2 the selenocarbamate ligands are coordinated to the tin atom in a bidentate manner, although the coordination of the oxygen atom is weak. On the other hand, 3 has a tetra-coordinate tin with a free carbonyl bond. The configurations of these complexes are discussed and compared with those of the corresponding thio-, dithio-, diseleno-, and thioselenocarbamate complexes of tin(IV).