VARIABLE-TEMPERATURE TIN-119M MOESSBAUER STUDY OF TIN(II) AND TIN(IV) AMINES

Abstract : The dependence of the logarithm of the area under the tin-119m Mossbauer resonance (normalized to the area under the resonance at 77K), 1nA sub T, on temperature in K is measured for two tin(IV) and three tin(II) amines containing the N(CH3)2, N(CH2)2 and the N(Si(CH3)3)2 groups. The sloped of the plots of 1nA sub T vs. T are in increasing order of relative steepness, (CH3)3SnN(CH2)2(-0.0116/K for T = 77-140K), Sn(N(N2)2)2, Sn(N(CH3)2)2 (-0.0155/K for T = 77-155K) and Sn(N(Si(CH3)3)2)2 (0.0195/K for T = 77-150K) for the tin(II) compounds. Based on the systematics of the relation between the magnitudes of the slopes and known structures of tin solids, it is possible to assign bridged polymeric structures to the first four compounds and a structure composed of non-interacting molecular units to the last. (Author)