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The molecular structure of (Ph 3 SnO 2 C) 3 C 6 H 3  reveals distorted tetrahedral C 3 O geometries for each tin atom. No intermolecular Sn...O associations occur between the molecules so that the trinuclear molecule may be considered monomeric. An increase in coordination number at tin is indicated by  119 Sn NMR measurements conducted in d 6 -DMSO solution and this has been confirmed by a structure analysis of (DMSO·Ph 3 SnO 2 C) 3 C 6 H 3 ·2 DMSO. In this structure, the tin atom geometries are distorted trigonal bipyramidal, existing within  trans -C 3 O 2  donor sets. Thus, while is it possible for the tin atoms to increase their coordination numbers in (Ph 3 SnO 2 C) 3 C 6 H 3 , molecular aggregation to form polymeric arrays is precluded, most likely due to steric constraints.

Synthesis and structure of tris(triphenyltin)benzene-1,3,5-tricarboxylate and its tri-DMSO adduct