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The synthesis and structural features of the oxygen-capped cluster, [(n-BuSn(OH)O2P (OBut)2)3O] [O2P(OBut)2] (l), are compared to that of the analogous formulations containing framework sulfur atoms in place of oxygens, [(n-BuSn(S) (OH)OP(OBut)2)3S] [O2P(OBut)2]·2H2S·H2O (2) and [(n-BuSn)3(S)(O)(O2CPh)5] (3). Solution NMR, 119Sn and 31P, indicate that the solid state structures determined by X-ray analysis are retained in solution.