Unexpected fromation of a dimeric cation-anionic complex of hypercoordinated tin in the reaction of bis](2-oxopyrrolidino)methyl]tin dichloride with AgBF_4

摘要

A new cation-anionic complex of hypercoordinated tin, {[L_2Sn(OH)]~+BF_4~-}_2 (L is a bidentate (2-oxopyrrolidino)methyl C,O-chelating ligand), was obtained by the reaction of L_2SnCl_2 with AgBF_4 and structurally characterized by X-ray diffraction analysis. In crystalline form, the BF_4~- anoins are bound to the dications through O-H...F hydrogen bonds (the H-F distance is 1.78 A). The octahedral coordination of the Sn atoms is strongly distorted because of a weak additional interaction with solvate molecules of dioxane (the Sn-O distance is 3.16 A).