| Abstract
| - The compounds X3Sn(CH2)nSnX3 react with halide X- to form the 1:2 adducts [X4Sn(CH2)nSnX4]2- for X = Cl, Br and the 1:4 adducts [X5Sn(CH2)nSnX5]4- when X = F. Surprisingly, the tin compounds appear to react only as bis(monodentate) Lewis acids.
- The reactions between X3Sn(CH2)nSnX3 (X =Cl, Br; n = 1, 3, 4, 8) and halide in solution aredescribed. 119Sn NMR spectroscopy (CD2Cl2) indicatesformation of five-coordinate dinuclear 1:2 adducts,[X4Sn(CH2)nSnX4]2-, with chloride and bromide. Atrigonal-bipyramidal geometry has been confirmed in thesolid state for the compound having X = Cl and n = 4.In contrast, fluoride reacts with X3Sn(CH2)nSnX3 to givesix-coordinate tin species, [F5Sn(CH2)nSnF5].- Therewas no evidence indicating that the tin atoms could actas a bidentate acid.
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