175350-86-4Relevant articles and documents
Tin(IV) and organotin(IV) complexes containing mono or bidentate N-donor ligands-I. 1-benzylimidazole derivatives
Pettinari, Claudio,Marchetti, Fabio,Cingolani, Augusto,Bartolini, Stefano
, p. 1263 - 1276 (1996)
The interaction between 1-benzylimidazole, L, and several tin(IV) and organotin(IV) acceptors in diethyl ether or THF, gave 1 : 1 [(L)R3SnCl] (R = Me or Ph), 2 : 1 [(L)2RnSnX4-n] (R = Me, n = 2, X = Cl or Br ; R - Et, Bu or Ph, n = 2, X = Cl, Br or I; R = cy, n = 2, X = Br or I; R = Me, Ph or Bu, n = 0 or 1, X = Cl; R = Me, n = 0 or 1, X = I; n = 0, X = Br), [(L)2Ph2SnBrCl] and 4 : 1 [(L)4(CH3)2Sn]I2, adducts which are air- and thermally stable solids. The compounds have been characterized in the solid state and in solution by analyses, spectral (IR and 1H, 13C and 119Sn NMR) data and conductivity measurements. The molecular weight determinations and the NMR data indicate that the triorganotin complexes generally dissociate in chloroform and in acetone solution, whereas only a slight dissociation of the di-, tri- and tetrahalidetin(IV) adducts in CHCl3 is found : these [(L)2RnSnX4-n] complexes most likely retain the six-coordinate configuration. They are not fluxional when n = 0 or 1. The 119Sn NMR chemical shift is a function of the number and type of substituents directly linked to the tin atom. In the diorganotin derivatives, the coupling constants 2J119Sn-1H and 1J119Sn-13C were used to establish the stereochemistry of the tin atom by applying the Lockhart and Holecek equations, which allow the magnitude of the C - Sn - C bond angles to be derived.
