INDAZOLE COMPLEXES OF DIORGANOTIN(IV) DIHALIDES - THE CRYSTAL-STRUCTURES OF DICHLORO AND DIBROMODIMETHYLBIS(INDAZOLE)TIN(IV)

Reaction of indazole (HInd) with diorganotin(IV) dihalides yielded com pounds of the type [SnR2X2(HInd)(2)] (R = Me, Et, Bu and Ph; X = Cl, B r). The structures of the dihalodimethylbis(indazole)tin(IV) complexes were determined by X-ray crystallography. These are trans-octahedral centrosymmetric compounds with the following bond lengths (Angstrom) a round the tin atom: Sn-Cl 2.590(2), Sn-N 2.377(6), Sn-C 2.12(1) in the chloride; and Sn-Br 2.733(1), Sn-N 2.370(5) and Sn-C 2.12(1) in the b romide. Mossbauer and vibrational spectra suggest similar trans stereo chemistry for the other complexes prepared. The behaviour of these com pounds in solution was studied by conductimetry and NMR techniques.