Synthesis and characterization of some organotin(IV) adducts containing a related series of pyridines: Crystal structure of [SnMe2Cl2(bu2bpy)]

Organotin(IV) complexes of [SnR(4-n)Cln] (n = 2, R = Me, Bu-n; n = 1, R = Ph) react with the bidentate pyridyl ligand 4,4'-di-tert-butyl-2,2'-bipyridine (bu(2)bpy) to give hexa-coordinated adducts with the general formula [SnR(4-n)Cln(bu(2)bPY)]. However, the reaction of these organotin(IV) complexes with the corresponding monodentate ligand 4-tert-butylpyridine (bupy) resulted in the formation of the hexa-coordinated complex [SnMe2Cl2(bupy)(2)] and the penta-coordinated complexes [SnR(4-n)Cln(bupy)] (bupy)] (n = 2, R = Bu-n: n = 1, R = Ph). Moreover, the reaction of the above organotin(IV) complexes with 4,4'-trimethylenedipyridine (tmdp) yields hexa-coordinated adducts with the general formula [SnR2Cl2(tmdp)] (R = Me, Bu-n) and the penta-coordinated complex [ClPh3Sn-mu-(tmdp)SnPh3Cl] in the solid state. The resulting complexes have been characterized by multinuclear NMR (H-1, C-13, Sn-119) spectroscopy and elemental analysis. NMR data shows that the triphenyltin(IV) adducts are not stable in solution and dissociate to give tetra-coordinated tin(IV) complexes. The X-ray crystal structure determination of [SnMe2Cl2(bu(2)bpy)] reveals that the tin atom is hexa-coordinated in an octahedral geometry with a trans-[SnMe2] configuration. (C) 2010 Published by Elsevier Ltd.