SYNTHESIS AND CHARACTERIZATION OF ADDUCTS OF DIMETHYLTIN(IV) DIHALIDES (CL, BR) WITH 1-HYDROXYMETHYLPYRAZOLE - THE CRYSTAL AND MOLECULAR-STRUCTURE OF DICHLORO(1-HYDROXYMETHYLPYRAZOLE)DIMETHYLTIN(IV)

Two adducts of 1-hydroxymethylpyrazole (PzCH2OH) with dimethyltin(IV) dihalides, SnMe2X2(PzCH2OH) (X = Cl, Br), were prepared and characterized by mass, IR, Raman and NMR techniques. The crystal structure of SnMe2Cl2(PzCH2OH) was determined by X-ray crystallography and refined to R = 0.053, based on 2124 observed reflections. The compound is monoclinic, space group P2(1)/n, with a = 9.740(2), b = 7.325(2), c = 15.983(3) angstrom and beta = 90.27(3)-degrees. The organic ligand is weakly bonded to Sn through the oxygen atom. The tin atom is five-coordinate trigonal bipyramidal with one Cl and the O atom in apical positions. It is reasonable to think that a similar structure is adopted by the bromine homologue.