LIGATION TO TIN(IV) ORGANOMETALLICS: CRYSTAL STRUCTURE OF TRIBENZYL(CHLORO)(4-N,N'-DIMETHYLAMINOPYRIDINE)TIN(IV)

摘要

The preparation and characterization of the air-stable, five-coordinate complex of 4-(dimcthyl-amino)pyridine with tribenzyltin chloride is reported. The complex crystallizes in space group P2_1 with a= 10.3743(17), 6 = 24.356(17), c= 10.628(2)A, beta=102.504(15) deg. Single crystal X-ray analysis confirms the structure to be monomeric in which the geometry around tin is a trigonal bipyramid with equatorial benzyl groups. The ~(119)Sn NMR signal of the complex in CDCl_3 occurs upfield with respect to the corresponding signal in (C_6H_5CH_2)_3SnCl, indicating lack of dissociation of the ligand in solution. Computations using the PM3 hamiltonian for the complex yielded a trigonal bipyramidal structure with satisfactory agreement in metrical parameters with those obtained from X-ray analysis.