Tri- and diorganostannates containing 2-( N, N-dimethylaminomethyl)phenyl ligand

Abstract

The C, N-chelated tri and diorganotin(IV) chlorides react with both protic mineral acids and carboxylic acids. The nitrogen atom of the L CN ligand (where L CN is 2-(dimethylaminomethyl)phenyl) is thus quarternized – protonated and new Sn–X bond (X = Cl, Br, I or the remainder of the starting acid used) is simultaneously formed. The set of zwitterionic tri and diorganostannates containing protonated 2-(dimethylaminomethyl)phenyl-moiety was prepared and structurally characterized by multinuclear NMR spectroscopy and XRD techniques. In all these cases, the intramolecular N–H⋯X bond is present in the molecule. Despite the central tin atom remains five-coordinated (except for the [HL CNH] +[( n-Bu) 2SnCl(NO 3) 2] −) and reveals a distorted trigonal bipyramidal geometry, the 119Sn NMR chemical shift values of these zwitterionic stannates are somewhat shifted to the higher field than corresponding starting C, N-chelated tri and diorganotin(IV) halides. Reactions of C, N-chelated organotin(IV) halides with various Lewis acids are also discussed.