Tri- and diorganostannates containing 2-(N,N-dimethylaminomethyl)phenyl ligand
摘要:
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 e 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 center dot center dot center dot X bond is present in the molecule. Despite the central tin atom remains five-coordinated (except for the [(HLH)-H-CN](+)[(n-Bu)(2)SnCl(NO3)(2)](-)) and reveals a distorted trigonal bipyramidal geometry, the Sn-119 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. (C) 2010 Elsevier B.V. All rights reserved.