Preparation and 119Sn NMR Spectra of Coordination Compounds of Di-t-butyltin(IV) Derivatives

Article abstract of DOI:10.1246/bcsj.56.1057

Di-t-butyltin bis(chelates) were prepared and characterized in comparison with dimethyltin analogs. 119Sn NMR spectra show a six-coordinate configuration for the acetylacetonate, tropolonate, and oxinate; a nonchelating structure is partially involved in the 2-methyloxinate and dialkyldithiocarbamates. Di-t-butyltin dichloride gives no isolable adducts with monodentate ligands; however, the Job's continuous variation method using 119Sn NMR spectra has revealed that complexations with 2:1 and/or 1:1 donor/Sn molar ratios occur in ether. It has been concluded that t-butyl group reduces the acceptor property of tin by means of both inductive and steric effects.