Relationship Between the J(Sn–C–H) of the Dimethyltin Dichloride Adducts of some Pyridines and Anilines, and the Donor Strength of the Lewis Bases

✍ Scribed by Josiah J. Bonire; Neelam S. N. Jalil; G. A. Ayoko; Andrew A. Omachi

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 425 KB
• Volume: 10
• Category: Article
• ISSN: 0268-2605
• DOI: 10.1002/(sici)1099-0739(199606)10:5<369::aid-aoc481>3.0.co;2-5

✦ Synopsis

A study by titrimetric methods of the donor strength of pyridine and aniline and some of their parasubstituted derivatives, and the J(119Sn-C-H) of their adducts with dimethyltin dichloride in nitrobenzene, has shown that the PKb of a Lewis base and its para-substituted derivatives varies linearly with the J(119Sn-C-H) of the adducts of dimethyltin dichloride (Me*Sn(S12), with the Lewis base dissolved in an inert solvent.

A graphical plot of the pKb of a given series of Lewis bases versus the J(Sn-C-H) of their complexes with MezSnClz in nitrobenzene (at the same temperature, and same complex concentration) gives a straight line with a negative gradient, making possible the deduction of the other parameter (e.g. p&) for a Lewis base in the series, where the one parameter (e.g. J(Sn-C-H) is known. The graph for each series of Lewis base has its own characteristic gradient, and the gradients appear proportional in magnitude to the donor strengths of each class of the bases, making it possible to deduce from such graphs which series of Lewis bases are the stronger donors.