Synthesis, spectroscopic and structural features of diorganotin(IV) oximates derived from 9,10-phenanthrenequinone monooxime

Abstract

Reactions of monofunctional 9,10-phenanthrenequinone monooxime with dialkyl/diaryl-tin dichloride in desired molar ratios in refluxing benzene affords corresponding dialkyl-/diaryl-tin(IV) oximates, which have been characterized by elemental analyses (C, H, N and Sn), IR, multinuclear (¹H, ¹³C and ¹¹⁹Sn) NMR and mass spectroscopy. On the basis of calculation of C-Sn-C bond angle from coupling constant, trigonal-bipyramidal and octahedral geometry are proposed for the chelates <b>5a-5c</b> and <b>6a-6c</b>. Semiempirical studies have been carried out to understand the tautomeric and conformational behaviour of the ligand.