Synthesis, characterization and hydrolytic stability of diorganotin(IV)bis(O -alkyl alkylphosphonate)s

Diorganotinbis(O-alkyl alkylphosphonate)s, RSn(O P(OR)R) [R = Me, R = Me (1), Et (2), n-Bu (3); R = Et, R = Me (4), Et (5), n-Bu (6)] have been synthesized from the reaction between dimethyl/diethyl/di-n-butyltin dichloride and dialkyl alkylphosphonates, (RO)P(O)R , in a solvent-free medium (120 °C, 18 h).X-ray crystal structure of 1 reveals two independent molecules in the unit cell that form one-dimensional polymeric motifs by virtue of bridging bidentate phosphonate groups.The structural attribute of each polymeric chain represents an orderly infinite array of-[Sn-O-P-O-] 8-membered puckered cyclic rings with hexa-coordinated tin atoms.The structure of 2 resembles that of 1 and exhibits nearly identical structural parameters.The presence of C- H···O hydrogen bonding interactions involving P-OMe and (or) phosphonate (P=O) groups in both 1 and 2 afford the formation of two-and three-dimensional structural motifs, respectively.The phase purity and structural integrity of the bulk sample of 1 upon exposure to water has been ascertained by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM).All the compounds reported herein have been characterized by IR and multinuclear (H, C, P, Sn) NMR spectral studies.