Synthesis, Characterization, and Hydrolytic Behavior of Diorganotin(IV) Coordination Polymers with Layered Structural Motifs

Abstract

The synthesis and structural characterization of the layered diorganotin coordination polymers nBu2Sn(HL)(OSO2Me) (1) and nBu2Sn(HL1)(OSO2Me) (2) derived from the silaalkylphosphonic acids RR12Si(CH2)3P(O)(OH)2 [R = Ph, R1 = Me (H2L); R = R1 = Et (H2L1)] are presented. The structure of H2L exhibits O-H···O hydrogen bonding and π-π interactions to form a unique three-dimensional supramolecular assembly in the solid state. The asymmetric units of 1 and 2 are composed of centrosymmetric eight-membered [-Sn-O-P-O-]2 cyclic rings with appended sulfonate groups, which provide layered connectivity to the structures. For 1, the presence of C-H···π interactions between the dangling phenyl rings of the silaalkyl chains favors a lamellar arrangement with an interlayer spacing of 16.9 A. Upon exposure to humid conditions, these polymers undergo slow transformation to nBu2Sn[O3P(CH2)3SiRR12] with the elimination of methanesulfonic acid.