Synthesis and characterization of diethyltin-based three dimensional self-assemblies derived from sulfonate–phosphonate ligands

Abstract

Diethyltin(methoxy)methanesulfonate reacts readily with equimolar amount of t-butylphosphonic acid (RT, 8–10 h) in moist dichloromethane and methanol to afford [(Et 2Sn) 6(O 3PBu t ) 4(OSO 2Me) 4·CH 2Cl 2] n ( 1) and [(Et 2Sn) 6(O 3PBu t ) 4(OSO 2Me) 4·2H 2O] n ( 2), respectively. The identity of these compounds has been established by IR, multinuclear ( 1H, 13C, 31P and 119Sn) NMR as well as X-ray crystallographic studies. Despite apparent similarity in the composition, a marked difference in the structural motifs between 1 and 2 is evident in the solid state. For 1, the formation of three-dimensional self- assembly results from μ 3-phosphonate and μ 2, μ 3-sulfonate binding modes and exhibits continuous channel of voids which are occupied by disordered CH 2Cl 2 molecules. In contrast, the sulfonate ligands in 2 act exclusively in μ 2-fashion and hydrogen bonding interactions (O–H⋯O) between coordinated water molecules and methanesulfonate groups is significant in the construction of 3D supramolecular assembly.