Direct hydrolysis of hydrated organotin cations: synthesis and structural characterization of {[n-Bu₂Sn(OH₂)(Phen)(O₃SC₆H₃-2,5-Me₂)]⁺[2,5-Me₂C₆H₃SO₃]^-} (Phen = 1,10-phenanthroline) and {[n-Bu₂Sn(μ -OH)(O₃SC₆H₃-2,5-Me₂)]₂}_n

Abstract

The reaction of {[n-Bu₂Sn(OH₂)₄]²⁺[2,5-Me₂C₆H₃SO₃^-]₂} (2) with 1,10-phenanthroline affords {[n-Bu₂Sn(OH₂)(Phen)(O₃SC₆H₃-2,5-Me₂)]⁺[2,5-Me₂C₆H₃SO₃]^-} (3) by the displacement of two water molecules by the chelating phenanthroline ligand and one water molecule by a sulfonate ligand. In contrast, 2 undergoes hydrolysis on treatment with pyridine, resulting in the formation of {[n-Bu₂Sn(μ -OH)(O₃SC₆H₃-2,5-Me₂)]₂}_n (4). Formation of 4 also occurs in the reaction of 3 with pyridine as well as in a 1:1 reaction of [n-Bu₂SnO]_n with 2,5-Me₂C₆H₃SO₃H·2H₂O. The molecular structure of 3 contains a six-coordinate tin with a coordination environment comprising the chelating phenanthroline ligands, two butyl substituents, one water molecule, and one sulfonate ligand. Extensive hydrogen-bonding interactions (O-H---O, C-H---O, and O---π ) in the crystal structure result in the formation of a three-dimensional supramolecular architecture for 3. The crystal structure of 4 reveals that it is a two-dimensional coordination polymer. The basic repeat unit of the coordination polymer contains a [Sn(μ-OH)]₂ distannoxane ring. Anisobidentate coordination action of the sulfonate ligand results in the generation of 20-membered macrocycles, which are linked to each other to form the two-dimensional coordination polymer network.