Supramolecular arrays of the [Re 6(μ 3-Se) 8] 2+ core-containing clusters mediated by transition metal ions

Abstract

Vapor diffusion of diethyl ether into a methanol/dichloromethane (v/v, 1:1) solution of M(NO 3) 2 (M=Cd 2+, Co 2+, Zn 2+) and the site-differentiated solvated cluster trans-[Re 6(μ 3-Se) 8(PEt 3) 4(4,4 ′-dipyridyl) 2](SbF 6) 2 afforded supramolecular arrays featuring the [Re 6(μ 3-Se) 8] 2+ core-containing clusters mediated by the transition metal ions. The cluster complex with two 4,4 ′-dipyridyl moieties can be viewed as an expanded dipyridyl ligand, serving to coordinate the transition metal ions via a pair of N pyridyl–M dative bonds. All compounds have been characterized by microanalysis (CHN) and their solid-state structures have been established by single crystal X-ray diffraction. Two polymorphous forms ( 1 and 2) of the crystal of M  Cd 2+ have been obtained, one of which ( 1) exhibits a highly porous structure, whereas the other ( 2) displays a wavy one-dimensional arrangement. The latter form is isostructural with the complex with Co 2+ ( 3). In the case of Zn 2+ ( 4), the cluster complex ligand and the mediating Zn 2+ are arranged in a zigzag fashion, with an average N pyridyl–M–N pyridyl angle bond of 88°.