Issue 48, 2011

Neutral coordination polymers based on a metal–mono(dithiolene) complex: synthesis, crystal structure and supramolecular chemistry of [Zn(dmit)(4,4′-bpy)]n, [Zn(dmit)(4,4′-bpe)]n and [Zn(dmit)(bix)]n (4,4′-bpy = 4,4′-bipyridine, 4,4′-bpe = trans-1,2-bis(4-pyridyl)ethene, bix = 1,4-bis(imidazole-1-ylmethyl)-benzene

Abstract

This article describes a unique synthetic route that enables a neutral mono(dithiolene)metal unit, {Zn(dmit)}, to link with three different organic molecules, resulting in the isolation of a new class of neutral coordination polymers. The species {Zn(dmit)} coordinates with 4,4′-bipyridine (4,4′-bpy), trans-1,2-bis(4-pyridyl)ethene (4,4′-bpe) and 1,4-bis(imidazole-1-ylmethyl)-benzene (bix) as linkers giving rise to the formation of coordination polymers [Zn(dmit)(4,4′-bpy)]n (1), [Zn(dmit)(4,4′-bpe)]n (2) and [Zn(dmit)(bix)]n (3) respectively. Compounds 1–3 were characterized by elemental analyses, IR, diffuse reflectance and single crystal X-ray diffraction studies. Compounds 1 and 3 crystallize in the monoclinic space groupP21/n, whereby compound 2 crystallizes in triclinic space group P[1 with combining macron]. In the present study, we chose three linkers 4,4′-bpy, 4,4′-bpe and bix (see Schemes 1–3, respectively, for their structural drawings), that differ in terms of their molecular dimensions. The crystal structures of compounds 1–3 are described here in terms of their supramolecular diversities that include π–π interactions, not only among aromatic stacking (compounds 1 and 3), but also between an aromatic ring and an ethylenic double bond (compound 2). The electronic absorption spectroscopy of compounds 1–3 support these intermolecular π–π interactions.

Graphical abstract: Neutral coordination polymers based on a metal–mono(dithiolene) complex: synthesis, crystal structure and supramolecular chemistry of [Zn(dmit)(4,4′-bpy)]n, [Zn(dmit)(4,4′-bpe)]n and [Zn(dmit)(bix)]n (4,4′-bpy = 4,4′-bipyridine, 4,4′-bpe = trans-1,2-bis(4-pyridyl)ethene, bix = 1,4-bis(imidazole-1-ylmethyl)-benzene

Supplementary files

Article information

Article type
Paper
Submitted
02 May 2011
Accepted
22 Sep 2011
First published
03 Nov 2011

Dalton Trans., 2011,40, 12901-12908

Neutral coordination polymers based on a metal–mono(dithiolene) complex: synthesis, crystal structure and supramolecular chemistry of [Zn(dmit)(4,4′-bpy)]n, [Zn(dmit)(4,4′-bpe)]n and [Zn(dmit)(bix)]n (4,4′-bpy = 4,4′-bipyridine, 4,4′-bpe = trans-1,2-bis(4-pyridyl)ethene, bix = 1,4-bis(imidazole-1-ylmethyl)-benzene

V. Madhu and S. K. Das, Dalton Trans., 2011, 40, 12901 DOI: 10.1039/C1DT10814J

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