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Toward absolute asymmetric synthesis of coordination polymers with bidentate sulfide ligands

Journal article
Authors Theonitsa Kokoli
Susanne Olsson
Per Martin Björemark
Staffan Persson
Mikael Håkansson
Published in Journal of Organometallic Chemistry
Volume 724
Pages 17-22
ISSN 0022-328X
Publication year 2013
Published at Department of Chemistry and Molecular Biology
Pages 17-22
Language en
Links dx.doi.org/10.1016/j.jorganchem.201...
Keywords Absolute asymmetric synthesis; Chiral; Copper; Coordination polymer; Conglomerate; Sulfide ligand
Subject categories Chemical Sciences

Abstract

In search for sulfide-containing coordination polymers that crystallize as conglomerates, five new copper(I) complexes with prochiral sulfide ligands have been prepared and characterized by single crystal Xray structure determination. Three unsymmetrical sulfides have been used: phenyl propargyl sulfide (Sprop), allyl methyl sulfide (Sally), and 2,5-dithiahexane (SS). In [CuCl(Sprop)](n) (1), layers are formed via pi-coordination of propargyl groups to copper(I). In [Cu2Br2(Sprop)(4)] (2), discrete dimers form with non-coordinating propargyl groups. In [CuCl(Sally)](n) (3), layers are formed via pi-coordination of allyl groups to copper(I), but disordered Sally ligands are also found. The mesitylcopper complex [Cu-4(Mes)(4)(Sally)(2)] (4) is chiral but discrete. In [Cu-4(Mes)(4)(SS)](n) (5), racemic chains are formed by the SS ligand. Three out of five complexes prepared thus form coordination polymers, and all of the five complexes (1-5) exhibit terminal sulfide ligands that could be oxidized selectively when incorporated in an enantiopure polymer. Unfortunately none of 1-5 crystallized as a conglomerate, but whether this reflects an inherent tendency in this system is too early to say. (C) 2012 Elsevier B. V. All rights reserved.

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