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Issue 23, 2015
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Interplay of ligand chirality and metal configuration in mononuclear complexes and in a coordination polymer of Cr(III)

Ai Wang,a  Carina Merkensa  and  Ulli Englert*a 
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* Corresponding authors

a Institute of Inorganic Chemistry, RWTH Aachen University, Aachen, Germany
E-mail: ullrich.englert@ac.rwth-aachen.de
Fax: +49 241 8092 288
Tel: +49 241 809 4666

Abstract

In order to investigate the influence of ligand chirality on the configuration of the coordinated metal, five pseudooctahedral Cr(III) complexes with one or two chelating R,R-1,2-diaminocyclohexane ligands have been synthesized. The mononuclear complexes [Cr(R,R-chxn)2Cl(DMSO)]Cl2, [Cr(R,R-chxn)2Cl2]Cl, [Cr(acacCN)(R,R-chxn)2](NO3)2, [Cr(acacCN)2(R,R-chxn)]NO3, [Cr(acacCN)2(R,R-chxn)]PF6. (R,R-chxn = R,R-1,2-diaminocyclohexane; acacCN = deprotonated 3-cyanoacetylacetone and DMSO = dimethyl sulfoxide) have been obtained as crystalline solids, mostly solvates, and the potential chirality transfer from the enantiopure ligand to the configuration at the Cr(III) center has been investigated. The cationic complex [Cr(acacCN)2(R,R-chxn)]+ has been synthesized as exclusively Λ configured at the metal. In this complex, the dangling nitrile groups of the ditopic acacCN ligands may coordinate to Ag(I): the chiral-at-metal building block has thus been converted to the 2D network Ag[Cr(acacCN)2(R,R-chxn)]2(PF6)3 under retention of the stereochemistry at Cr(III). With respect to topology, the polycations in this mixed-metal coordination polymer correspond to two interpenetrated {4,4} nets.

Graphical abstract: Interplay of ligand chirality and metal configuration in mononuclear complexes and in a coordination polymer of Cr(iii)

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Publication details

The article was received on 23 Mar 2015, accepted on 05 May 2015 and first published on 05 May 2015


Article type: Paper
DOI: 10.1039/C5CE00586H
Author version available: Download Author version (PDF)
Citation: CrystEngComm, 2015,17, 4293-4300
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    Interplay of ligand chirality and metal configuration in mononuclear complexes and in a coordination polymer of Cr(III)

    A. Wang, C. Merkens and U. Englert, CrystEngComm, 2015, 17, 4293
    DOI: 10.1039/C5CE00586H

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