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Issue 24, 2012
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Hydrothermal syntheses, crystal structures and properties of novel quinone biradical and mixed-valence copper coordination polymer with semiquinone radical ligand generated in situ

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Abstract

A novel quinone biradical (1) was hydrothermally synthesized through ZnCl2 mediated decarboxylation and carbon–carbon coupling reactions using the 2-(imidazo[1,2-a]pyridin-2-yl)-2-oxoacetic acid radical. Interestingly, when CuCl2 was used instead of ZnCl2, a new mixed-valence copper coordination polymer (2) with semiquinone radical anion ligand was obtained. The possible formation mechanism of these two compounds is proposed. The EPR and magnetic susceptibility data suggest that 1 is a biradical. The EPR and XPS results support that 2 is a mixed-valence copper coordination polymer. The quinone biradical 1 forms a one-dimensional (1D) columnar stacking chain. The coordination polymer 2 consists of a two-dimensional (2D) layered framework constructed by 1D corrugated double-stranded stair-like inorganic [CuCl]n chains and bridged semiquinone radical anion ligands. 1 and 2 exhibit antiferromagnetic coupling interactions and different luminescent colors.

Graphical abstract: Hydrothermal syntheses, crystal structures and properties of novel quinone biradical and mixed-valence copper coordination polymer with semiquinone radical ligand generated in situ

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Publication details

The article was received on 02 Sep 2012, accepted on 12 Oct 2012 and first published on 15 Oct 2012


Article type: Paper
DOI: 10.1039/C2CE26418H
CrystEngComm, 2012,14, 8620-8625

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    Hydrothermal syntheses, crystal structures and properties of novel quinone biradical and mixed-valence copper coordination polymer with semiquinone radical ligand generated in situ

    G. Yong, Y. Zhang and B. Zhang, CrystEngComm, 2012, 14, 8620
    DOI: 10.1039/C2CE26418H

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