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Issue 30, 2014
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Preparation of open and closed forms of the lvt network with Cu(ii) complexes of structurally related 1,2-diazole ligands

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Abstract

Reported here are the synthesis and structural characterisation of two topologically related coordination polymers: [Cu(L1)(CH3CONH2)], 1, and [Cu(L2)(NMP)]·0.5NMP·0.5H2O, 2, (NMP = N-methyl-pyrrolidinone) prepared from 1H-indazole-3-carboxylic acid, H2L1, and 1H-pyrazole-3-carboxylic acid, H2L2, respectively. Both 1 and 2 crystallise in the tetragonal space group I41/a and form 3-dimensional coordination polymers described by the lvt topology, in which [Cu2L2] dimers form four-connected nodes linked through carboxylate groups. Within 1 the presence of a Cu-bound acetamide molecule (formed in situ by the solvothermal hydration of acetonitrile) propagates hydrogen bonding between dimer units that, combined with the steric bulk of the indazole fragment, yield a closed (non-porous) framework. In 2, however, Cu-bound NMP, which does not participate in hydrogen bonding, coupled with the less bulky nature of the pyrazole-backbone, gives rise to an open framework of an otherwise isostructural network.

Graphical abstract: Preparation of open and closed forms of the lvt network with Cu(ii) complexes of structurally related 1,2-diazole ligands

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Publication details

The article was received on 12 Mar 2014, accepted on 23 Mar 2014 and first published on 24 Mar 2014


Article type: Paper
DOI: 10.1039/C4RA02147A
RSC Adv., 2014,4, 15770-15775

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    Preparation of open and closed forms of the lvt network with Cu(II) complexes of structurally related 1,2-diazole ligands

    C. S. Hawes and P. E. Kruger, RSC Adv., 2014, 4, 15770
    DOI: 10.1039/C4RA02147A

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