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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Journal Article
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University of Canterbury. Chemistry
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Date
2014
Authors
Hawes, C.S.
Kruger, P.E.
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 ¼ N-methylpyrrolidinone) 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.

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Citation
Hawes, C.S., Kruger, P.E. (2014) Preparation of open and closed forms of the lvt network with Cu(II) complexes of structurally related 1,2-diazole ligands. RSC Advances, 4, pp. 15770–15775.
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ANZSRC fields of research
Field of Research::03 - Chemical Sciences
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