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Issue 8, 2010
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Coordinatively polymeric and monomeric bismuth(iii) complexes with pyridine carboxylic acids

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Abstract

Three crystalline compounds, [Bi(2-O2C–C5H4N)3]n (1), {Bi[(2,6-O2C)2C5H3N)][(2-HO2C-6-O2C)C5H3N]·H2O}n (2) and Bi(O2CC9H6N)2(O3N)(O2CC9H6NH)·2H2O (3) have been prepared by simple reactions in aqueous medium using the readily available bismuth nitrate and the corresponding acids, picolinic acid, dipicolinic acid and quinaldic acid. While 1 and 2 are coordination polymers with bismuth in tricapped trigonal prismatic and dodecahedral environments, compound 3 is a monomeric species with dodecahedral geometry at bismuth. Compound 1 represents a second crystalline form of a recently reported structure with subtle differences in bond parameters, and highlights the flexibility in structural motifs during crystallization. Compound 2 involves skeletons with dimeric [Bi2O2] and trimeric [BiOCOBiOBiOCO] moieties. In 3, while the N-protonated carboxylate forms a four-membered chelate ring with bismuth, the other two carboxylates form five-membered ring chelates with the nitrate accounting for the remaining two sites again as a chelate. TGA studies are consistent with the presence of non-coordinated water in 2 and 3. Compounds 1 and 2, although insoluble in most of the organic solvents and water, are readily soluble in dilute hydrochloric acid.

Graphical abstract: Coordinatively polymeric and monomeric bismuth(iii) complexes with pyridine carboxylic acids

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Article information


Submitted
07 Oct 2009
Accepted
19 Nov 2009
First published
24 Dec 2009

Dalton Trans., 2010,39, 1935-1940
Article type
Paper

Coordinatively polymeric and monomeric bismuth(III) complexes with pyridine carboxylic acids

O. Anjaneyulu, T. K. Prasad and K. C. K. Swamy, Dalton Trans., 2010, 39, 1935
DOI: 10.1039/B920775A

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