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Classical hydrogen bonding and weaker C-H⋯O interactions in complexes of uracil-5-carboxylic acid with the alkali metals Na-Cs

Lookup NU author(s): Gary Nichol, Emeritus Professor Bill CleggORCiD


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Reaction of uracil-5-carboxylic acid with M2CO3 or M(OH) (M = Na-Cs) gave five new polymeric coordination compounds: [Na(C 5H3N2O4)(H2O)] ∞ (1); [K(C5H3N2O 4)(C5H4N2O4)] ∞ (2); [Rb{H(C5H3N2O 4)2}·2H2O]∞ (3); [Rb(C5H3N2O4)(H2O)] ∞ (4); [Cs{H(C5H3N2O 4)2}(H2O)2]∞ (5). Characterisation by single-crystal X-ray diffraction using both standard laboratory equipment and high-flux synchrotron radiation revealed that very different hydrogen bonding networks are formed in each case. Hydrogen-bonded chains (1), sheets (2 and 5) and tapes (3 and 4) are all found in these compounds. All except 3 additionally contain C-H⋯O interactions as an integral part of the hydrogen bonding motifs formed. Compounds 3 and 5 also feature centrosymmetric hydrogen bonds as a result of partial deprotonation, whereby a single hydrogen atom is shared equally between two carboxylate groups. © 2005 Elsevier Ltd. All rights reserved.

Publication metadata

Author(s): Nichol GS, Clegg W

Publication type: Article

Publication status: Published

Journal: Polyhedron

Year: 2006

Volume: 25

Issue: 4

Pages: 1043-1056

ISSN (print): 0277-5387

ISSN (electronic): 1873-3719

Publisher: Pergamon


DOI: 10.1016/j.poly.2005.12.013


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