| Hexakis(urea-κO)zinc(II) dinitrate at 110 and 250 K: uniaxial negative thermal expansion. | |
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MedLine Citation:
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PMID: 21285496 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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The crystal structure of the title compound, [Zn{CO(NH(2))(2)}(6)](NO(3))(2), has been determined at 110 and 250 K. The structure is stabilized by 12 individual hydrogen bonds, both intra- and intermolecular. Analysis of the thermal expansion tensor, based on unit cells determined over a temperature range of 180 K, shows uniaxial compression in the direction of the b axis during warming. The hydrogen bonds form layers perpendicular to this axis and these layers are connected by coordinative bonds parallel to the axis. As expected, the intermolecular hydrogen bonds expand during warming. Surprisingly, the coordinative bonds contract, accompanied by changes in the O-Zn-O angles. Overall, this behaviour can be described as an accordion-like effect. |
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Authors:
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Stef Smeets; Martin Lutz |
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Publication Detail:
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Type: Journal Article Date: 2011-01-18 |
Journal Detail:
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Title: Acta crystallographica. Section C, Crystal structure communications Volume: 67 ISSN: 1600-5759 ISO Abbreviation: Acta Crystallogr C Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-02-02 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8305826 Medline TA: Acta Crystallogr C Country: Denmark |
Other Details:
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Languages: eng Pagination: m50-5 Citation Subset: IM |
Affiliation:
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Bijvoet Center for Biomolecular Research, Crystal and Structural Chemistry, Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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