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Cooperative Hydrogen-Bonding Effects in a Water Square:  A Single-Crystal Neutron and Partial Atomic Charges and Hardness Analysis Study

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    Cooperative Hydrogen-Bonding Effects in a Water Square:  A Single-Crystal Neutron and Partial Atomic Charges and Hardness Analysis Study
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    Contribution from the Department of Chemistry, University of Durham, South Road, Durham DH1 3LE, U.K., Institut Le Bel, Universite Louis Pasteur, 4, Rue Blaise Pascal, 67070 Strasbourg Cedex, France, and Institut Laue-Langevin, B.P. 156, 38042 Grenoble Cedex 9, France
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    Cite this: J. Am. Chem. Soc. 2005, 127, 31, 11063–11074
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    https://doi.org/10.1021/ja052081a
    Published July 16, 2005
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    Abstract

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    Four isomorphous complexes of formula [M(L)4(H2O)2]SO4·2H2O (M = Co, 1a; Ni, 1b; Cu, 1c; Zn, 1d) have been isolated and characterized by single-crystal X-ray diffraction and neutron diffraction using the quasi-Laue diffractometer VIVALDI at the Institut Laue-Langevin as well as by thermogravimetric analysis. The structures contain a discrete, strongly hydrogen-bonded water tetramer which causes a significant distortion of the metal coordination sphere in each case. Partial atomic charges and hardness analysis (PACHA) calculations reveal that the shortest hydrogen bonds are not the strongest in this constrained, cyclic solid-state structure and show that the distortion at the metal center is caused by the drive to maintain the integrity of the water tetramer. The system undergoes a disorder−order transition on slow cooling that provides insight into the nature of communication between water squares.

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     University of Durham.

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     Universite Louis Pasteur.

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     Institut Laue-Langevin.

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    In papers with more than one author, the asterisk indicates the name of the author to whom inquiries about the paper should be addressed.

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    Details of the X-ray and neutron crystal structures of 1a−d at all temperatures (CIF). This material is available free of charge via the Internet at http://pubs.acs.org.

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    Journal of the American Chemical Society

    Cite this: J. Am. Chem. Soc. 2005, 127, 31, 11063–11074
    Click to copy citationCitation copied!
    https://doi.org/10.1021/ja052081a
    Published July 16, 2005
    Copyright © 2005 American Chemical Society
    Request reuse permissions

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