title: Directed anisotropy in bis(acetato-kappa2O,O')diaquazinc(II) at 110 and 250 K.
abstract: The molecule of the title compound, [Zn(C(2)H(3)O(2))(2)(H(2)O)(2)], is located on a twofold axis in the crystal structure. The displacement parameters and the thermal expansion of the crystal show significant anisotropy. This is explained by the two-dimensional hydrogen-bonded structure, with only very weak interactions perpendicular to it. Besides the overall molecular motion, there are internal vibrations, which cause the Zn-O(carboxylate) bonds to fail the Hirshfeld rigid-bond test. It is shown that this can be interpreted in terms of the steric strain in the four-membered chelate ring due to the bidentate carboxylate coordination.
authors.affiliation: Bijvoet Center for Biomolecular Research, Crystal and Structural Chemistry, Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands. m.lutz@uu.nl
authors.forename: Martin
authors.initials: M
authors.lastname: Lutz
authors.forename: Anthony L
authors.initials: AL
authors.lastname: Spek
mesh_terms: D016880:Anisotropy; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000737:chemistry*; D017967:Zinc Compounds / Q000737:chemistry
chemical_list: D009942:Organometallic Compounds; D017967:Zinc Compounds; C539849:bis(acetato-kappa2O,O')diaquazinc(II)