title: alpha-Tris(2,4-pentanedionato-kappa(2)O,O')cobalt(III) at 240, 210, 180, 150 and 110 K.
abstract: The crystal structure of the title compound, [Co(C(5)H(7)O(2))(3)], has been investigated by a multi-temperature measurement. In contrast to the isomorphous Al compound, the title compound exists in the studied temperature range as its monoclinic alpha polymorph (space group P2(1)/c) and does not undergo a phase transition. Rigid-body TLS analyses have been performed and the anisotropic thermal expansion tensor alpha(ij) has been determined. The cell axes show a linear expansion behavior with respect to the temperature, but the slope is significantly different. A possible explanation are the different strengths of different intermolecular C-H...O contacts, which run in different crystallographic directions.
authors.affiliation: Bijvoet Center for Biomolecular Research, Crystal and Structural Chemistry, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands. l.vonchrzanowdki@chem.uu.nl
authors.forename: Lars S
authors.initials: LS
authors.lastname: von Chrzanowski
authors.forename: Martin
authors.initials: M
authors.lastname: Lutz
authors.forename: Anthony L
authors.initials: AL
authors.lastname: Spek
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000737:chemistry*; D013696:Temperature
chemical_list: D009942:Organometallic Compounds; C523134:alpha-tris(2,4-pentanedionato-kappa(2)O,O')cobalt(III); D003035:Cobalt