Acta Crystallographica Section C

Crystal Structure Communications

Volume 63, Part 8 (August 2007)

metal-organic compounds

bg3044 scheme

Acta Cryst. (2007). C63, m377-m382 [ doi:10.1107/S0108270107033823 ]

-Tris(2,4-pentanedionato-²O,O')chromium(III) at 290 and 110 K: a new phase at 110 K

L. S. von Chrzanowski, M. Lutz and A. L. Spek

Abstract: The crystal structure of the title compound, [Cr(C₅H₇O₂)₃], has been determined at 290 and 110 K to provide information on thermal vibrations and disorder. The [alpha] polymorph at room temperature has been reported [Morosin (1965). Acta Cryst. 19, 131-137]. The reinvestigation of this structure, presented here, indicates the presence of weak uninterpretable supercell reflections together with disorder streaks. The discussed structure can thus be considered as an average structure. After cooling to 110 K, a new [delta] polymorph was found, which is a superstructure of the [alpha] polymorph. The space group remains P2₁/c and the phase transition can therefore be considered as klassengleich. The unit-cell volume increases by a factor of six, resulting in six independent molecules in the asymmetric unit.

Formula: [Cr(C₅H₇O₂)₃]


	Structure factor file (CIF format) (192.4 kbytes) [ doi:10.1107/S0108270107033823/bg3044Iasup2.hkl ] Contains datablock Ia

	Structure factor file (CIF format) (911.4 kbytes) [ doi:10.1107/S0108270107033823/bg3044Ibsup3.hkl ] Contains datablock Ib

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