Glowiak, Tadeusz and Kozlowski, Henryk and Strinna Erre, Liliana and Micera, Giovanni (1996) Crystal structure of mu3-oxo-esakis(mu2-acetate) triaquatrichromium (III) 2,6-dihydroxybenzoate dihydrate. Inorganica Chimica Acta, Vol. 248 (1), p. 99-102. ISSN 0020-1693. Article.
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The compound [Cr3(μ2-CH3COO)6(μ3-O)(H2O)3]DHB·2H2O (DHB = 2,6-dihydroxybenzoate(-1)), as characterized by single crystal X-ray analysis and spectroscopy, is described. The compound crystallizes in the monoclinic space group Cc with a = 14.122(3), B = 15.137(4), C = 14.952(3) Å, β = 99.70(3)°, Z = 4. The structure of the complex consists of the trimetallic cage common to 'basic' acetates of Cr(III), Fe(III) and Rh(III), where three metal ions lie at the corners of a nearly equilateral triangle of side ~ 3.3 Å, the center being occupied by a triply-bridging oxygen. The chromium coordination is compared with those found in related complexes. The DHB anion is anchored to the trichromium moiety through bonding between the carboxylate group and a metal-bound water molecule.
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