The crystal structure of a basic chromium acetate compound, [OCr3(CH3COO)6.3H2O]+Cl−.6H2O, having feeble paramagnetism

Abstract

The crystal structure of [OCr3(CH3COO)6.3H20]+C1 -. 6H20 has been determined from three-dimensional diffractometer data using Cu Ke radiation. The configuration of the complex cation consists of three chromium atoms linked to a central oxygen atom in a planar configuration. Each chromium atom is coordinated octahedrally by the central oxygen atom, one from each of four acetate groups and a water molecule. The acetate groups link the vertices of the three octahedra in the complex cation. The anions and those water molecules not included in the cations are disordered and lie in channels along the twofold axes. Their structure is ill-defined, but a reasonable model can be presented in which the cations are linked by a system of hydrogen bonds into zigzag layer3 perpendicular to the c axis.

Chemical and Physical Properties of Triangular Bridged Metal Complexes

“…Finally, the complex ions themselves are reported to have a curious departure from D3h symmetry, each acetate group having one long and one short C-0 bond, differing by 0.07 A. Hydrogen bonding from coordinated water molecules has been suggested, in which case the structure would approximate to [ Cr30(00CCH3)3(HOOCCH,)? (OH)3] + , or some intermediate form (35).…”

Crystal and molecular structures of trinuclear rhodium(III) complexes: trans-μ3-oxo-tris[bis(acetato)aquarhodium(III)] perchlorate dihydrate and monohydrate

“…Uemura, Spencer & Wilkinson (1973) obtained an Rh m complex of formula [Rh30(CH3COO)6(H20)3]CIOa.2H20 by ozonization of the binuclear complex in acetic acid. On the basis of electronic, IR and NMR spectra and from the results of electrochemical reduction, these authors have shown that the complex contains an M30 group, found earlier for Cr (Figgis & Robertson, 1965;Chang & Jeffrey, 1970), Mn (Hessel & Romers, 1969), Fe (Figgis & Robertson, 1965;Anzenhofer & De Boer, 1969) and Ru (Cotton & Norman, 1972) compounds. Baranovski, Mazo & Dikareva (1971) prepared the same compound by reacting Rh H1 chloride monohydrate with Ag acetate.…”

N2 Laser‐excited luminescence of antiferromagnetically coupled trinuclear chromium(III) complexes

“…This crystal has not shown any type of distortion in the luminescence measurements. Therefore, we can conclude that the distortion was caused by water molecules disordered within the hydrogen-bonded channels [8]. Further, this anhydrous crystal is suggested to be the best model to study exchange interactions in trinuclear clusters because the single luminescence bands supports the one-cluster-site model having a triangular cluster configuration.…”