Abstract
A low-temperature redetermination of the trinuclear cluster compound described as [Cr3(C2H2ClO2)6O(H2O)3]NO3·3H2O [Glowiak, Kubiak & Jezowska-Trzebiatowska (1977 ▶). Bull. Acad. Pol. Sci. Ser. Sci. Chim. 25, 359–371] shows that the salt is a 3.5-hydrate, [Cr3(C2H2ClO2)6O(H2O)3]NO3·3.5H2O. The trinuclear cluster cation is disordered in four of the six monochloroacetate groups. One is disordered over two positions in respect of the chloromethyl atoms (occupancy ratio 0.50:0.50); another is disordered over three positions in respect of the chloromethyl atoms (occupancy ratio 0.50:0.37:0.13) whereas two are disordered over two positions in respect of the Cl atoms only (occupancy ratios 0.84:0.16 and 0.60:0.40). Of the four independent uncoordinated water molecules, one has an occupancy factor of 0.5. The trinuclear cation has an oxido O atom that is connected to three water-coordinated CrIII atoms, the three metal atoms forming the points of an equilateral triangle. Six carboxylate groups each chelate a Cr—O—Cr fragment. The cations, anions and uncoordinated water molecules are linked by hydrogen bonds.
Highlights
A low-temperature redetermination of the trinuclear cluster compound described as [Cr3(C2H2ClO2)6O(H2O)3]NO3Á3H2O [Glowiak, Kubiak & Jezowska-Trzebiatowska (1977)
One is disordered over two positions in respect of the chloromethyl atoms; another is disordered over three positions in respect of the chloromethyl atoms whereas two are disordered over two positions in respect of the Cl atoms only
The trinuclear cation has an oxido O atom that is connected to three watercoordinated CrIII atoms, the three metal atoms forming the points of an equilateral triangle
Summary
A low-temperature redetermination of the trinuclear cluster compound described as [Cr3(C2H2ClO2)6O(H2O)3]NO3Á3H2O [Glowiak, Kubiak & Jezowska-Trzebiatowska (1977). H atoms treated by a mixture of independent and constrained refinement The cations, anions and uncoordinated water molecules are linked by hydrogen bonds.
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