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A low-temperature redetermination of the trinuclear cluster compound described as [Cr 3 (C 2 H 2 ClO 2 ) 6 O(H 2 O) 3 ]NO 3 ·3H 2 O [Glowiak, Kubiak & Jezowska-Trzebiatowska (1977  ▶ ).  Bull. Acad. Pol. Sci. Ser. Sci. Chim.25 , 359–371] shows that the salt is a 3.5-hydrate, [Cr 3 (C 2 H 2 ClO 2 ) 6 O(H 2 O) 3 ]NO 3 ·3.5H 2 O. 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 Cr III  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.

acta crystallographica. section e

Low-temperature redetermination of hexakis(μ-chloroacetato-κ2O:O′)-μ3-oxido-tris[aquachromium(III)] nitrate 3.5-hydrate