Abstract
The synthesis and physical properties of two dimethylgallium citrate triester complexes are reported. Crystals of bis-[(trimethylcitrato)dimethylgallium(III)] are monoclinic, a = 9.839(1), b = 14.496(1), c = 11.125(1) Å, β = 108.31(1)°, Z = 2, space group P21/c. The structure was solved by conventional heavy-atoms methods and was refined by full-matrix least-squares procedures to R = 0.036 and Rw = 0.037 for 1507 reflections with I ≥ 3σ(I). The structure consists of centrosymmetric dimers in which each citrate ligand is coordinated via the hydroxyl oxygen (bridging) and the C=O oxygen atom of the central ester group, forming five-membered chelate rings. Each Ga atom has irregular trigonal bipyramidal coordination geometry with Ga—O(eq) = 1.950(3), Ga—O(ax) = 2.103(3) and 2.395(3), and Ga—C(eq) = 1.953(5) and 1.947(5) Å.
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