Abstract
A new coordination compound crystal of calcium with malic acid is prepared by gel aided solution growth. Single crystal X-ray diffraction studies revealed that the structural formula of the compound is Ca(C 4H 4O 5) 2·2H 2O. It crystallizes in the monoclinic system with space group C2/ c, Z = 4, with unit cell parameters a = 15.916(9) Å, b = 5.886(3) Å, c = 13.046(6) Å and β = 90.678(4)°. Data were collected by oscillation method and full-matrix least squares refinement was applied to the model converging to final R indices R 1 = 0.0416 and ωR 2 = 0.1255. Compound forms a layer-type polymeric structure, stabilized by intermolecular hydrogen bonding. Ca 2+ is eight-fold coordinated. Malate is coordinated to Ca 2+ tridendate–bidendate through two carboxylates and monodendate through oxygen atom of the hydroxyl group. Thermal behavior investigated using TG and DTA studies is in conformity with the proposed structure.
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