Abstract

Single crystals of nickel tartrate hemi-pentahydrate, NiC₄H₄O₆·2.5H₂O, were grown by the gel method using silica gels. The crystal structure was determined by the single-crystal X-ray diffraction method. Its structure was orthorhombic with space group P2₁2₁2₁ and lattice constants a = 7.8578(3) Å, b = 11.0988(5) Å, and c = 18.0529(8) Å, and consisted of slightly distorted NiO₆ octahedra, C₄H₄O₆ and H₂O molecules, C₄H₄O₆–Ni–C₄H₄O₆ chains containing H₂O molecules, and O–H···O hydrogen-bonded frameworks between adjacent molecules. The C₄H₄O₆ molecules contained both single and double C–O bonds, and single C–C bonds, similar to other tartrate compounds. We discussed the differences in the chemical formulae and structures of tartrate compounds induced by different cations of the first transition metal series.

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