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The dinuclear (R,R)-tartrate nickel(II) complex, [Ni2((R,R)-C4H4O6)2(H2O)4]2·10H2O, has been synthesized and its crystal structure has been determined by single-crystal X-ray diffraction. The structure consists of two independent nickel (R,R)-tartrate units and ten water molecules. Each unit contains two (R,R)-tartrato dianions chelated to two nickel ions (5.049(2) and 4.994(2)A for Ni(1)-Ni(2) and Ni(3)-Ni(4)), with the use of two hydroxyl oxygen atoms and two carboxyl oxygen atoms as donor atoms. The coordination geometry for each nickel ion can be described as octahedral.

Crystal Structure of the Dinuclear (R,R)-tartrato Nickel(II) Complex: [Ni2((R,R)-C4H4O6)2(H2O)4]2 10H2O