catena-Poly[[gallium(III)-bis[μ-D/l-tartrato(2−)]-gallium(III)-di-μ-hydroxido] dihydrate]

Abstract

In the title compound, {[Ga2(C4H4O6)2(OH)2]·2H2O}n, the GaIII atom is located on a twofold rotation axis and is six-coordinated by two O atoms from bridging hydroxide groups and four O atoms from two symmetry-related tartrate units in a slightly distorted octahedral environment. Each tartrate unit binds to two GaIII atoms as a bis-chelating bridging ligand by two pairs of hydroxide groups and an O atom of a carboxylate group. The GaIII atoms are linked by two bridging hydroxide groups located on mirror planes. In this way a chain along the c axis is formed. Free water molecules on mirror planes are located between the chains and hold them together through hydrogen-bonding interactions, with O...O distances in the range 2.509 (3)–3.179 (5) Å.