Synthesis of an Indium-iminodiacetate Two-dimensional Layer Network with Rhombus Grids

The title compound, [InCl(C4H5NO4)]n, has been synthesized via the hydrothermal method and characterized by IR, elemental analysis, UV-Vis-Nir spectra and single-crystal X-ray diffraction analysis. Single-crystal X-ray analyses show that it is a carboxylate-bridged two-dimensional layer network indium(III) polymer, catena-poly[[chloroindium(III)]-μ-(iminodiacetate к4N,O,O':O':O'']. The crystal is of orthorhombic system, space group Pnma with a = 13.5970(13), b = 8.7671(10), c = 6.0427(5), C4H5ClInNO4, Mr = 281.36, V = 720.33(12)3, Z = 4, Dc = 2.594 g/cm3, F(000) = 536, μ = 3.613 mm-1, R = 0.0245 and wR = 0.0570. The In(III) ion exhibits an approximately octahedral InClNO4 coordination environment, with the two O donor atoms of iminodiacetate and two O atoms belonging to the carboxylate group of two adjacent iminodiacetates occupying the basal positions, and the chlorine ion and one nitrogen atom of iminodiacetate in the apical sites. Carboxylate groups are mutually cis oriented, and each syn-anti carboxylate group bridges two indium(III) ions via two different basal positions, resulting in the formation of a 2-D network with rhombus (4, 4) grids. Each rhombus grid unit is formed from four indium atoms and four iminodiacetate units with the diagonal lengths of 8.767(1) and 6.043(1).