Synthesis, characterization and crystal structure of Indium(ш) binuclear complex containing pyridine-2,3 dicarboxylic acid

Abstract

The novel centrosymmetric complex, [In2(pydc)2(pydcH)2(H2O)2] • 2H2O (1), (pydcH2 = 2,3-pyridinedicarboxylic acid) was<br><br>synthesized and thoroughly characterized using elemental analysis, IR, 1H NMR spectroscopy and single crystal X-ray diffraction. All of<br><br>obtained data via routine methods are in agreement with single crystal X-ray diffraction information. Compound 1 crystallized in the<br><br>triclinic system with space group Pī with two molecules per unit cell. Each In(III) is six-coordinated with InN2O4 bound set as distorted<br><br>octahedral geometry. PydcH2 with capability hydrogen donating and versatile coordination mode appears in this complex as both mono<br><br>depronotaed, bidenated ligand and doubly protonated-tridentate one. Each tridentate ligands is coordinated to In(III) through two O<br><br>atoms and one N atom and play as bridged role between two In(III) ions. The distance between two In(III) is about 6.527 Å and size of<br><br>resultant hole within binuclear complex is around 3.195×5.567Å2. In the title compound, different types of hydrogen bonds and<br><br>electrostatic interaction play important roles in stabilizing the corresponding lattice and assemble to 3-D supramoleculer network.