Abstract
The title compound, {[Co3(C6H4NO2)2(C8H3NO6)2(H2O)2]·4H2O}n, exhibits a two-dimensional layer-like structure in which the CoII ions exhibit two kinds of coordination geometries. One nearly octahedral CoII ion with crystallographic inversion symmetry is coordinated to six carboxylate O atoms from four bridging 5-nitroisophthalate (NIPH) ligands and two isonicotinate (IN) anions, while the other type of CoII ion binds with one N atom and one carboxylate O atom from two IN anions, two carboxylate O atoms from two different NIPH anions and one ligated water molecule, displaying a distorted square-pyramidal coordination geometry. Three adjacent CoII ions are bridged by six carboxylate groups from four NIPH ligands and two IN anions to form a linear trinuclear secondary building unit (SBU). Every trinuclear SBU is linked to its nearest neighbours in the ab plane, resulting in a two-dimensional layer-like structure perpendicular to the c axis. Along the a-axis direction neighbouring molecules are connected through carboxylate and pyridyl units of the IN anions, along the b axis through carboxylate groups of the NIPH ligands. The H atoms of one free water molecule are disordered in the crystal in a 1:1 ratio. Typical O—H⋯O hydrogen bonds are observed in the lattice, which include the following contacts: (a) between coordinated water molecules and carboxylate O atoms of the NIPH anions, (b) between lattice water molecules and carboxylate O atoms of the NIPH anions, and (c) between coordinated and lattice water molecules. These intermolecular hydrogen bonds connect the two-dimensional layers to form a three-dimensional supramolecular structure.
Highlights
The title compound, {[Co3(C6H4NO2)2(C8H3NO6)2(H2O)2]4H2O}n, exhibits a two-dimensional layer-like structure in which the CoII ions exhibit two kinds of coordination geometries
One nearly octahedral CoII ion with crystallographic inversion symmetry is coordinated to six carboxylate
Three adjacent CoII ions are bridged by six carboxylate groups from four NIPH ligands and two IN
Summary
Natarajan & Mahata (2009); Zang et al (2006). For complexes with isonicotinate, see: Amo-Ochoa et al (2010). (2008); Luo et al (2003); Wang et al (2009)
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