Abstract
The title coordination polymer, {[Co2(C15H7O7)(OH)(C14H14N4)]·0.25H2O}n, was synthesized under hydrothermal conditions. The asymmetric unit contains two Co2+ ions, one L 3− anion originating from 5-(4-carboxyphenoxy)isophthalic acid (H3 L), one OH− ligand, one 1,4-bis[(1H-imidazol-l-yl)methyl]benzene (bix) ligand and one disordered lattice water molecule (occupancy 0.25). The two Co2+ ions have different environments. One has an octahedral O4N2 coordination sphere, defined by four O atoms from three carboxylate groups and one OH− ligand, and two N atoms from two symmetry-related bix ligands. The other has a trigonal-bipyramidal O5 coordination sphere resulting from three carboxylate groups and two OH− ligands. The dihedral angles between the two benzene rings in the L 3− ligand and between the benzene ring and the two imidazole rings in the bix ligand are 67.05 (15), 75.27 (17) and 82.05 (17)°, respectively. Four neighbouring Co2+ ions are linked by six carboxylate groups and two μ 3-OH ligands, forming a butterfly-shaped secondary building unit (SBU). These SBUs are connected by L 3− anions into layers parallel to (1-10). Adjacent layers are cross-linked by the bix ligands, forming a three-dimensional framework that has a bimodal (3,8)-connected tfz-d topology. The disordered lattice water molecule is located in the voids of the framework and has O⋯O and O⋯N contacts of 2.81 (2) and 2.95 (2) Å, suggesting medium-strength hydrogen bonds. The title compound may be a good candidate for artificial eye lenses.
Highlights
L3 anion originating from 5-(4-carboxyphenoxy)isophthalic acid (H3L), one OH ligand, one 1,4-bis[(1H-imidazol-lyl)methyl]benzene ligand and one disordered lattice water molecule
The other has a trigonalbipyramidal O5 coordination sphere resulting from three carboxylate groups and two OH ligands
The dihedral angles between the two benzene rings in the L3 ligand and between the benzene ring and the two imidazole rings in the bix ligand are 67.05 (15), 75.27 (17) and 82.05 (17), respectively
Summary
L3 anion originating from 5-(4-carboxyphenoxy)isophthalic acid (H3L), one OH ligand, one 1,4-bis[(1H-imidazol-lyl)methyl]benzene (bix) ligand and one disordered lattice water molecule (occupancy 0.25). For general background to the properties and applications of compounds with metal-organic framework structures (MOFs), see: Batten & Robson (1998); Farrusseng et al (2009); Iremonger et al (2013); Kreno et al (2012); Kurmoo (2009); Song et al (2013); Su et al (2012); Wong et al (2006). For topological analysis of crystal structures, see: Blatov et al.
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