Abstract
In the title compound, [Co(C8H4O4)(C3H4N2)3(H2O)2]·H2O, the cisoid angles are in the range 85.59 (5)–93.56 (5)°, while two equal transoid angles deviate significantly from the ideal linear angle, the third being almost linear. One carboxylate group is almost coplanar [1.23 (13)°] with the plane of its parent aromatic ring, although it has one O-atom donor involved in one coordination and one hydrogen bond as acceptor. The other carboxylate group does not coordinate and is rotated out of this plane with a torsional twist of 17.27 (20)°. The coordination neutral entity, based on aqua ligands and two cyclic co-ligands seems, at first sight, monomeric. Strongly tight, via one intramolecular hydrogen bond between aqua and carboxylate O atoms, it brings out a quasi-planar six-membered ring around the CoII atom, turning the CoN3O3 coordination octahedron into a new building block. The rigidity of this feature associated with several hydrogen-bonded arrays yields an extended structure. In the resulting supramolecular packing, a binuclear hydrated CoII assembly, built up from triple strands driven by different heterosynthons, embodies the synergy of coordination, covalent and hydrogen bonds.
Highlights
In the title compound, [Co(C8H4O4)(C3H4N2)3(H2O)2]ÁH2O, the cisoid angles are in the range 85.59 (5)–93.56 (5), while two equal transoid angles deviate significantly from the ideal linear angle, the third being almost linear
One carboxylate group is almost coplanar [1.23 (13)] with the plane of its parent aromatic ring, it has one O-atom donor involved in one coordination and one hydrogen bond as acceptor
Via one intramolecular hydrogen bond between aqua and carboxylate O atoms, it brings out a quasi-planar six-membered ring around the CoII atom, turning the CoN3O3 coordination octahedron into a new building block
Summary
Intra- and supramolecular interactions in cis,mer-diaquatris(1H-imidazole-jN3)(terephthalato-jO)cobalt(II) monohydrate. One carboxylate group is almost coplanar [1.23 (13)] with the plane of its parent aromatic ring, it has one O-atom donor involved in one coordination and one hydrogen bond as acceptor. Via one intramolecular hydrogen bond between aqua and carboxylate O atoms, it brings out a quasi-planar six-membered ring around the CoII atom, turning the CoN3O3 coordination octahedron into a new building block. The rigidity of this feature associated with several hydrogen-bonded arrays yields an extended structure. In the resulting supramolecular packing, a binuclear hydrated CoII assembly, built up from triple strands driven by different heterosynthons, embodies the synergy of coordination, covalent and hydrogen bonds
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