Crystal structure of catena-poly[[[tetraaquacobalt(II)]-μ2-1,5-dihydroxynaphthalene-2,6-dicarboxylato] dimethylformamide disolvate]

Abstract

The asymmetric unit of the title compound, {[Co(C12H6O6)(H2O)4]·2C3H7NO}n or {[Co(H2dondc)(H2O)4]·2DMF}n, comprises half of a CoII ion, half of a 1,5-dihydroxynaphthalene-2,6-dicarboxylate dianion (H2dondc2−), two water molecules and a dimethylformamide (DMF) molecule. The CoII ion, which is located on a crystallographic inversion center, exhibits a distorted six-coordinated octahedral geometry with two oxygen atoms of the H2dondc2− ligand and four oxygen atoms of the water molecules. The carboxylate group is almost coplanar with the naphthalene moiety and shows monodentate coordination to the CoII ion. The CoII ions are bridged by the H2dondc2− ligand to form a one-dimensional chain. The hydroxy groups of the ligand have intra-chain hydrogen bonding interactions with coordinated water molecules. The coordinated water molecules exhibit not only intra-chain hydrogen bonding interactions, but also inter-chain hydrogen-bonding interactions. The chains are connected by inter-chain hydrogen-bonding interactions and are arranged in parallel to form a two-dimensional network. The chains are further connected by inter-chain hydrogen-bonding interactions via the DMF molecules and C—H...π interactions to give a three-dimensional network.

Keywords

• cobalt
• hydrogen bonding
• c—h...π interaction
• dihydroxy-naphthalenedicarboxylate
• crystal structure