Tetraaquabis(6-chloropyridine-3-carboxylato-κO)cobalt(II) tetrahydrate

Abstract

In the title compound, [Co(C6H3ClNO2)2(H2O)4]·4H2O, the CoII cation is located on an inversion center and is coordinated by four water mol­ecules and two 6-chloro­pyridine-3-carboxyl­ate anions in a slightly distorted octa­hedral geometry. In the crystal, complex mol­ecules and lattice water mol­ecules are linked by O—H⋯O and O—H⋯N hydrogen bonds into a three-dimensional network.

Self‐Assembly of Cobalt(II) Coordination Polymers with Differently Halosubstituted Nicotinate Ligands and 4,4’‐Bipyridine – The Effect of the Halosubstituent Positions on Polymer Types

“…The octahedral coordination environments around the cobalt(II) ions in 1 and 2 are only slightly distorted, as is evident from the angles for the cis pairs of the ligating atoms (Table S1 in the supporting information). The CoÀ O (carboxylate O atom) bond lengths in 1 are comparable to those seen in the related cobalt(II) complexes with nicotinate ligands, [18,23,[27][28][29][30] while the CoÀ N bond lengths could be compared to those reported for cobalt(II) complexes containing bridging 4,4'-bipyridine ligands. [13] The CoÀ O and CoÀ N bond lengths in the {[Co(4,4'bpy)(H 2 O) 4 ] 2 + } n cation of 2 are identical as in the other structures containing this cation, [13] while the CoÀ O and CoÀ N bond lengths in the [Co(5-Br-nic) 4 (H 2 O) 2 ] 2À anion of 2 are comparable to those seen in the related cobalt(II) complexes with nicotinate ligands.…”

“…[13] The CoÀ O and CoÀ N bond lengths in the {[Co(4,4'bpy)(H 2 O) 4 ] 2 + } n cation of 2 are identical as in the other structures containing this cation, [13] while the CoÀ O and CoÀ N bond lengths in the [Co(5-Br-nic) 4 (H 2 O) 2 ] 2À anion of 2 are comparable to those seen in the related cobalt(II) complexes with nicotinate ligands. [13,18,23,[27][28][29][30] The extended structures of 1 and 2 mainly feature strong OÀ H•••O and OÀ H•••N hydrogen bonds, weak CÀ H•••O hydrogen bonds (Table S2 in the supporting information) and π-π interactions. The strong hydrogen bonds link the polymeric chains of 1 and the lattice water molecules into an infinite three-dimensional network.…”