Crystal Structure Of Di­Aqua­Bis­(N,N-Di­Ethyl­Nicotinamide-Κn 1)Bis­(2,4,6-Tri­Methyl­Benzoato-Κo 1)Cobalt(Ii)

Abstract

The CoII atom in the crystal structure of di­aqua­bis­(N,N-di­ethyl­nicotinamide)­bis­(2,4,6-tri­methyl­benzoato)cobalt(II) is located on an inversion centre and exhibits a slightly distorted octa­hedral N2O4 coordination set. Hydrogen bonds of the type O—H⋯O and C—H⋯O lead to the formation of a three-dimensional network., The centrosymmetric mol­ecule in the monomeric title cobalt complex, [Co(C10H11O2)2(C10H14N2O)2(H2O)2], contains two water mol­ecules, two 2,4,6-tri­methyl­benzoate (TMB) ligands and two di­ethyl­nicotinamide (DENA) ligands. All ligands coordinate to the CoII atom in a monodentate fashion. The four O atoms around the CoII atom form a slightly distorted square-planar arrangement, with the distorted octa­hedral coordination sphere completed by two pyridine N atoms of the DENA ligands. The dihedral angle between the planar carboxyl­ate group and the adjacent benzene ring is 84.2 (4)°, while the benzene and pyridine rings are oriented at a dihedral angle of 38.87 (10)°. The water mol­ecules exhibit both intra­molecular (to the non-coordinating carboxyl­ate O atom) and inter­molecular (to the amide carbonyl O atom) O—H⋯O hydrogen bonds. The latter lead to the formation of layers parallel to (100), enclosing R 4 4(32) ring motifs. These layers are further linked via weak C—H⋯O hydrogen bonds, resulting in a three-dimensional network. One of the two ethyl groups of the DENA ligand is disordered over two sets of sites with an occupancy ratio of 0.490 (13):0.510 (13).