Abstract
The centrosymmetric mol-ecule in the monomeric title cobalt complex, [Co(C10H11O2)2(C10H14N2O)2(H2O)2], contains two water mol-ecules, two 2,4,6-tri-methyl-benzoate (TMB) ligands and two di-ethyl-nicotinamide (DENA) ligands. All ligands coordinate to the Co(II) atom in a monodentate fashion. The four O atoms around the Co(II) atom form a slightly distorted square-planar arrangement, with the distorted octa-hedral coordination sphere completed by two pyridine N atoms of the DENA ligands. The dihedral angle between the planar carboxyl-ate 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 mol-ecules exhibit both intra-molecular (to the non-coordinating carboxyl-ate O atom) and inter-molecular (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).
Highlights
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)
Summary
N,N-Diethylnicotinamide (DENA), a nicotinic acid derivative, is an important respiratory stimulant (Bigoli et al, 1972). The structures of some complexes obtained from the reactions of transition metal(II) ions with DENA as ligand, e.g. In complex (V), DENA is a bidentate ligand, while in complexes (III), (IV), (VI) and (VII), DENA is a monodentate ligand. When pyridine or its derivatives are used instead of water molecules, the resulting structure is completely different (Catterick et al, 1974). CoII-containing compound with 2,4,6-trimethylbenzoate (TMB) and DENA ligands, namely diaquabis(N,Ndiethylnicotinamide-N1)bis(2,4,6-trimethylbenzoato-O1)cobalt(II), [Co(DENA)2(TMB)2(H2O)2], and report its crystal structure
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