Tetraaquabis(isonicotinamide-κN1)cobalt(II) bis(4-formylbenzoate) dihydrate

Tuncer Hökelek,Filiz Yılmaz,Hacali Necefoğlu,Barış Tercan,Mustafa Sertçelik

doi:10.1107/s1600536809033200

Abstract

The asymmetric unit of the crystal structure of the title complex, [Co(C6H6N2O)2(H2O)4](C8H5O3)2·2H2O, contains one-half of the complex cation with the CoII ion located on an inversion center, a 4-formylbenzoate (FB) counter-anion and an uncoordinated water molecule. The four O atoms in the equatorial plane around the CoII ion form a slightly distorted square-planar arrangement with an average Co—O bond length of 2.086 Å; the slightly distorted octahedral coordination is completed by the two N atoms of the isonicotinamide (INA) ligands at a slightly longer distance [2.1603 (14) Å] in the axial positions. The dihedral angle between the carboxylate group and the attached benzene ring is 5.93 (13)°, while the pyridine and benzene rings are oriented at a dihedral angle of 3.09 (6)°. In the crystal structure, O—H⋯O, N—H⋯O and C—H⋯O hydrogen bonds link the molecules into a three-dimensional network. π–π Contacts between the benzene and pyridine rings [centroid–centroid distance = 3.758 (1) Å] may further stabilize the crystal structure.

Highlights

The asymmetric unit of the crystal structure of the title complex, [Co(C6H6N2O)2(H2O)4](C8H5O3)2Á2H2O, contains one-half of the complex cation with the CoII ion located on an inversion center, a 4-formylbenzoate (FB) counter-anion and an uncoordinated water molecule
The four O atoms in the equatorial plane around the CoII ion form a slightly distorted square-planar arrangement with an average Co—O bond length of 2.086 A ; the slightly distorted octahedral coordination is completed by the two N atoms of the isonicotinamide (INA) ligands at a slightly longer distance [2.1603 (14) A ] in the axial positions
The dihedral angle between the carboxylate group and the attached benzene ring is 5.93 (13), while the pyridine and benzene rings are oriented at a dihedral angle of 3.09 (6)

Summary

Structure Reports Online

The asymmetric unit of the crystal structure of the title complex, [Co(C6H6N2O)2(H2O)4](C8H5O3)2Á2H2O, contains one-half of the complex cation with the CoII ion located on an inversion center, a 4-formylbenzoate (FB) counter-anion and an uncoordinated water molecule. The four O atoms in the equatorial plane around the CoII ion form a slightly distorted square-planar arrangement with an average Co—O bond length of 2.086 A ; the slightly distorted octahedral coordination is completed by the two N atoms of the isonicotinamide (INA) ligands at a slightly longer distance [2.1603 (14) A ] in the axial positions. O— HÁ Á ÁO, N—HÁ Á ÁO and C—HÁ Á ÁO hydrogen bonds link the molecules into a three-dimensional network. – Contacts between the benzene and pyridine rings [centroid–centroid distance = 3.758 (1) A ] may further stabilize the crystal structure

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