Asian Journal of Chemical Sciences

Synthesis and Crystal Structure Studies of a New Complex of Co (III)-Schiff Base Derivative Derived from Isonicotinohydrazide

Babacar Diop *

Department of Chemistry, University Cheikh Anta DIOP de Dakar, Sénégal.

Thierno Moussa Seck

Department of Chemistry, University Cheikh Anta DIOP de Dakar, Sénégal.

Cheikh Ndoye

Department of Chemistry, University Cheikh Anta DIOP de Dakar, Sénégal.

Ibrahima El-hadji Thiam

Department of Chemistry, University Cheikh Anta DIOP de Dakar, Sénégal.

Ousmane Diouf

Department of Chemistry, University Cheikh Anta DIOP de Dakar, Sénégal.

Farba Bouyagui Tamboura

Department of Chemistry, University Alioune DIOP de Bambey, Sénégal.

Pascal Retailleau

Institut de Chimie des Substances Naturelles, CNRS UPR 2301, Université Paris-Sud, Université Paris-Saclay., 1, av. de la Terrasse, 91198 Gif-sur-Yvette, France.

Mohamed Gaye

Department of Chemistry, University Cheikh Anta DIOP de Dakar, Sénégal.

*Author to whom correspondence should be addressed.

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Abstract

A new Co(III) complex prepared by the reaction of N'–(1–(pyridin–2 yl)ethylidene) isonicotinohydrazide (H₂L) with Co(II) ion is reported in this paper. The H₂L ligand is structurally characterized by elemental analysis, NMR, and infrared spectroscopies. The mononuclear complex [Co(HL)₂]·Cl·3H₂O (1), is characterized by infrared spectroscopy, elemental analysis, conductance, magnetic room temperature measurement and single X-ray diffraction. The complex crystallizes in the monoclinic system with space group P21/c. The parameters of the unit cell are a = 9.6818(3) Å; b = 25.1587(6) Å; c = 11.5481(3) Å;   β = 101.797(3) °; Z = 4; R_int = 0.0313 and wR(F₂) = 0.0812. The asymmetric unit of the compound contains a discrete [Co(HL)₂]⁺ cation one  free chloride anion and three uncoordinated water molecules. In the discrete cation one Co³⁺ ion two organic ligand molecules are present. The coordination polyhedron around the Co³⁺ center is best described as a distorted octahedral with CoN₄O₂ chromophore. The crystal structure of the complex is stabilized by intramolecular and intermolecular hydrogen bonds.

Keywords: Schiff base, isonicotinohydrazide, cobalt, X-ray diffraction, complex, mononuclear

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