DiscussionCobalt complexes of Schiff bases have been extensively studied. They play an important role in both synthetic and structural research [1][2][3]. In addition, recent investigations have shown that certain cobalt complexes are potent antiviral reagents [4], As an extension of our work on the structural characterization of Schiff base complexes [5][6][7], a new mononuclear Schiff base cobalt(II) complex is reported here. The Co(II) atom located on the inversion center is four-coordinated by two Ο and two imine Ν atoms from two Schiff base ligands, forming a tetrahedral environment. The amine Ν atoms of the pendant propylaminomethyl units are protonated and do not take part in the coordination to the Co atom. The bond lengths and angles subtended at the Co center are typical and comparable to the values observed in other cobalt(II) complexes derived from Schiff bases [8][9][10]. The title compound crystallizes isostructurally with the analogous Zn compound [11]. Source of materialReagents and solvents used were of commercially available quality. 5-Bromo-2-hydroxybenzaldehyde (201.2 mg, 1.0 mmol), Nmethyl-l,3-diaminopropane (88.3 mg, 1.0 mmol) and Co(NÜ3)2 · 4H2O (127.5 mg, 0.5 mmol) were dissolved in ethanol (80 ml). The mixture was stirred for 20 min at room temperature to give a clear brown solution. Red block-shaped crystals, suitable for Xray structure determination were formed by slow evaporation of the solution in dark for a week. Elemental analysis -found: C, 36.20 %; H, 4.33 %; N, 11.72 %; calc. for C22H3oBr 2 CoN 6 08: C, 36.43 %; H, 4.17 %; Ν, 11.59 %.
Source of materialReagentsand solvents used were of commercially available quality. 5-Bromo-2-hydroxybenzaldehyde (201.2 mg, 1.0 mmol), Nmethyl-1,3-diaminopropane (88.3 mg, 1.0 mmol) and Co(NO 3 ) 2 · 4H 2 O(127.5 mg, 0.5 mmol) were dissolved in ethanol (80 ml). The mixture wasstirred for 20 min atroom temperature to give a clearbrown solution. Red block-shaped crystals, suitable for Xraystructure determination were formed by slow evaporation of the solutionindark for aweek. Elementalanalysis -found: C,36.20 %; H,4.33 %; N,11.72 %; calc. for C 22 H 30 Br 2 CoN 6 O 8 :C,36.43 %; H,4.17 %; N,11.59 %. DiscussionCobalt complexes of Schiff bases have been extensively studied. They playanimportant role in both synthetic and structuralresearch [1][2][3]. Inaddition, recent investigations have shown that certain cobalt complexes are potent antiviralreagents [4]. Asan extension of our work on the structuralcharacterization of Schiff base complexes [5][6][7], anew mononuclearSchiff base cobalt(II) complex is reported here. The Co(II)atom located on the inversion center is four-coordinated by two Oand two imine Natoms from two Schiff base ligands, forming atetrahedralenvironment. The amine Natoms of the pendant propylaminomethyl units are protonated and do not take part in the coordination to the Coatom. The bond lengths and angles subtended atthe Cocenter are typicaland comparable to the values observed in other cobalt(II)complexes derived from Schiff bases [8][9][10]. The titlecompound crystallizesisostructurally with the analogous Zncompound [11].
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