Abstract
The synthesis, spectroscopic, and magnetic characterization of two new copper(II) and cobalt(II) complexes are described. Both two compounds have the general formula [M(L)2(Cl)2], in which L= 2-amino-5-bromopyridine. These complexes were prepared in one-step synthesis and characterized by elemental analysis, FTIR, UV-Vis, and EPR spectroscopy. Moreover, the single crystal structure of complex (1) was studied by the X-ray diffraction method. This compound consists of mononuclear units consisting of two ligands linked to metal via the nitrogen of pyridine ring. The UV-Vis spectra of copper(II) and cobalt(II) complexes show three and five absorption bands, respectively, attributed to the d-d transition of the metal ion, ligand → metal charge transfer, and π→π∗ or n→π∗ transitions of the ligand. The FTIR spectra show MN2Cl2 vibrations at 500–300 cm−1. The complexes show room temperature magnetic moments of 1.78 BM and 4.12 BM for Cu(II) and Co(II), respectively. The X-band electron spin resonance (ESR) spectra of Cu(II) complex in DMF or DMSO frozen at liquid nitrogen temperature show the typical ΔMS=±1 transition.
Highlights
E synthesis, spectroscopic, and magnetic characterization of two new copper(II) and cobalt(II) complexes are described. Both two compounds have the general formula [M(L)2(Cl)2], in which L = 2-amino-5-bromopyridine. ese complexes were prepared in one-step synthesis and characterized by elemental analysis, Fourier transform infrared (FTIR), UV-Vis, and EPR spectroscopy
The single crystal structure of complex (1) was studied by the X-ray diffraction method. is compound consists of mononuclear units consisting of two ligands linked to metal via the nitrogen of pyridine ring. e UV-Vis spectra of copper(II) and cobalt(II) complexes show three and ve absorption bands, respectively, attributed to the d-d transition of the metal ion, ligand → metal charge transfer, and ππ π ππ∗ or nn nnn∗ transitions of the ligand. e FTIR spectra show MN2Cl2 vibrations at 500–300 cm−1. e complexes show room temperature magnetic moments of 1.78 BM and 4.12 BM for Cu(II) and Co(II), respectively. e X-band electron spin resonance (ESR) spectra of Cu(II) complex in DMF or DMSO frozen at liquid nitrogen temperature show the typical ΔMMS = ±1 transition
E study of transition metal ion complexes by magnetic and optical techniques has furnished a considerable body of empirical data, much of which can be understood in terms of the phenomenological ligand eld theory [1]. e major portion of this data is primarily concerned with complexes containing a single paramagnetic transition metal ion; relatively little information is available on dimeric and trimeric coordination complexes [2]
Summary
E study of transition metal ion complexes by magnetic and optical techniques has furnished a considerable body of empirical data, much of which can be understood in terms of the phenomenological ligand eld theory [1]. e major portion of this data is primarily concerned with complexes containing a single paramagnetic transition metal ion; relatively little information is available on dimeric and trimeric coordination complexes [2]. Since copper(II) ions are widely distributed in biological systems, a signi cant amount of research has centered on the search for relatively simple copper(II) complexes which may display some of the properties of the metalloproteins. One such system of potential importance is that formed by copper(II) halides with pyridine and substituted pyridines [3]. Electronic properties of cobalt(II) compounds have received substantial attention [17,18,19] in part due to the fact that many of these complexes bind oxygen reversibly [20] and are model systems for vitamin B12r. Such complexes have potential for antibacterial activities, and we will focus on this subject in the future. e complexes were synthesized in a one-step synthesis and characterized by elemental analysis, Fourier transform infrared (FTIR), electronic spectra, room temperature magnetic moments, and a crystal structure
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