Journal de chimie physique et biophysique
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Synthesis and Characterization of Pendant 3-(2-pyridyl) pyrazole based ligands and Investigate Their Complexes of Cu(II), Zn(II), Ni(II), and Ru(II) In Solution

Adel M.Najar

Extend to our interest to design, synthesis and study the coordination behavior of 3-(2-pyridyl)pyrazole based ligands; new ligand containing bidentate chelating 3-(2-pyridyl)pyrazole unit connected to 3-methylbenzyl; 2-(1-(3-methylbenzyl)-1H-pyrazol-3-yl)pyridine (L1), has been synthesized and characterized using 1HNMR and mass spectroscopy. However, we have used 3-methylbenzyl moiety to examine the whole coordination behavior of the ligand in solution. Moreover, the molecular orbitals characterizations of new ligand (L1) have been investigated computationally using hyper chem tools.  The ligand (L1) used to prepare Cu(II), Zn(II) and Ru(II) complexes which have been structurally characterized using mass spectroscopy. Dissolve L1-complexes of Zn(II) in CH3CN and Ru(II) in CH3OH revealed that both of Zn(II) and Ru(II) ions coordinated by three units of 3-(2-pyridyl)pyrazole from three different ligands; which confirmed by mass spectroscopy. Moreover, tracking the [Ru(L1)3]2+ in methanoic solution emerged that three peaks assigned belonging to the complex: m 633.48, {Ru(L1)2Cl}+; 601.46, {Ru(L1)2}2+and 445.68, {Ru(L1)3}2+. The mass spectrum of dissolved powder in CH3CN shows peak at m/z 388.14 (100%) corresponds to [Cu(L1)2(ClO4)](ClO4)3.H2O. Also, influence of pendant naphthyl group of 2-(1-(naphthalen-2-ylmethyl)-1H-pyrazol-3-yl) pyridine (L2) to Zn(BF4)2, and Ni(BF4)2 have been investigated in solution using same technique.