名称:
Synthesis, spectroscopic and structural characterization of Co(II), Ni(II) and Cu(II) complexes of substituted 2-pyridyl amine based [N,N] chelating ligand
摘要:
The reaction of N-benzylaminopyridine with the imidoylchloride of N-(2,6-iPr(2)C(6)H(3))acetamide in the presence of Et3N affords a new neutral INN] chelating ligand, (PhCH2)N(2-pyridyl)C[(Me)(=-N-2,6-iPr(2)C(6)-H-3)] (L). The reaction of equimolar quantities of L with Cu(NO3)(2), CuCl2 and NiBr2, respectively, in DCM, acetonitrile and DME yields the corresponding mononuclear complexes L center dot Cu(NO3)(2) (1), L center dot CuCl2 (2) and L center dot NiBr2 (3). Whereas, the reaction of L with CoCl2 center dot 6H(2)O leads to the formation of [HL center dot CoCl3] (4) with pyridine nitrogen coordinated to cobalt. Solid state structure of L and compounds 1-4 have been investigated by single crystal X-ray structural analysis. The ligand L shows the E-anti arrangement in the solid state and its mononuclear complex 1 shows six coordinated Cu in a quasi square planar geometry with two long distanced donors; complexes 2 and 3 show distorted tetrahedral arrangement of the substituents around metal ions. Interestingly, the solid state structure of complex 4 reveals C-H center dot center dot center dot Cl intra-molecular hydrogen bonding and N-H center dot center dot center dot Cl and C-H center dot center dot center dot Cl inter-molecular hydrogen bonds. These hydrogen bonding interactions in complex 4 facilitate the formation of an extended 2D network structure. (C) 2012 Elsevier Ltd. All rights reserved.