Synthesis and Characterization of a Novel Quinoxaline-Substituted vic-Dioxime and Its Complexes Containing Bis(12-Diazacrown-4) Derivatives
نویسندگان
چکیده
A new quinoxaline-substituted vicinal dioxime ligand containing bis(12-diazacrown-4) units (H2L) was synthesized by the reaction of cyanogen di-N-oxide with compound 4. Mononuclear Ni and Cu complexes with a metal: ligand ratio of 1:2 for H2L and a trinuclear Cu II complex were also synthesized. The mononuclear Cu species coordinated to two Cu ions through the deprotonated oximate oxygens to yield a trinuclear structure cis-bridged by the oximate groups, with 1,10-phenanthroline as an end-cap ligand. The mononuclear Co complex of H2L was isolated with pyridine and chlorine as axial ligands. In addition, a Co complex containing the BF2 þ bridge macrocycle was synthesized using a precursor hydrogen-bridged Co complex via a template effect. The extraction abilities of 1, 3, and 11 were also evaluated in 1,2-dichloroethane by using several alkali (Liþ, Naþ, Kþ, and Csþ) and transition-metal picrates, such as Agþ, Pb2þ, Cd2þ, Cu2þ, and Zn2þ. Structures of the ligands and metal complexes were solved by elemental analyses, H and CNMR, FT-IR, UV–vis, and mass spectra.
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A Density Functional Theory Investigation of d8 Transition Metal(II) (Ni, Pd, Pt) Chloride Complexes of Some Vic-dioximes Derivatives
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