Synthesis and Spectroscopic Study of Some Transition Metal Complexes with New Pyrazolinone Ligand Derived from 2-Hydrazino Quinoxaline-3-one

Mahmoud Najim Al-Jibouri*, Taghreed M. Musa and Ahmad H. Ismail

Department of Chemistry, College of Science, Mustansiriyah University, Baghdad, Iraq

*Corresponding author: E-mail:;


New transition metal complexes of manganese(II), cobalt(II), nickel(II), copper(II) and zinc(II) with (E)-3-[4-(hydroxy(phenyl)methylene)-3-methyl-5-oxo-4,5-dihydro-1H-pyrazol-1-yl]quinoxalin- 2(1H)one were synthesized and characterized by elemental analysis, FT-IR, NMR and mass spectra. The ligand was synthesized by the reaction of 2-hydrazinoquinoxaline-3(1H,4H)-one with 3-acetylcoumarin. All the metal complexes are found to be monomer in nature and have tetrahedral geometry. The IR spectra data revealed that the ligand behaves as neutral bidentate Lewis base through two nitrogen atoms of pyrazole and pyrazine moiety forming six-membered ring. The molar conductivity measurements suggested the neutral nature of all metal complexes in DMF solution. The magnetic moment measurements investigated the high spin properties of all the metal complexes.


Transition metal(II) complexes, Pyrazole, Pyrazolinone.

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