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Muzaffarpur, India

Complexes of general formula [M(AQSC)2X2], where M = cobalt(II), nickel(II) and copper(II), AQSC = 2-aroyl quinoxaline semicarbazone, X = Cl-, Br-, I-, NO3- and ClO4- have been prepared. Complexes were characterized by analytical analyses and physico-chemical methods. The ligand, 2-aroyl quinoxaline semicarbazone behaves as a neutral, bidentate chelateing agent and bonded to the metal ion through azomethine nitrogen and oxygen atom of semicarbazone moiety. The remaining coordinating sites are occupied by anions such as Cl-, Br-, I-, NO3- and ClO4-. Electronic spectra and magnetic susceptibility measurements reveal octahedral geometry. The complexes were found to be non-electrolytic in nature on the basis of low value of molar conductance. The ligand as well as metal complexes have been screened for their antibacterial and antifungal activity. Source


The present work reports the synthesis of a series of Co(II), Ni(II) and Cu(II) complexes of neutral bidentate Schiff base prepared by the condensation of 2,3,4,5-tetrahydro indeno[1,2-d]thiazolo[3,2-a][1,3]pyrimidine-11(H)-one with semicarbazide hydrochloride. The ligand as well as metal complexes have been characterized by elemental analyses, molar mass, magnetic susceptibility, molecular conductivity, IR spectra, electronic spectra. On the basis of above observations, it is proposed that the ligand 2,3,4,5-tetrahydro indeno[1,2-d]thiazol[3,2-a][1,3]pyrimidine-11(H)-semicarbazone behaves as neutral bidentate manner and coordination takes place through azomethine N and carbonyl oxygen of semicarbazone moiety. The remaining positions of the metal ion are satisfied by negative ions such as Cl -, Br -, I - and NO 3 -. The complexes were proposed octahedral geometry. Source


[M(L)2X2], where M = Co(II), Ni(II) and Cu(II); L = 2-ethylindole-3-carboxaldehydesemicarbazone [EICS], X = Cl-, Br, I and NO 3 have been synthesized. The ligand and its metal complexes have been characterized by elemental analyses, molar mass, IR, UV, molar conductance and magnetic susceptibility measurements. Octahedral structure has been proposed on the basis of above physicochemical and spectroscopic measurements. These complexes have been screened for their antifungal effect on Aspergillus flavus and Salmonella typhi. All the complexes of Co(II), Ni(II) and Cu(II) have been shown good activity as antifungal agents on some selected fungal strains. Source


Rai B.K.,LNT College | Kumar C.,har University
Oriental Journal of Chemistry | Year: 2010

A series of complexes of the type [M(DDMS)2X2] where M = Co(II), Ni(II) and Cu(II), X = Cl, Br, I" and NO3-; DDMS = 3,4 dihydro- 5,6- dimethoxy isocoumarin semicarbazone. Schiff base ligand DDMS obtained by the condensation of 3,4 dihydro 5,6 dimethoxy isocoumarine and semicarbazide hydrochloride.The ligand as well as complexes have been characterized by elemental analysis, molar conductance, molar mass, magnetic susceptibility, electronic and IR spectral data. Elemental analyses confirm the stoichiometry of the complexes is 1:2 [Metahligand]. Study of IR spectral data proposes DDMS acts as neutral bidentate ligand and coordination takes place through azomethine N and carbonyl oxygen of semicarbazone moiety.The remaining positions of metal ions are satisfied by negative ions, such as Ch, Br, I" and NO3'.The molar conductance measurement in DMF indicates the non electrolytic nature of the complexes.The study of electronic spectral data and magnetic susceptibility measurement proposes the geometry of complexes are octahedral in nature. Source


Rai B.K.,LNT College | Kumar A.,Kctc College
Asian Journal of Chemistry | Year: 2013

Complexes of Co(II), Ni(II) and Cu(II) with 4-hydroxy-1-ethyl quinolin-2-(1H)-one hydrazone [HEQH] have been synthesized and characterized on the basis of their molar mass, elemental analyses, IR, UV, molar conductance and magnetic susceptibility measurements. On the basis of above physico-chemical and spectroscopic measurements it is proposed that the compound 4-hydroxy-1-ethyl quinolin- 2-(1H)-one hydrazone acts in a bidentate ligand and co-ordination proposes through azomethine N atom and oxygen atom. The remaining valency of metal ions are satisfied by neutral molecules such as ammonia, pyridine, α, β or γ-picolines. Electronic spectral and magnetic susceptibility of the complexes proposes octahedral geometry for Co(II) and Ni(II) complexes. The geometry of the Cu(II) complexes is distorted octahedral in geometry. Source

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