Koch Bihār, India
Koch Bihār, India

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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.


Rai B.K.,Lnt College | Anand P.,J P University
Oriental Journal of Chemistry | Year: 2012

A bidentate oxygen/nitrogen containing Schiff base ligand 2-acetyl naptho [2,1-b] furan hydrazone (ANFH) and their Co(II), Ni(II) and Cu(II) complexes have been synthsized and characterized by molar mass, elemental analyses, spectroscopic (IR and electronic), molar conductivity and magnetic susceptibility measurements at the room temperature. On the basis of above studies it is proposes that ligand is suggested to acts in a bidentate manner and coordination proposes through azomethine nitrogen and nitrogen atom of furan ring. The remaining coordination centre are satisfied by negataive ions such as CI -, Br -, I - and NO 3 -. The Co(II), Ni(II) complexes have octahedral geometry where as Cu(II) complexes were proposed distorted octahedral geometry.


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.


Rai B.K.,Lnt College | Kumar C.,Lnt College
Asian Journal of Chemistry | Year: 2010

The Co(II), Ni(II) and Cu(II) complexes have been synthesized with 3,4-diethyl isoquinolone thiosemicarbazone [DIQT]. All the complexes were identified and confirmed by elemental analyses, IR spectra, electronic spectra, molar conductivity, molar mass and magnetic susceptibility data. The molar conductance measurements revealed that the prepared complexes are non-electrolytic in nature. The magnetic susceptibility and electronic spectral data indicates the geometry of the complexes is octahedral in nature. Their spectral data proposed the coordination sites of the free ligand with the central metal ion through azomethine N and thione S. The remaining coordination positions are satisfied through negative ions such as Cl-, Br -, I-, NO3 - and ClO - 4. The ligand and its metal complexes were tested for their antimicrobial activity against Aspergillus niger and Aspergillus flavous.


A new series of transition metal complexes of Co(II), Ni(II) and Cu(II) have been synthesized from the Schiff base derived from 2,3,4,5- tetrahydroindeno-[1,2-d]-thiazolo-[3,2-a]pyrimidine-10(H)-one. Structural features were obtained from their elemental analysis, molar conductance, Molar mass, IR, electronic spectral study and magnetic susceptibility data. Based on the stoichiometries and spectroscopic studies, the complexes have general formula [M(TITPS) 2X 2]; where M = Co(II), Ni(II) and Cu(II); TITPS = 2,3,4,5-tetrahydroindeno-[1,2-d]-thiazolo-[3,2-a]-pyrimidine- 10(H)semicarbazone; X = Cl -, Br -, I - and NO 3 -. The electronic spectral and magnetic susceptibility data of the complexes suggest an octahedral geometry around the central atom. The ligand and its complexes were tested for their antimicrobial study and antifungal screening gave good results in the presence of metal ion in the ligand system.


[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.


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.


Rai B.K.,Lnt College | Thakur A.,Amrita University | Divya,Delhi Institute of Pharmaceutical science and Research
Asian Journal of Chemistry | Year: 2013

A bidentate nitrogen/ oxygen containing Schiff base ligand, 3-amino-2-methyl quinazoline-4(3H)hydrazone (AMQH) and its Co(II), Ni(II) and Cu(II) complexes have been synthesized and characterized by molar mass, elemental analyses, spectral (IR and electronic) molar conductivity measurements at the room temperature. On the basis of above spectral and physicochemical studies it is proposed that ligand 3-amino-2-methyl quinazoline-4(3H)hydrazone acts in a bidentate manner and coordination proposes through amino group of quinazoline and azomethine N atom. The remaining coordination of metal ions are satisfied by negative ions such as Cl-, Br-, I- and NO3 -. The electronic spectral data proposes an octahedral geometry for Ni(II) and Co(II) while the geometry of Cu(II) complexes are proposed to be distorted octahedral in nature.


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.


Rai B.K.,Lnt College | Anand R.A.,Jai Prakash University
Asian Journal of Chemistry | Year: 2013

Co(II), Ni(II) and Cu(II) complexes of 4-methyl-1,2-dihydro-2- oxoquinazoline were synthesized and characterized by molar mass, elemental analyses, infrared spectra, electronic spectra, conductivity and magnetic measurements. The analytical data proposes the composition of the metal complexes to be ML2X2; where M = Co(II), Ni(II); X = Cl-, Br-, I-and NO3-and M = Cu(II), X = X = Cl-, Br-and NO3 L = 4-methyl-1,2-dihydro-2-oxoquinazoline hydrazone. IR results demonstrate the bidentate binding of the Schiff base involving azomethine nitrogen and carbonyl oxygen. The electronic spectral measurements proposes Co(II), Ni(II) have octahedral geometry, where Cu(II) complexes have distorted octahedral geometry.

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