Chhapra, India
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Yadava A.K.,North Eastern Regional Institute of Science and Technology | Yadav H.S.,North Eastern Regional Institute of Science and Technology | Yadav U.S.,Jp University | Rao D.P.,P.A. College
Turkish Journal of Chemistry | Year: 2012

Oxovanadium(IV) complexes having the general formula [VO(L)] were designed and synthesized using vanadyl ion as kinetic template with ligands derived by condensation of β-diketones such as acetylacetone, benzoylacetone, thenoyltrifluoroacetone, and dibenzoylmethane with 2-amino-3-hydroxypyridine or 2-aminobenzoic acid or 2-aminonicotinic acid. Tentative structures of the complexes were proposed on the basis of elemental analysis, molar conductance, magnetic moments, and spectral (infrared, electronic and electron spin resonance) data. All the oxovanadium(IV) complexes are 5-coordinated wherein derived ligands act as tetradentate chelating agents. © TÜBITAK.


Yadava A.K.,North Eastern Regional Institute of Science and Technology | Yadav H.S.,North Eastern Regional Institute of Science and Technology | Singh S.,P.A. College | Yadav U.S.,Jp University | Rao D.P.,Da V College
Journal of Chemistry | Year: 2013

A series of oxovanadium(IV) complexes of the type [VO(mac)]SO(where mac = tetraazamacrocyclic ligands derived from condensation of 4,4,4-trifluro-1-(2- furyl)-1,3-butanedione or 4,4,4-trifluro-1-(2-thenyl)-1,3-butanedione with p-phenylenediamine and their reaction with β-diketones) have been prepared using oxometal ion of vanadium as kinetic template. These complexes have been ascertained by electrical conductance, magnetic moment, elemental analyses, infrared, e.s.r. and electronic spectral data. All the oxovanadium(IV) complexes are five-coordinate ones. © 2013 A. K. Yadava et al.


Pathak V.K.,Institute of Technology for Women | Pandey P.R.,Jp University
Rasayan Journal of Chemistry | Year: 2012

Some novel complexes of ligands N - (5-Bromo-Napthyl) -2- mercapto propanamide and N- (5-methoxy Napthyl) - 2- mercapto propanamide with Cu(II), Ni(II) and Co(II) were prepared. The ligands and their metal complexes were characterized by Physico - chemical spectroscopic techniques. The spectral data suggested the deprotonation of thiol (-SH) group and its coordination to the metal ions in complexes. It was also suggested to involve NH group in coordination to the metal ion through nitrogen atom. Further, spectroscopic studies suggested tetrahedral, octahedral Cu(II) complexes, octahedral Ni(II) complexes and square planar as well as octahedral Co(II) complexes. © 2012 RASĀYAN. All rights reserved.


Rai B.K.,Lnt College | Singh V.,Jp University | Vidyarthi S.N.,Jp University | Sinha P.,Jp University
Asian Journal of Chemistry | Year: 2011

In the present work, complexes of hexacoordinated Co(II), Ni(II) and Cu(II) complexes of the type [M(APQH)X2] where M = Co(II), Ni(II) and Cu(II), APQH = 3-amino-2-phenyl-4(3H)-quinazoline hydrazone, X = Cl -, Br -, I - and NO 3 -. The prepared ligand APQH and its complexes have been characterized by elemental analyses, molar mass, molar conductance, infrared spectra, electronic spectra and magnetic susceptibility measurements. On the basis of above physico-chemical observations, the compound APQH acts as a neutral bidentate ligand and coordination proposes through azomethine nitrogen and primary amino group of quinazoline side chain. The remaining position of metal ions are occupied by negative ions such as Cl -, Br -, I - and NO 3 -. The structure of the complexes are proposed to be octahedral in nature.


Rai B.K.,Lnt College | Sinha P.,Jp University | Vidyarthi S.N.,Jp University | Singh V.,Jp University
Asian Journal of Chemistry | Year: 2011

A series of Co(II), Ni(II) and Cu(II) Schiff base complexes of the general composition [M(TITPT) 2X 2] where M = Co(II), Ni(II) and Cu(II); TITPT= 2,3,4,5-tetrahydroindeno(1,2-d)thiazolo(3,2-a)[1,3]pyrimidine- (10H) thiosemicarbazone; X=Cl -, Br -, I - and NO 3 - were synthesized and characterized. The ligand and its Co(II), Ni(II) and Cu(II) complexes were formulated by elemental analyses, molar mass, infrared spectra, electronic spectra, magnetic susceptibility and molar conductance data. In the light of above studies it is proposed that the TITPT behaves as bidentate ligand and coordination takes place through azomethine nitrogen and thione sulphur atom of thiosemicarbazone moiety. The remaining positions of metal ions are satisfied by negative ions such as Cl -, Br -, I - and NO 3 -. The complexes were proposed to be octahedral in geometry.


Singh M.K.,Dr. Y.S. Parmar University of Horticulture and Forestry | Singh N.B.,Dr. Y.S. Parmar University of Horticulture and Forestry | Naik P.K.,Jp University
Indian Journal of Ecology | Year: 2014

Genetic characterization of 94 genotypes (4 female, 10 male, and 80 half sibs) of Salix were analyzed using 10 SSRs and 15 RAPDs PCR-based molecular markers. RAPD analysis yielded 87 polymorphic fragments (98.9%), with an average of 5.8 polymorphic fragments per primer. Similarly, SSR analysis produced 33 bands, out of which 26 were polymorphic (78.8%) with an average of 2.6 polymorphic fragments per primer. The genetic diversity was high among the genotypes (Nei's genetic diversity = 0.354 and Shannon's information index = 0.536) as measured by combination of both RAPD and SSR markers. The mean coefficient of gene differentiation (Gst) was 0.037, indicating 96.6% of the genetic diversity resided within the genotypes. It was found that the genetic diversity among genotypes was broader, suggesting the importance and feasibility of introducing elite genotypes from different hybrids for willows germplasm conservation and breeding programs.


Goodwill K.,Sharda University | Saxena V.N.,JP University | Kartikeyan M.V.,Indian Institute of Technology Roorkee
2013 International Conference on Signal Processing and Communication, ICSC 2013 | Year: 2013

An antenna design is presented for antenna performance improvement for WLAN applications at 5.2 GHz and 5.8 GHz. Improved Patch antenna gain and radiation efficiency has been achieved in this work. Two CSSRR have been etched in the ground plane to achieve size reduction for dual band operation. The proposed antenna provides good flexibility on selection of dual frequency operation by modifying dimension of CSSRR and patch while capacitive matching has been achieved by gap coupling. The antenna was designed using CST V.12 simulator. © 2013 IEEE.

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