Cosmological evolution in a two-brane warped geometry model

We study an effective 4-dimensional scalar-tensor field theory, originated from an underlying brane-bulk warped geometry, to explore the scenario of inflation. It is shown that the inflaton potential naturally emerges from the radion energy-momentum tensor which in turn results into an inflationary model of the Universe on the visible brane that is consistent with the recent results from the Planck's experiment. The dynamics of modulus stabilization from the inflaton rolling condition is demonstrated. The implications of our results in the context of recent BICEP2 results are also discussed.Comment: 11 pages, Latex style, 4 eps figures and 1 tabl

Synthesis, Spectroscopic, and Antimicrobial Studies of Binuclear Metallocene (M = Ti, Zr, or Hf) Derivatives of Bis(mercaptoazoles)

The reactions of (η5 − C5H5)2MCl2 (M = Ti, Zr, or Hf) with mercaptoazoles (LH2), namely, bis(mercaptotriazoles), bis(mercap- tooxadiazoles), and bis(mercaptothiadiazoles) in 2 : 1 molar ratio, respectively, have been studied in dry tetrahydrofuran in the presence of n-butylamine and the binuclear complexes of the type [{(η − C5H5)2 M}2(L)] (M = Ti/Zr/Hf) are obtained. Tentative structural conclusions are drawn for the reaction products based upon elemental analysis, electrical conductance, magnetic moment, and spectral data (UV-Vis, IR, 1H NMR, and 13C NMR). FAB-mass spectra of few complexes of each series were also carried out to confirm the binuclear structures. Studies were conducted to assess the growth-inhibiting potential of the complexes synthesized, and the ligands against various fungal and bacterial strains

Oxovanadium(IV) complexes with 14-membered macrocyclic ligands derived from dithiooxamide

644-647Oxovanadium(lV) complexes, [VO(L)] SO4'where L = 5,7,12, 14-R4-2, 3, 9, 10-S4‑[14]-1, 5, 7, 12-tetraene- 1,4,8, Ll-N4 have been prepared in methanol. Tentative structures of the complexes have been proposed on the basis of elemental analyses, electrical conductance, magnetic moment and spectral (JR, electronic and EPR) data. The X-band EPR spectra of all the complexes were recorded at room temperature and at liquid nitrogen temperature. The room temperature EPR spectra do not show anisotropy because of rapid tumbling of the molecules in solution but it is observed at liquid nitrogen temperature. The spectral studies support square pyramidal geometry for the oxovanadium (IV) complexes

Synthesis and spectroscopic investigations of oxovanadium(IV) derivatives with 1,1ʹ-diacetylferrocenyl-bis(hydrazones)

1906-1910The reactions of oxovanadium(IV) sulphate with bis(hydrazones) (LH2) derived from 1,1ʹ-diacetylferrocene and different aromatic acid/pyridine carboxylic acid hydrazides, in ethanol gives the complexes of type [VO(L)]. Tentative structural conclusions are drawn for the complexes based upon analyses, conductance, magnetic moments and spectral (IR , electronic and EPR) data

Lanthanum(III) and praseodymium(III) complexes with bidentate and tetradentate schiff base ligands containing indole ring

1198-1201Complexes of lanthanum(III) and praseodymium(III) with schiff bases, prepared from isatin with aniline, 4-chloroanilinc, 2-bromoaniline, 2-nitroaniline (HL), ethylenediamine, o-phenylenediamine and 4-methyl-o-phenylenediamine (H2L') have been synthesised and their physico-chemical properties investigated using elemental analysis, molar conductivities, magnetic susceptibility measurements and spectral (visible, infrared and 1H NMR) data. The schiff bases H2L' bind in a bidentate manner while schiff bases H2L' bind in a tetradentate manner. The probable structures of the complexes are proposed

Oxovanadium(IV) complexes with unsymmetrical macrocyclic ligands derived from <i>o</i>-bromoaniline, <i>α </i>-or <i>β</i>-diketones and primary diamines

887-890A new series of N4-donor unsymmetrical oxovanadium (IV) complexes of type [VO(mac)]SO4 (mac = macrocyclic ligands derived from o-bromoaniline, α -or β-diketones and aliphatic diamines e.g. ethylenediamine or 1 ,3-propylenediamine ) have been prepared by template synthesis. Tentative structures of the complexes have been proposed on the basis of elemental analysis, electrical conductance, magnetic moment and spectral (IR. electronic and EPR) data. The X-band EPR spectra of all the complexes have been recorded at room temperature and at liquid N2 temperature. The room temperature EPR spectra do not show anisotropy because of rapid tumbling of molecules in solution. The spectral studies support square-pyramidal geometry for the vanadium(IV) complexes

Template synthesis and spectroscopic studies on oxovanadium(IV) acyclic and macrocyclic complexes

447-451The template reactions of 2,6-diaminopyridine or 1,8-diaminonaphthalene with diacetyl or benzil in the presence of vanadyl(IV) produce N3O2 or N2O2 open chain complexes as a result of [2+1] schiff base condensation. These complexes contain free ketonic group. Therefore, the reactions of these complexes with diamines (o-phenylenediamine and 4-methyl-o-phenylenediamine) have been studied in presence of glacial acetic acid which cause ring closure and formation of macrocyclic complexes. The complexes so obtained have been characterized on the basis of elemental analysis, conductance, magnetic moment and spectral (electronic, IR and ESR) data. The probable structures of the complexes are suggested

Synthesis and characterization of acetylferrocenyl thiosemicarbazone derivatives of dichlorobis(cyclopentadienyl)hafnium(IV)

1421-1423The reactions of Cp2HfCl2 with thiosemicarbazones (LH) derived from acetylferrocene and substituted thiosemicarbazide (phenyl/4-chlorophenyl/4-ni tropheny1/4-methylphenyl thiosemicarbazide) in various stoichiometric ratios have been studied and the complexes of the type [Cp2HfCl(L)] are obtained. Tentative structural conclusions are drawn for the reaction products based upon elemental analyses, electrical conductance, magnetic moment and spectral data (UV -Vis, IR, 1H NMR and 13C NMR)