Browsing by Author "Ashutosh K. Srivastav"

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2-Aminoacetophenone-2-thenoylhydrazone complexes of bivalent 3d metal ions
(Kluwer Academic Publishers, 1989) Bachcha Singh; Ashutosh K. Srivastav
2-Aminoacetophenone-2-thenoylhydrazone, Haath, C4H3SC(O)NHN=C(Me)C6H4NH2-o, forms complexes with metal(II) salts of empirical compositions [VO(Haath)2SO4], [M(Haath)2Cl2] [M=CoII, NiII, CuII or ZnII] and [M(aath)2] [M=VIVO, CoII, NiII, CuII or ZnII] which have been characterized by elemental analyses, molar conductance, magnetic susceptibility, electronic, e.s.r., i.r. and n.m.r. (1H and13C) spectral studies. X-ray and electron diffraction patterns have been obtained in order to elucidate the structure of the CuII complexes. Photoacoustic spectra of powder NiII complexes have been recorded and interpreted in the light of u.v./vis. spectra. © 1989 Chapman and Hall Ltd.
A new route to bimetallic azine-bridged complexes: Synthesis and characterization of mononuclear (Mn, Co, Ni, Cu, Zn), homobinuclear (Zn-Zn) and heterobinuclear (Mn-Zn, Co-Zn, Ni-Zn, Cu-Zn) azine-bridged complexes
(Springer Netherlands, 1996) Bachcha Singh; Ashutosh K. Srivastav
A novel unsymmetrical tetradentate azine, 2-acetylpyridinesalicylaldazine (Haps), was prepared by condensing salicylhydrazone with 2-acetylpyridine, and was characterized by elemental analysis and its i.r. spectrum. This ligand reacted with Mn, Co, Ni, Cu and Zn acetates to yield deprotonated M(aps)2(H2O)2 complexes. Subsequent reaction of the mononuclear unit Zn(aps)2(H2O)2 with MCl2 gave homo- [ZnCl2Zn(aps)2(H2O)2] and heterobinuclear [MCl2Zn(aps)2(H2O)2] type azine-bridged complexes, which were characterized by analytical, molecular weight, conductivity (solid and solution), magnetic susceptibility, and electronic, e.s.r. and i.r. spectroscopies, and X-ray powder diffraction data. © 1996 Chapman & Hall.
Studies on 2-aminobenzophenone-2-thenolhydrazone complexes of some bivalent transition metal ions
(Kluwer Academic Publishers, 1988) Bachcha Singh; Ashutosh K. Srivastav; Preeti Srivastava
Complexes having the chemical compositions [VO(Habth)2SO4], [M(Habth)2Cl2] [M=CoII, NiII, CuII or ZnII) and [M(abth)2] [M=VIVO, CoII, NiII, CuII or ZnII) and Habth=2-aminobenzophenone-2-thenoylhydrazone] have been prepared and characterized. The complexes are non-electrolytes. Magnetic moments and electronic, photoacoustic, e.s.r. and i.r. spectra of the complexes are used to establish the stereochemistry and mode of bonding of the hydrazone. © 1988 Chapman and Hall Ltd.
Synthesis and characterization of heterobinuclear (La-Zn, Pr-Zn, Nd-Zn, Sm-Zn, Eu-Zn, Gd-Zn, Tb-Zn, Dy-Zn) azine-bridged complexes
(1997) Bachcha Singh; Ashutosh K. Srivastav; Praveen K. Singh
Zinc(II) complex of 2-acetylpyridine salicyl aldazine (Haps) of the type Zn(aps)2(H2O)2 has been synthesised. The reaction of Zn(aps)2(H2O)2 with lanthanide chlorides, LnCl3 (where Ln = La, Pr, Nd, Sm, Eu, Gd, Tb and Dy) yields azine-bridged heterobinuclear complexes of the formulae LnCl3Zn(aps)2(H2O)2. These complexes have been characterized by elemental analyses, molecular weight, conductance (solid and solution) and magnetic susceptibility measurements, mass, IR and electronic spectral data. X-ray powder diffraction data indicate the tetragonal unit lattice for Zn(aps)2(H2O)2 and PrCl3Zn(aps)2(H2O)2.
Synthesis and characterization of some lanthanide complexes of "stibanate"
(Marcel Dekker Inc., 1998) B. Singh; Ashutosh K. Srivastav
The lanthanide complexes of stibogluconate [C12H17O17Sb2]3-(SG) having the formula Na3[Ln(SG)2] [Ln = La(III), Pr(III), Nd(III), Sm(III), Eu(III), Gd(III), Tb(III) and Dy(III)] have been synthesized. These complexes were characterized on the basis of analytical data and TGA and DTA, magnetic susceptibility and infrared, electronic and emission spectroscopy. Results of infrared spectroscopy suggest bonding of SG through the carboxylate moiety. The hypersensitive band profile of the Nd(III) complex indicated a coordination number of eight. The emission spectra suggested low symmetry without an inversion centre for the europium(III) complex and high symmetry for the terbium(III) complex.