SHAMIM KHAN - Academia.edu (original) (raw)

Papers by SHAMIM KHAN

E-Journal of Chemistry, 2011

Copper(II) complexes of chromen-2-one-3-carboxyhydrazide and 2-(chromen-3'-onyl)-5-(aryl)-1,3... more Copper(II) complexes of chromen-2-one-3-carboxyhydrazide and 2-(chromen-3'-onyl)-5-(aryl)-1,3,4-oxadiazole derivatives have been synthesized. The structural features have been determined from their microanalytical, magnetic susceptibility, molar conductance, IR, UV Vis,1H NMR and ESR spectral data. All the Cu(II) complexes exhibit the composition Cu(Ln)2X2; where L1= chromen-2-one-3-carboxy hydrazide, L2 = 2-(chromen-3'-onyl)-5-(2ʺ-hydroxy phenyl)-1,3,4-oxadiazole, L3 = 2-(chromen-3'-onyl)-5-(4ʺ-nitrophenyl)-1,3,4 -oxadiazole and L4 = 2-(chromen-3'-onyl)-5-(4ʺ-chlorophenyl)-1,3,4-oxadiazole; X = Cl-, Br-, NO3-, CH3COO-, ClO4-and CNS-. The N, O donor ligands act as a bidentate ligand in all the complexes. Distorted octahedral geometry for all the Cu(II) complexes is proposed. Molecular modeling studies have been made for the rapid structure building, geometry optimization and molecular display. These complexes show the conductance values, supporting their non-electrol...

The European Physical Journal Special Topics, 2013

We present studies of the the hyperfine (hf) structure of spectral lines of Praseodymium (Pr) by ... more We present studies of the the hyperfine (hf) structure of spectral lines of Praseodymium (Pr) by laser spectroscopic investigations as well as by analyzing Fourier Transform (FT) spectra. The experimental part of our work is done with the technique of laser-induced fluorescence (LIF) spectroscopy in a hollow cathode lamp. We present detailed studies of the very small region of 1.5Å (from 5810.5Å to 5812.0Å) in the visible area of the FT spectrum where at least 14 spectral lines are overlapping. In the investigated region we discovered two new even levels and three new odd levels and could classify 11 new spectral lines. The final goal is to model the emission spectrum by a sum of the hf profiles of all spectral lines in a certain region. Application of such modelling may be found in analyzing highly resolved stellar spectra.

E-Journal of Chemistry, 2011

Copper(II) complexes of chromen-2-one-3-carboxyhydrazide and 2-(chromen-3'-onyl)-5-(aryl)-1,3... more Copper(II) complexes of chromen-2-one-3-carboxyhydrazide and 2-(chromen-3'-onyl)-5-(aryl)-1,3,4-oxadiazole derivatives have been synthesized. The structural features have been determined from their microanalytical, magnetic susceptibility, molar conductance, IR, UV Vis,1H NMR and ESR spectral data. All the Cu(II) complexes exhibit the composition Cu(Ln)2X2; where L1= chromen-2-one-3-carboxy hydrazide, L2 = 2-(chromen-3'-onyl)-5-(2ʺ-hydroxy phenyl)-1,3,4-oxadiazole, L3 = 2-(chromen-3'-onyl)-5-(4ʺ-nitrophenyl)-1,3,4 -oxadiazole and L4 = 2-(chromen-3'-onyl)-5-(4ʺ-chlorophenyl)-1,3,4-oxadiazole; X = Cl-, Br-, NO3-, CH3COO-, ClO4-and CNS-. The N, O donor ligands act as a bidentate ligand in all the complexes. Distorted octahedral geometry for all the Cu(II) complexes is proposed. Molecular modeling studies have been made for the rapid structure building, geometry optimization and molecular display. These complexes show the conductance values, supporting their non-electrol...

The European Physical Journal Special Topics, 2013

We present studies of the the hyperfine (hf) structure of spectral lines of Praseodymium (Pr) by ... more We present studies of the the hyperfine (hf) structure of spectral lines of Praseodymium (Pr) by laser spectroscopic investigations as well as by analyzing Fourier Transform (FT) spectra. The experimental part of our work is done with the technique of laser-induced fluorescence (LIF) spectroscopy in a hollow cathode lamp. We present detailed studies of the very small region of 1.5Å (from 5810.5Å to 5812.0Å) in the visible area of the FT spectrum where at least 14 spectral lines are overlapping. In the investigated region we discovered two new even levels and three new odd levels and could classify 11 new spectral lines. The final goal is to model the emission spectrum by a sum of the hf profiles of all spectral lines in a certain region. Application of such modelling may be found in analyzing highly resolved stellar spectra.