Rajesh Kumar
Articles written in Journal of Chemical Sciences
Volume 102 Issue 5 October 1990 pp 713-720
S Mishra Ravindra Kumar S K Aryal S Kumar Rajesh Kumar M M Bajaj
The application of Fourier transform infrared spectroscopy and laser Raman spectroscopy for obtaining structural information about the subtle changes occurring at the molecular level following leprosy, pulmonary tuberculosis, infected burns, epilepsy and Duchenne muscular dystrophy (DMD) are reported in this paper. It is shown that IR spectra exhibit specific signals for each disease. Results of the observed bands of hemoproteins are compared with those of normals. Raman spectra of IgG reveal that alpha-helical conformations are introduced partially in case of the proliferation of
Volume 121 Issue 4 July 2009 pp 497-502
Rajesh Kumar Yogesh Chandra Joshi
Acylation of 5-(2-ethoxyphenyl)-1-methyl-3-propyl-1,6-dihydro-$7H$-pyrazolo [4,3-d) pyrimidin-7-one
Volume 121 Issue 5 September 2009 pp 579-588
We analyse the problem of impedance for a diffusion controlled charge transfer process across an irregular interface. These interfacial irregularities are characterized as two class of random fractals: (i) a statistically isotropic self-affine fractals and (ii) a statistically corrugated self-affine fractals. The information about the realistic fractal surface roughness has been introduced through the bandlimited power-law power spectrum over limited wave numbers. The details of power spectrum of such roughness can be characterized in term of four fractal morphological parameters, viz. fractal dimension ($D_H$), lower ($\ell$), and upper (𝐿) cut-off length scales of fractality, and the proportionality factor (𝜇) of power spectrum. Theoretical results are analysed for the impedance of such rough electrode as well as the effect of statistical symmetries of roughness. Impedance response for irregular interface is simplified through expansion over intermediate frequencies. This intermediate frequency expansion with sufficient number of terms offers a good approximation over all frequency regimes. The Nyquist plots of impedance show the strong dependency mainly on three surface morphological parameters i.e. $D_H$, $\ell$ and 𝜇. We can say that our theoretical results also provide an alternative explanation for the exponent in intermediate frequency power-law form.
Volume 127 Issue 3 March 2015 pp 439-445 Regular Articles
Ramakrishna V S Nirogi Rajesh Kumar Badange Kiran Kumar Kandukuri Mukkanti Khagga
In continuation to our efforts to develop better treatment options for cognitive decline, we have been focussing on 5-HT6 receptor (5-HT6R) antagonists, which are known to be involved in improving cognitive function in numerous animal models. In this paper, we report a novel series of [3-[(1-Methylpiperidin-4-yl) methyl] arylsulfonyl]-1
Volume 135 All articles Published: 26 December 2022 Article ID 0002
POONAM KUMARI SAVITA KHATRI PRATIBHA AHLAWAT POOJA HOODA V B TAXAK S P KHATKAR RAJESH KUMAR
Six bright red europium(III) complexes [Eu(L)3.H2O].11H2O-(C1), [Eu(L)3. dmph].11H2O-(C2),[Eu(L)3.bipy].11H2O-(C3), [Eu(L)3.neo].11H2O-(C4), [Eu(L)3.batho].11H2O-(C5) and [Eu(L)3.phen].11H2O-(C6) with L (9-fluoro-2,3-dihydro-3-methyl-10-(4-methyl-1-piperazinyl)-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid) as main ligand and N-donor heterocyclic aromatic system as secondary ligands were synthesized by solvent assisted grinding method. The synthesized complexes were characterized by elemental analysis and various spectral analyses like IR, 1H-NMR,13C-NMR, and UV-vis. The thermal stability of these complexes was investigated by TG/DTG, and complexes were found thermally stable up to 244°C. In order to investigate photophysical properties, excitation, emission spectra, and decay time curves were observed by PL spectrophotometer. On excitation at 397 nm in the UV-vis region, synthesized complexes emit crimson red color mainly due to the most intense 5D0→7F2 transition. In the chromaticity diagram, the CIE color coordinates (x, y) of complexes fall in the crimson-red region. CCT and color purity values were calculated using CIE color coordinates, indicating that the complexes emit warm red light with high color purity. Energy band gap value and Urbach energy were computed from diffuse reflectance data offree ligands and synthesized complexes. The resulting output of these parameters suggests that the synthesized complexes were utilized in optoelectrical devices and semiconductors. Antimicrobial and anti-oxidant characteristics of synthesized complexes were examined by tube dilution and DPPH, respectively. The results showed that complexes have good anti-oxidant, antibacterial and antifungal behaviour.
Synopsis: Metal complexes containing ligand β-keto carboxylic acid and europium metal were synthesized. The synthesized complexes were characterised through NMR, IR spectroscopy. The high thermal stability of complexes was determined through TGA data. Photoluminescent properties were studied through emission, excitation and decay time. The synthesized complexes lie in red region of the CIE graph.
Volume 135, 2023
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