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121.
Raju R. Kale Virendra Prasad Divya Kushwaha Vinod K. Tiwari 《Journal of carbohydrate chemistry》2013,32(2):130-142
A facile, simple, and high-yielding synthetic protocol for novel glycosyl tetrazoles has been devised from different carbohydrate-containing amides using benzotriazole methodology under mild reaction condition. 相似文献
122.
Ram Lakhan Prasad Anita Kushwaha Rajesh Kumar Imre Miklós Szilágyi László Kótai 《Journal of Thermal Analysis and Calorimetry》2013,114(2):653-664
Monometallic complexes [Cudadb·yH2O]n (2) and [Nidadb·yH2O]n (3) and heterobimetallic complex [Cu0.5Ni0.5dadb·yH2O]n (4) {where dadbH2 = 2,5-Diamino-3,6-dichloro-1,4-benzoquinone (1); y = 2–4; n = degree of polymerization} were characterized by elemental analysis, atomic absorption spectroscopy, infrared spectroscopy (FTIR) and powder X-ray diffraction. The thermal behaviour of the complexes was studied by thermal analysis (TG/DTA) under air as well as under helium atmospheres. The released gaseous products were investigated by evolved gas analysis performed by an online coupled mass spectrometer (TG/DTA-MS). Thermal degradation of 2 under helium atmosphere is distributed over five steps, whereas 3 and 4 exhibited only four degradation steps due to overlap of second and third degradation steps of into one major step. All the complexes exhibit three steps degradation under air. The complex 2 loses NH group in the second and HCl/Cl2, CO groups simultaneously in third steps of decomposition under helium, whereas it loses NH and CO groups simultaneously in low temperature region of second step of degradation under air atmosphere as the loss of CO group is facilitated by air. EGA-MS under air and helium atmospheres shows that HCl, CO/CO2 and (CN)2 fragments are lost simultaneously at multiple steps, and not successively as predicted earlier. Rate of evolution of most evolved gases exhibits several maxima as a consequence of degradation followed by recombination reactions. Final residues under air and helium atmospheres correspond to the metal oxides and metals along with some carbonaceous matter. 相似文献
123.
S. Mishra S. Maity S. Bhalke G. G. Pandit V. D. Puranik H. S. Kushwaha 《Journal of Radioanalytical and Nuclear Chemistry》2012,294(1):97-102
In order to understand the mobility of uranium it is very important to know about its sorption kinetics and the thermodynamics behind the sorption process on soil. In the present study the sorption kinetics of uranium was studied in soil and the influence parameters to the sorption process, such as initial uranium concentration, pH, contact time and temperature were investigated. Distribution coefficient of uranium on soil was measured by laboratory batch method. Experimental isotherms evaluated from the distribution coefficients were fit to Langmuir, Freundlich and Dubinin?CRadushkevich (D?CR) models. The sorption energy for uranium from the D?CR adsorption isotherm was calculated to be 7.07?kJ?mol?1.The values of ??H and ??S were calculated to be 37.33?kJ?mol?1 and 162?J?K?1?mol?1, respectively. ??G at 30?°C was estimated to be ?11.76?kJ?mol?1. From sorption kinetics of uranium the reaction rate was calculated to be 1.6?×?10?3?min?1. 相似文献
124.
125.
Carbohydrate based fluorescent sensors S1 and S2 have been developed by fluorogenic dual click chemistry and are characterized by various spectroscopic techniques. Both the fluorescent probes displayed highly selective detection of Cu2+ ions by means of fluorescence quenching. The job plot experiment suggested 1:1 complexation of probes S1 and S2 with Cu2+ ions having detection limit of 6.99 μM and 7.30 μM, respectively. The binding constants for S1-Cu2+ and S2-Cu2+ complexation were evaluated to be 3.34 × 103 M−1 and 5.93 × 103 M−1, respectively. 相似文献
126.
R. A. Ganeev P. A. Naik H. Singhal U. Chakravarty V. Arora J. A. Chakera R. A. Khan M. Raghuramaiah S. R. Kumbhare R. P. Kushwaha P. D. Gupta 《Optics and Spectroscopy》2007,103(5):831-838
The results of investigation of the higher harmonics (from the 21st to the 61st order) of radiation of a femtosecond laser (793 nm, 48 fs) that are generated in silver plasma are presented. The changes in the shape and spectra of harmonics for different chirps of the laser radiation are studied. It is found that the wavelengths of harmonics generated in the region of the plateaulike distribution of the converted radiation intensity can be tuned. It is shown that the conditions of phase matching between harmonics and laser radiation are different for different modulations of the femtosecond pulse spectrum. The tuning range of the spectrum of the converted radiation in the region of lower harmonics, which lie in the beginning region of the plateau, is shown to amount to 0.8 nm. 相似文献