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141.
Ishar Singh Ahuja Shailendra Tripathi Chhote Lal Yadava 《Transition Metal Chemistry》1988,13(2):140-142
Summary Coordination compounds formed by the interaction of manganese(II), cobalt(II), nickel(II) and copper(II) chloride and bromide with 4-cyanoaniline (4-CA) have been prepared and characterized by molar conductance, magnetic susceptibilities, electronic and i.r. spectral measurements down to 200 cm–1 in the solid state. The isolated complexes are M(4-CA)2X2 except for nickel(II) bromide which is NI(4-CA)4Br2. I.r. spectra, indicate that 4-CA, though a potentially bidentate ligand, nevertheless acts only as a terminally aniline (NH2) bonded monodentate ligand in all the complexes. Tentative stereochemistries of the complexes have been suggested in the solid state. 相似文献
142.
Shailendra K. Singh Rakesh K. Sharma Shrawan K. Sindhwani 《Transition Metal Chemistry》1984,9(12):473-476
Summary The stability constants of the chelates formed from acenaphthenequinone monothiosemicarbazone and magnesium(II), manganese(II), cobalt(II), nickel(II), copper(II), zinc(II) or cadmium(II) have been determined pH-metrically in 75% v/v aqueous dioxan at various ionic strengths of NaClO4 and at different temperatures. The method of Bjerrum and Calvin(1, 2) as modified by Irving and Rossotti(3), has been used to determine the ñ and pL values. The stability constants were calculated on an IBM 360 FORTRAN-IV computer patterned after that of Sullivanet al.
(4) to give n values using a weighted least squares method. The Smin, values were also calculated. The thermodynamic stability constant has been determined by extrapolating the log K1
vs plot at zero ionic strength. The other thermodynamic functions have been calculated from the stability constants obtained for different temperatures at constant ionic strength. The bivalent metal stability sequence of AQTS chelates is in agreement with reported metal orders for other chelating reagents. The order of free energies and enthalpies of chelate formation for AQTS are: Mn2+2+2+2+>Zn2+. 相似文献
143.
Shailendra Kumar G Ravikumar P K Mishra P Chaddah B A Dasannacharya Ram Prasad N C Soni 《Pramana》1990,34(4):279-287
We have studied the variation of low field magnetization hysteresis in YBa2Cu3O7 as a function of the maximum magnetic field applied during a hysteresis cycle (1 G<H
max<7.3 G) and also as a function of temperature (77 K<T<95 K). The remnant magnetization is studied as a function ofH
max andT and the measured dependences are explained using the extended critical state model. The potential of this technique as a
contactless method of probing the temperature dependence ofJ
c is discussed. 相似文献
144.
Rajkamal Kushwaha Sangeeta Garg Shailendra Bajpai 《Research on Chemical Intermediates》2018,44(10):5759-5786
Rice husk was utilized as a silica source for the synthesis of mesoporous silica (MS), which was further used for the surface modification of iron oxide nanoparticles (IO-NPs) to form mesoporous silica-modified iron oxide nanoparticles (MSIO-NPs). IO-NPs and MSIO-NPs were characterized using FT-IR, XRD, X-ray photoelectron spectroscopy, vibrating sample magnetometry, nitrogen adsorption–desorption, TEM and dynamic light scattering analysis. The catalytic activity of MSIO-NPs was tested for degradation and mineralization of Nile blue sulphate dye (NBS) in Fenton-like oxidation process. The degradation efficiency and total organic carbon (TOC) removal of NBS dye onto MSIO-NPs was found to be 92.46 and 66.58%, respectively, after 20 min of reaction time using 5 mM of H2O2 concentration. Modified generalized kinetic model was developed for TOC removal of dye degradation onto MSIO-NPs, to account for oxidizable compounds, non-oxidizable compounds, and intermediate organic compounds. The intermediate products formed during degradation of NBS dye were detected by LC–MS experiment and ten fragments were identified based on mass to charge ratio (m/z). The mechanistic pathway for degradation of NBS dye onto MSIO-NPs has been proposed. 相似文献
145.
Kumar Neeraj Devineni Subba Rao Aggile Kadirappa Gajjala Prasad Reddy Kumar Pramod Dubey Shailendra Kumar 《Research on Chemical Intermediates》2018,44(1):567-584
Research on Chemical Intermediates - The present study is related to a commercially practicable new synthetic process for production of teneligliptin hydrobromide hydrate (1), a dipeptidyl... 相似文献
146.
Indranil Bhaumik Shailendra Kumar R. Bhatt B.N. Raja Sekhar 《Solid State Communications》2011,151(24):1869-1872
Large dispersion in the peak position of the OH− stretching mode (∼687.9 and ∼2167.7 cm−1/eV for fundamental and 3rd harmonic, respectively) is observed by Resonance Raman studies in congruent lithium tantalate single crystal under varying excitation energies. This is explained by considering the involvement of multiple LO phonons in the interaction with OH− stretching vibration and the resonantly excited electrons. The intensity of the peaks is also found to vary with the excitation energy. FWHM increases with the increase in excitation energy because of individual contributions of the increasing number of resonance steps to the broadening. 相似文献
147.