http://nopr.niscpr.res.in/handle/123456789/60818 Sun, 11 Oct 2026 07:11:50 GMT 2026-10-11T07:11:50Z http://nopr.niscpr.res.in/handle/123456789/60830 Title: Temperature dependent dielectric relaxation studies of 2-nitrotoluene-dimethyl sulfoxide mixture using time domain reflectometry Authors: Dhage, H M; Deshmukh, A R; Birajdar, S S; Kumbharkhane, A C Abstract: The dielectric relaxation measurements of 2-nitrotoluene (2-NT) with dimethyl sulfoxide (DMSO) for 11 different concentrations have been carried out in the frequency range from 10 MHz to 50 GHz using time domain reflectometry method. In this frequency range, a dielectric relaxation spectrum of 2-NT-DMSO mixtures shows Debye type relaxation behaviour. The static dielectric constant, dielectric relaxation time, Kirkwood correlation factor, excess dielectric properties have been determined from 20oC to 5oC. The excess dielectric and Kirkwood correlation factor gives the information about formation and orientation of electric dipoles in the mixture. As the concentration of 2-NT in DMSO increases, dipole changes its orientation from anti-parallel to parallel. The thermodynamic parameters (enthalpy, entropy and Gibbs free energy) have been determined from the relaxation time using least squares fit method. Page(s): 1153-1158 Tue, 01 Nov 2022 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/60830 2022-11-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/60829 Title: One pot synthesis of 4,5-dibromo-3,6-diarylpyridazine from 1,4-diarylbuta- 1,3-diyne Authors: Shit, Prasenjit; Singha, Raju Abstract: A one-pot two-step methodology has been developed for the synthesis of 4,5-dibromo-3,6-diarylpyridazines starting from easily available starting material 1,4-diarylbuta-1,3-diynes. The reaction goes through the electrophilic addition of Br+ ion with alkyne bonds followed by nucleophilic addition of hydrazine and intramolecular cyclization. Page(s): 1159-1163 Tue, 01 Nov 2022 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/60829 2022-11-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/60828 Title: Cancellation of contact quenching: A simple concept for selective chemosensing of basic fluoride and acetate anions Authors: Mashraqui, Sabir Hussain; Ghorpade, Sushil S; Khan, Tabrez; Sharma, Brijesh M Abstract: A weakly fluorescent acid-base pair formed by reacting fluorescent acridine orange with the quencher picric acid is reported for the detection of basic fluoride and acetate anions. Deprotonation by these anions causes disengagement of the fluorescent acridine orange from the quencher, picric acid. This phenomenon cancels the quenching existing in the native probe, thereby allowing for the optical signalling of fluoride and acetate anions by colour modulation as well as fluorescence switch-on response. Anions such as Br, I, Cl, NO3, SCN, HSO4, and H2PO4 offer no detectable interference even when in excess concentration. Page(s): 1164-1168 Tue, 01 Nov 2022 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/60828 2022-11-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/60827 Title: Synthesis and characterization of novel oxime analogues Authors: Naik, Nutan; Rao, Gopal Krishna; N, Sanjay Pai P Abstract: Novel oxime analogs have been synthesized from the tricyclic scaffolds. A series of iminoesters have been synthesized by reacting oximes with anti-inflammatory drugs such as Naproxen, Ibuprofen, Aspirin, Etodolac, Aceclofenac, Flurbiprofen in the presence of the coupling agent N,N′-dicyclohexylcarbodiimide. Page(s): 1169-1172 Tue, 01 Nov 2022 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/60827 2022-11-01T00:00:00Z