Jadavpur University

About: Jadavpur University is a education organization based out in Kolkata, India. It is known for research contribution in the topics: Population & Fuzzy logic. The organization has 10856 authors who have published 27678 publications receiving 422069 citations. The organization is also known as: JU & Jadabpur University.

Physicochemical Studies on the Micellization of Cationic, Anionic, and Nonionic Surfactants in Water–Polar Organic Solvent Mixtures

Abstract: The effect of cosolvent (ethane-1,2-diol and dimethyl sulfoxide) on the self-assembly of three surfactants, N,N,N-trimethyl-1-dodecanaminium bromide (DTAB), sodium [dodecanoyl(methyl)amino]acetate (SDDS), and polyoxyethylene (20) sorbitan monolaurate (Tween-20) in aqueous solution have been investigated by conductometric, tensiometric, and viscometric techniques at 298 K. The main focus was on the effect of solvent on critical micelle concentration (cmc), free energy contribution to micellization (ΔGm0), tail transfer Gibbs free energy (ΔGtrans0), Gibbs adsorption energy (ΔGads0), and some micellar interfacial parameters, for example, Gibbs surface excess (Γmax), minimum area per surfactant molecule (Amin), surface pressure (Πcmc), and pC20(= −log(C20), where C20 is the surfactant molar concentration required to reduce the surface tension of mixed solvent by 20 mN m–1). With increasing concentration of cosolvent in the binary mixture, the cohesive force decreases, and surfactant molecules are more soluble...

Monometallic and Bimetallic Ruthenium(II) Complexes Derived from 4,5-Bis(benzimidazol-2-yl)imidazole (H3Imbzim) and 2,2′-Bipyridine as Colorimetric Sensors for Anions: Synthesis, Characterization, and Binding Studies

Abstract: Mixed-ligand monometallic and bimetallic ruthenium(II) complexes of compositions [(bpy)2Ru(H3Imbzim)](ClO4)2·2H2O (1) and [(bpy)2Ru(H2Imbzim)Ru(bpy)2](ClO4)3·CH2Cl2 (2), where H3Imbzim = 4,5-bis(benzimidazol-2-yl)imidazole and bpy = 2,2′-bipyridine, have been synthesized and characterized using standard analytical and spectroscopic techniques. The X-ray crystal structures of both compounds have been determined and showed that 1 crystallized in the triclinic form with space group P1 and 2 is in the monoclinic form with space group P2(1)/m. The anion binding properties of complexes 1 and 2, as well as those of the parent H3Imbzim, were thoroughly investigated in an acetonitrile solution using absorption, emission, and 1H NMR spectral studies, which revealed that both of the metalloreceptors act as sensors for F−, for AcO−, and, to some extent, for H2PO4−. At a relatively lower concentration of anions, a 1:1 hydrogen-bonded adduct was formed; however, in the presence of an excess of anions, stepwise deproto...