http://nopr.niscpr.res.in/handle/123456789/40891 2026-10-09T20:39:37Z http://nopr.niscpr.res.in/handle/123456789/41593 Title: Self-assembled metal supported supramolecular architecture-strategy and prospects Authors: Chawla, S K Abstract: In the past two decades the area of supramolecular chemistry has mainly developed in two directions; synthesis and applications of host-guest complexes by non-covalent interactions and construction of supramolecular architectureviaself-organisationofappropriate sub-units. Hydrogen bonding, hydrophobic interactions and recently metal assistance have been utilised to develop the latter type of architecture. The present review surveys the developments in the area of metal supported self-assembled supramolecular chemistry. Page(s): 729-741 1997-09-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/41592 Title: Dynamics in benzene-hexafluorobenzene solution forming specific interaction Authors: Nakagawa, Tetsuo Abstract: The concentration dependence of the dynamic properties for the benzene (C₆H₅) hexafluorobenzene (C₆H₅) mixture has been investigated to test the extended conformal solution (ECS) theory against the negative excess enthalpy (<em>H</em>^E) system; the dynamic properties studied are second order orientational correlation time (t_2R) of a benzene-d₆, (C₆D₆) molecule, translational self-diffusion coefficient (D ) of the respective components, and viscosity (h). The respective dynamic properties have been fitted to the quadratic equations on the mole fraction of C₆H₅, and the quadratic (regular) terms are obtained. The strong interaction between unlike components has been recognized through the sizes and signs of the regular terms of the respective dynamic properties. In particular, the thennodynamically attractive force (negative IF ) slows down the reorientational motion of a C₆H₅ molecule in the C₆H_{5 -}C₆F₅mixture. The validity of the Stokes-Einstein (SE) and Stokes-Einstein-Debye (SED) laws have also been checked for t_2R and <em>D</em>. Both laws break down in the low viscosity ranges. The thennodynamically attractive force also enlarges the microscopic specific reorientational and translational parameters. Page(s): 742-748 1997-09-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/41591 Title: Kinetics and mechanism of ammonolysis and alkaline hydrolysis of naphthyl acetates in aqueous medium: Part 1 - 4-Substituted l-naphthyl acetates Authors: Nadar, P Ananthakrishna; Rajarathinam, D Abstract: A series of 4- substituted 1-naphthyl acetates have been prepared. The kinetics of their ammonolysis have been followed at 20°, 25° and 30°C under pseudo-first order conditions at different <i>p</i>H in water containing 1% dioxan at an ionic strength of 1.0 mol dm-3. The possible mechanisms suggest the existence of general base catalysis for 4-methyl-1-naphthyl acetate. For esters with electron-withdrawing substituents, ammonolysis proceeds through an unassisted simple nucleophilic substitution pathway. The alkaline hydrolysis of all the esters is also followed under identical reaction conditions. Page(s): 749-753 1997-09-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/41590 Title: Effects of inorganic salts on rate of alkaline hydrolysis of <i>N</i>-phthaloylglycine: Kinetic evidence for the ion-pair formation Authors: Khan, Mohammad Niyaz Abstract: The effects of [LiCI], [NaCI], [Na₂CO₃], [KCI], and [BaCl₂] on the rate of reaction of hydroxide ion with anionic N-phthaloylglycine (S^-) at 30&deg;C and in an aqueous solvent containing 2% v/v CH₃CN reveal a nonlinear increase in pseudo-first order rate constants (k_obs) with increase in [salt]. The observed data are explained in terms of a mechanism involving ion-pair formation between S^- and cations of the salts. The association constants for ion-pair formation are highly sensitive to the valence state of cations and almost insensitive to the valence state of anions of the salts. Page(s): 754-759 1997-09-01T00:00:00Z