Excess viscosities (ɳE) of glycine with halide salts of alkali metals of lA group in aqueous solutions at 310.15 K for structural interactions

Chemistry Research Lab, Deshbandh College, University of Delhi, New Delhi-110 019, India
E-mail : p_maneesha@yahoo.com
Manuscript received 6 June 2005

Density ρ ± 1 kg m^-3 (1 x 10^-5 g cm^-3) and viscosity ɳ ± 1 x 10-⁴ kg m^-1 s^-1 for 0.01 to 0.33 mol kg^-1 lithium to cesium chloride and iodide salts, and glycine (Gly) 0.01 to 0.10 mol kg^-1 in 0.01 mol kg^-1 salts have been measured at pH = 7. The data were regressed and extrapolated to zero concentrations (m = 0) for limiting density (ρ 0), viscosity (ɳ⁰) and slopes (S_d) and S_ɳ values, respectively. Relative viscosities (ɳ_r) are fitted to extended Jones-Dole equation for intrinsic viscosity (B at m = 0) and slope (D) values, the ρ⁰ and ɳ⁰ are intensive while and S_d and D extensive functions. Thus the formers illustrate ion-water, ion-Gly and ion-water-Gly while latter the ion-ion interactions, and the B size of hydrated ion and ion-Gly associations. The p⁰ and B values increase with composition except RbCI and 8 of Gly are higher for RbCI and Csl, and ρ⁰ for RbCl and Nal. Their values are rationalized with shell size, filled and unfilled d orbital. Excess viscosities (ɳ^E) were calculated from ɳ and fitted to Redlich-Kister equation for excess viscosity function (Y^E). It explains deviations from ideal behavior on ion-ion-water, Gly-ion-ion, Gly-ion-water, Gly-Gly-ion and Gly-Gly-water interactions.