摘要
密度() 并且粘性() 为 glycine 被测量, DL -- 丙氨酸 DL -- 缬氨酸,和 DL -- 在 0.05, 0.10, 0.15 和 0.20
Density(ρ)and viscosity(η)are measured for glycine,DL-α-alanine DL-α-valine,and DL-α-leucine in 0.05,0.10,0.15 and 0.20 mol·L^-1aqueous metformin hydrochloride at 308.15,313.15 and 318.15 K.The measured values are used to estimate some important parameters,such as partial molal volume Vφ,standard partial molal volume Vφ^0,transfer volume ΔVφ^0,hydration number nH,the second derivative of infinite dilution of partial molal volume with respect to temperature,viz., ^2 Vφ^0 /T^2,viscosity B-coefficient,variation of B with temperature,viz., dB/dT,free energy of activation per mole of solvent Δμ1^*0 and solute Δμ2^0* of the amino acids.These parameters are interpreted in terms of solute-solute and solute-solvent interactions and structure making/breaking ability of solutes in the given solution.In addition,Vφ^0,0 ΔVφ^0,viscosity B-coefficient,ΔB and Δμ2 ^0* are split into group contributions(NH3^+ COO ^-)and -CH2 of the amino acids using their linear correlation and their behavior is discussed.
关键词
偏摩尔体积
粘度性能
二甲双胍
氨基酸
盐酸盐
影响效应
水溶液
粘度B系数
standard partial molal volume, transfer volume, hydration number, viscosity B-coefficient, activation energy, metformin hydrochloride