摘要
Enthalpies of solution of L-alanine in water and aqueous solutions of LiNO3,NaNO3,KNO3,（NaClO4） and Na2SO4 were determined at T=298.15 K by a RD496-Ⅱ microcalorimeter.The transfer enthalpies(ΔHtr) of L-alanine from water to aqueous solutions of salts were derived and discussed in terms of the（electrostatic） interaction and the structural interaction.ΔHtr decreases overall with increasing the concentration of（LiNO3）,NaNO3,KNO3 and NaClO4 but increases with increasing the concentration of Na2SO4.The results show that in LiNO3,NaClO4 and Na2SO4 solutions the structural interaction is responsible for the trends of ΔHtr,while in NaNO3 and KNO3 solutions the effect of electrostatic interaction is predominant. The ion with larger size can make a larger destructive effect on the hydration structure of L-alanine. Anion has more obvious influence on the magnitude of the transfer enthalpy than cation.
Enthalpies of solution of L-alanine in water and aqueous solutions of LiNO3, NaNO3, KNO3, NaClO4 and Na2SO4 were determined at T=298. 15 K by a RD496-Ⅱ microcalorimeter. The transfer enthalpies （△Htr） of L-alanine from water to aqueous solutions of salts were derived and discussed in terms of the electrostatic interaction and the structural interaction. △Htr decreases overall with increasing the concentration of LiNO3, NaNO3, KNO3 and NaClO4 but increases with increasing the concentration of Na2SO4. The results show that in LiNO3, NaClO4 and Na2SO4 solutions the structural interaction is responsible for the trends of △Htr, while in NaNO3 and KNO3 solutions the effect of electrostatic interaction is predominant. The ion with larger size can make a larger destructive effect on the hydration structure of L-alanine. Anion has more obvious influence on the magnitude of the transfer enthalpy than cation.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第7期1366-1368,共3页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:20273061)资助
