SELF-ASSOCIATION OF PYRIDINE CARBOXYLIC-ACIDS AND OROTIC-ACID IN AQUEOUS-SOLUTION - AN ULTRAVIOLET STUDY

被引：4

作者：

PERAL, F

GALLEGO, E

MORCILLO, J

机构：

[1] CSIC,INST ESTRUCT MAT,E-28006 MADRID,SPAIN

[2] UNIV COMPLUTENSE,DEPT QUIM FIS,E-28040 MADRID,SPAIN

来源：

JOURNAL OF MOLECULAR STRUCTURE | 1990年 / 219卷

关键词：

D O I：

10.1016/0022-2860(90)80064-Q

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Self-association of picolinic, nicotinic, isonicotinic, and orotic acids in aqueous solution has been studied by ultraviolet spectroscopy. These compounds are suitable to test the possible formation of solute-solute intermolecular hydrogen bonds in the presence of water as solvent. Their spectra show an hypochromic effect with increasing concentration over the range from 10-6 to 10-1 mol dm-3, which can be explained by self-association of the solute molecules. The concentration dependence of the molar absorptivity has been measured at acid, neutral, and basic pH, to obtain association constants and discuss the influence of protonation and ionization of these compounds on the association mechanisms. © 1990.

引用

页码：251 / 256

页数：6

共 6 条

[1]

GALLEGO E, 1981, AN QUIM A-FIS TEC, V77, P118

[2]

GALLEGO E, 1981, AN QUIM A-FIS TEC, V77, P98

[3] ENTHALPY OF DIMERIZATION OF BENZENE IN WATER [J].