THERMODYNAMIC STUDIES ON THE N-ACETIC ACI D SUBSTITUTED TETRAAZAMACROCYCLE AND ITS LANTHANIDE COMPLEXES

Authors
BI JH HU DY NI SS XU JD
Citation
Jh. Bi et al., THERMODYNAMIC STUDIES ON THE N-ACETIC ACI D SUBSTITUTED TETRAAZAMACROCYCLE AND ITS LANTHANIDE COMPLEXES, Gaodeng xuexiao huaxue xuebao, 16(5), 1995, pp. 674-677
Citations number
15
Categorie Soggetti
Chemistry
Journal title
Gaodeng xuexiao huaxue xuebao → ACNP
ISSN journal
02510790
Volume
16
Issue
5
Year of publication
1995
Pages
674 - 677
Database
ISI
SICI code
0251-0790(1995)16:5<674:TSOTNA>2.0.ZU;2-D
Abstract
The protonation constants of the macrocycle ramethyl-1,4,8,11-tetraaza macrocyclotetradeca-N',, N'', N''' N''''-tetraacetic acid)were determi ned by potentiometric titrations in 0.5 mol/L KNO3 solution at 25+/-0. 1 degrees C, 40+/-0,1 degrees C and 80+/-0.1 degrees C, The stability constant of the complexes of H(4)L with La3+, Nd3+, Pr3+, Sm3+, Eu3+, Gd3+, Dy3+, Yb3+ were determined by the same method at 40+/-0.1 degree s C and 80+/-0.1 degrees C. The enthalpies of coordination reaction of H(4)L with H+ in the solution were given. Experimental results show t hat the complexes have high stability.