Potentiometric and spectroscopic studies on yttrium(III) complexes of dihydroxybenzoic acids.
The equilibrium reactions of yttrium(III) ion with dihydroxybenzoic acids (2,3-dihydroxybenzoic acid (2,3-DHBA) and 3,4-dihydroxybenzoic acid (3,4-DHBA)) (H(3)L) were investigated in aqueous solution by means of potentiometric and spectroscopic methods, in 0.1 mol.l(-1) ionic strength medium at 25 degrees C. The stability constants are reported for YL, YL(HL)(2-) and YL(2)(3-)- type mononuclear complexes. 2,3-DHBA can bind Y(III) ion strongly and the salicylate mode is effective over the acidic pH range. But in higher pH range, 2,3-DHBA and 3,4-DHBA act more efficiently through catecholate groups. The complexes of 2,3-DHBA are more stable than the complexes of 3,4-DHBA.
Aydin
Rahmiye
R
Department of Chemistry, Faculty of Arts and Sciences, Uludağ University, 16059-Bursa, Turkey. rahmiye@uludag.edu.tr
Ozer
Ulviye
U
D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D062385:Hydroxybenzoates / Q000737:chemistry*; D007202:Indicators and Reagents; D011199:Potentiometry; D012459:Salicylates / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D015019:Yttrium / Q000737:chemistry*
D062385:Hydroxybenzoates; D007202:Indicators and Reagents; D012459:Salicylates; C009091:protocatechuic acid; D015019:Yttrium; C009135:2,3-dihydroxybenzoic acid