TY - JOUR
T1 - Interfacial aggregate growth process of Fe(II) and Fe(III) complexes with pyridylazophenol in solvent extraction system
AU - Yulizar, Yoki
AU - Monjushiro, Hideaki
AU - Watarai, Hitoshi
N1 - Funding Information:
This work was financially supported by a Grant-in-Aid for Scientific Research (A) (No. 12304045) and a Scientific Research of Priority Area (No. 13129204) from the Ministry of Education, Science, Sports and Culture, Japan.
PY - 2004/7/15
Y1 - 2004/7/15
N2 - The complexation mechanism and aggregate formation of bis[2-(5-bromo-2- pyridylazo)-5-diethylaminophenolate] iron(II) and iron(III) complexes at the heptane-water interface were studied spectrophotometrically by the high-speed stirring method and the centrifugal liquid membrane method. Furthermore, the reduction process of the Fe(III) complex with ascorbic acid at the interface was spectrophotometrically observed. The chemical compositions of the interfacial aggregate of complexes have been proved by the X-ray photoelectron spectroscopy. The aggregation of the complex at the interface was observed as a red-shifted, very strong and narrower absorption band with respect to the absorption band of the monomer complex. The aggregate of Fe(III) complex showed more shifted spectrum than that of Fe(II) complex, which proposed the larger aggregation number of Fe(III) aggregate (n=8) than that of Fe(II) aggregate (n=3). The obtained rate constants of interfacial aggregation were smaller than rate constants of interfacial monomer complexation, because the formation of aggregate required the assembly of the monomers.
AB - The complexation mechanism and aggregate formation of bis[2-(5-bromo-2- pyridylazo)-5-diethylaminophenolate] iron(II) and iron(III) complexes at the heptane-water interface were studied spectrophotometrically by the high-speed stirring method and the centrifugal liquid membrane method. Furthermore, the reduction process of the Fe(III) complex with ascorbic acid at the interface was spectrophotometrically observed. The chemical compositions of the interfacial aggregate of complexes have been proved by the X-ray photoelectron spectroscopy. The aggregation of the complex at the interface was observed as a red-shifted, very strong and narrower absorption band with respect to the absorption band of the monomer complex. The aggregate of Fe(III) complex showed more shifted spectrum than that of Fe(II) complex, which proposed the larger aggregation number of Fe(III) aggregate (n=8) than that of Fe(II) aggregate (n=3). The obtained rate constants of interfacial aggregation were smaller than rate constants of interfacial monomer complexation, because the formation of aggregate required the assembly of the monomers.
KW - 5-Br-PADAP
KW - Aggregation
KW - Centrifugal liquid membrane method
KW - High-speed stirring method
KW - Interfacial complexation
KW - Interfacial kinetics
KW - Liquid-liquid interface
KW - Metal pyridylazo complex
KW - Solvent extraction
KW - XPS
UR - http://www.scopus.com/inward/record.url?scp=2942625992&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2004.02.045
DO - 10.1016/j.jcis.2004.02.045
M3 - Article
C2 - 15178287
AN - SCOPUS:2942625992
SN - 0021-9797
VL - 275
SP - 560
EP - 569
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
IS - 2
ER -