0181581 - UFCH-W 20030004 RIV US eng J - Journal Article
Nagatani, H. - Samec, Zdeněk - Brevet, P. F. - Fermín, D. J. - Girault, H. H.
Adsorption and Aggregation of meso-Tetrakis(4-carboxyphenyl)porphyrinato Zinc(II) at the Polarized Water|1,2-Dichloroethane Interface.
Journal of Physical Chemistry. B. Roč. 107, č. 3 (2003), s. 786-790. ISSN 1089-5647
R&D Projects: GA ČR GA203/01/0946
Institutional research plan: CEZ:AV0Z4040901
Keywords : adsorption * polarized water * 1,2-dichloroethane interface
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 3.679, year: 2003

The specific adsorption of the water-soluble meso-tetrakis(4-carboxyphenyl)porphyrinato zinc(II) (ZnTPPC4-) was studied at the polarizable water|1,2-dichloroethane (DCE) interface by surface second harmonic (SH) generation and quasi-elastic laser scattering (QELS). The intense SH responses were analyzed as a function of the ZnTPPC4- concentration and of the Galvani potential difference. It was confirmed that the coverage of ZnTPPC increases as the Galvani potential difference approaches the formal ion transfer potential. In this potential range, the high interfacial concentration induces the formation of J-aggregates at the interface. The aggregation phenomena manifest itself by a red-shift of the SH response resonant to the Soret band and an overall increase in the SH intensity. At potentials more positive than the formal transfer potential, the SH spectrum exhibits a maximum at the same wavelength of absorption of ZnTPPC in solution, suggesting a low extent.
Permanent Link: http://hdl.handle.net/11104/0078129