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Titolo:
Two-dimensional condensation of small organic molecules at electrodes
Autore:
Donner, C; Pohlmann, L; Kirste, S; Baumgartel, H;
Indirizzi:
Free Univ Berlin, Inst Theoret & Phys Chem, D-14195 Berlin, Germany Free Univ Berlin Berlin Germany D-14195 ys Chem, D-14195 Berlin, Germany
Titolo Testata:
CHEMIA ANALITYCZNA
fascicolo: 2, volume: 45, anno: 2000,
pagine: 175 - 188
SICI:
0009-2223(2000)45:2<175:TCOSOM>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
MERCURY WATER INTERFACE; PHASE-TRANSITIONS; ADSORPTION; NUCLEATION; ADLAYERS; FILMS;
Keywords:
adsorption; phase transition; DNA bases; nucleation; growth;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Donner, C Free Univ Berlin, Inst Theoret & Phys Chem, Takustr 3, D-14195 Berlin, Germany Free Univ Berlin Takustr 3 Berlin Germany D-14195 rlin, Germany
Citazione:
C. Donner et al., "Two-dimensional condensation of small organic molecules at electrodes", CHEM ANAL, 45(2), 2000, pp. 175-188

Abstract

The adsorption of organic molecules at electrodes leads to two- dimensional "gas-like" systems at the electrode surface. It is well known that these adsorbates under certain conditions of electrode potential, bulk concentration and temperature undergo a phase transition forming two- dimensional molecular films with well defined structures. Several substance classes undergo such a phase transition or condensation. Among them, the DNA bases are ofspecial interest. The thymine and adenine condensation are reported on as examples of film formation. The main emphasis is put on the kinetics of film formation. The kinetics has been studied by potential jump experiments. Depending on the start and final potentials different shapes of current transients can be detected. On the basis of a qualitative interpretation of these different shapes, a new method for the determination of the potential ofmaximum adsorption is developed. This method is applied to the systems of thymine and adenine, respectively, adsorbed on mercury electrodes. The knowledge of this potential with respect to the potential of zero charge of thepure electrolyte allows to calculate the orientation and reorientation of the organic dipoles in relation to the electrode surface.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/08/20 alle ore 23:29:47