http://www.cnr.it/ontology/cnr/individuo/prodotto/ID170923
Surfactant-like behaviour of short-chain alcohols in porphyrin aggregation (Articolo in rivista)
- Type
- Label
- Surfactant-like behaviour of short-chain alcohols in porphyrin aggregation (Articolo in rivista) (literal)
- Anno
- 2009-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1021/jp903430u (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Maria Angela Castriciano; Maria Grazia Donato; Valentina Villari; Norberto Micali; Andrea Romeo; Luigi Monsù Scolaro (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- CNR-Istituto per lo Studio dei Materiali Nanostrutturati, Salita Sperone 31, I-98166 Vill. S. Agata,
Messina, Italy, CNR-Istituto per i Processi Chimico-Fisici, Salita Sperone, Contrada Papardo, Faro Superiore,
98158 Messina, Italy, and Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica and
C.I.R.C.M.S.B., UniVersita' di Messina, Salita Sperone 31, 98166 Vill. S. Agata, Messina, Italy (literal)
- Titolo
- Surfactant-like behaviour of short-chain alcohols in porphyrin aggregation (literal)
- Abstract
- UV/vis absorption and time-resolved fluorescence measurements on alcoholic solutions of meso-tetrakis(4-
sulfonatophenyl)porphyrin (TPPS4) in neutral and acid form have been performed as a function of the alcohol
polarity. These solutions show a peculiar behavior that mimics porphyrin in confined water solutions. In
alcohols, TPPS4 exhibits a metastable phase showing the formation of new species in analogy with the confined
water environment of AOT microemulsions. Various species have been detected at different pH values and
on aging the solutions. Under neutral pH conditions, the porphyrin is present as free base monomer (S415)
with a small amount of H-dimeric species (S400). On aging, the S415 leads to the formation of a new species
(S423), which has been assigned as a J-type dimer of the neutral porphyrin. The species S400 and S423 are
not present in bulk water solution but are typical of TPPS4 in confined water. On decreasing pH, the S415
almost immediately converts into the diacid form (S438), which evolves toward red-shifted J-aggregates (S490)
and blue-shifted H-aggregates (S420). On decreasing alcohol polarity, the kinetic evolution from fresh to
aged solution and from the monomeric diacid species to H- and J-aggregates speeds up. Exploiting the
amphiphilic character of short chain alcohols and widely varying their polarity, we were able to enhance in
bulk conditions the peculiar behavior observed in close proximity to the microemulsion wall. (literal)
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- Autore CNR
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