http://www.cnr.it/ontology/cnr/individuo/prodotto/ID39696
Uncharged water-soluble porphyrin tweezers as supramolecular sensor for alpha-amino acids (Articolo in rivista)
- Type
- Label
- Uncharged water-soluble porphyrin tweezers as supramolecular sensor for alpha-amino acids (Articolo in rivista) (literal)
- Anno
- 2007-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1088/0957-4484/18/37/375503 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- V. Villari; P. Mineo; N. Micali; N. Angelini; D. Vitalini; E. Scamporrino (literal)
- Pagina inizio
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- CNR-Istituto per i Processi Chimico-Fisici, Via La Farina 237, I-98123 Messina, Italy
Dipartimento di Scienze Chimiche, Universit`a di Catania, Viale Andrea Doria 6,I-95125 Catania, Italy
CNR-Istituto di Chimica e Tecnologia dei Polimeri, Viale Andrea Doria 6,
I-95125 Catania, Italy (literal)
- Titolo
- Uncharged water-soluble porphyrin tweezers as supramolecular sensor for alpha-amino acids (literal)
- Abstract
- The binding between uncharged cobalt porphyrin tweezers and L-amino acids
in aqueous solutions is studied by means of UVvis and circular dichroism
spectroscopy. By varying the length of the aliphatic bridge between the two
porphyrin units, the number of cobalt ions in the porphyrin cores and the pH
of the solution, the chirality induction phenomenon has been investigated.
The binding of the amino acid to the porphyrin seems to occur via a
coordination mechanism between the metal and the nitrogen of the amino
group; the steric, hydrophobic and pipi interactions operate to stabilize the
complexes. The chirogenesis displays an opposite behaviour in the presence
of aromatic guests with respect to the non-aromatic ones. Moreover, the
UVvis and the induced circular dichroism spectral changes suggest that the
amino acid arrangement in the tweezers is determined by many factors, so
that, unlike in organic solvent, the porphyrin tweezers in aqueous solution
allow for two different arrangements of the same aromatic amino acid. The
experimental findings indicate that the porphyrins tweezers reported in the
paper are promising in opening perspectives toward their application as a
selective molecular sensor in aqueous solutions directly. (literal)
- Prodotto di
- Autore CNR
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