Photobehaviour and DNA interaction of styrylquinolinium salts bearing thiophene substituents.
Photochem Photobiol Sci
; 10(6): 973-9, 2011 Jun.
Article
en En
| MEDLINE
| ID: mdl-21359300
ABSTRACT
A photochemical and photophysical study on three quinolinium iodides, free and complexed with DNA, was carried out by stationary and pulsed techniques. The comparison with the behaviour of pyridinium analogues pointed to a reduction in the photoisomerization yield of these compounds in favour of fluorescence and internal conversion. These quinolinium salts showed a good affinity towards salmon DNA with association constants ≈10(4) M(-1) and a different photobehaviour when involved in the formation of ligand-DNA complexes. The drastic reduction of photoisomerization observed under excitation of 1/3-DNA complexes and accompanied by a huge increase of the fluorescence quantum yields was connected to interaction modes favouring intercalation proposed for these planar quinolinium derivatives.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Compuestos de Quinolinio
/
Tiofenos
/
ADN
Límite:
Animals
Idioma:
En
Revista:
Photochem Photobiol Sci
Asunto de la revista:
BIOLOGIA
/
QUIMICA
Año:
2011
Tipo del documento:
Article
País de afiliación:
Italia