Supramolecular effects in dentritic systems containing photoactive groups
An. acad. bras. ciênc
;
72(1): 34-7, mar. 2000.
Article
in English
| LILACS
| ID: lil-259475
RESUMO
In this article are described dendritic structures containing photoactive groups at the surface or in the core. The observed supramolecular effects can be attributed to the nature of the photoactive group and their location in the dendritic architecture. The peripheric azobenzene groups in these dendrimeric compounds can be regarded as single residues that retain the spectroscopic and photochemical properties of free azobenzene moiety. The E and Z forms of higher generation dendrimer, functionalized with azobenzene groups, show different host ability towards eosin dye, suggesting the possibility of using such dendrimer in photocontrolled host-guest systems. The photophysical properties of many dendritic-bipyridine ruthenium complexes have been investigated. Particularly in aerated medium more intense emission and a longer excited-state lifetime are observed as compared to the parent unsubstituted bipyridine ruthenium complexes. These differences can be attributed to a shielding effect towards dioxygen quenching originated by the dendritic branches
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Azo Compounds
/
Ruthenium Compounds
/
Dendrites
Language:
English
Journal:
An. acad. bras. ciênc
Journal subject:
Science
Year:
2000
Type:
Article
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