Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
The dynamics of electronic energy transfer in novel multiporphyrin functionalized dendrimers: A time-resolved fluorescence anisotropy
Autore:
Yeow, EKL; Ghiggino, KP; Reek, JNH; Crossley, MJ; Bosman, AW; Schenning, APHJ; Meijer, EW;
Indirizzi:
Univ Melbourne, Sch Chem, Photophys Lab, Parkville, Vic 3052, Australia Univ Melbourne Parkville Vic Australia 3052 arkville, Vic 3052, Australia Univ Sydney, Sch Chem, Sydney, NSW 2006, Australia Univ Sydney Sydney NSWAustralia 2006 h Chem, Sydney, NSW 2006, Australia Eindhoven Univ Technol, Lab Macromol & Organ Chem, NL-5600 MB Eindhoven, Netherlands Eindhoven Univ Technol Eindhoven Netherlands NL-5600 MB ven, Netherlands
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 12, volume: 104, anno: 2000,
pagine: 2596 - 2606
SICI:
1520-6106(20000330)104:12<2596:TDOEET>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLY(PROPYLENE IMINE) DENDRIMERS; EXCITED-STATE TRANSPORT; EXCITATION TRANSFER; STARBURST DENDRIMERS; MULTICHROMOPHORIC CYCLODEXTRINS; ANTENNA SUPERMOLECULES; MICELLE SOLUTIONS; ROOM-TEMPERATURE; DIPOLE-DIPOLE; SYSTEMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
92
Recensione:
Indirizzi per estratti:
Indirizzo: Ghiggino, KP Univ Melbourne, Sch Chem, Photophys Lab, Parkville, Vic 3052,Australia Univ Melbourne Parkville Vic Australia 3052 3052, Australia
Citazione:
E.K.L. Yeow et al., "The dynamics of electronic energy transfer in novel multiporphyrin functionalized dendrimers: A time-resolved fluorescence anisotropy", J PHYS CH B, 104(12), 2000, pp. 2596-2606

Abstract

The dynamics of electronic energy transfer (EET) for a series of sphericalporphyrin arrays based on different generations of poly(propylene imine) dendrimers have been investigated using time-resolved fluorescence anisotropy measurements (TRAMS) in a glass environment. The first, third, and fifth generation dendrimers consisting of 4, 16, and 64 porphyrin chromophores, respectively, are investigated in this study. We observe a depolarization ofthe fluorescence in all three dendrimers as compared to the monoporphyrin model compound, indicating that EET takes place between the chromophores within the dendrimers. The experimental TRAMS results were compared to computationally simulated data obtained from the Pauli master equation. For the first generation dendrimer, we find the rate of energy transfer is well described by Forster theory. Anomalous behavior is observed in the third generation dendrimer where the limiting anisotropy value suggests that energy transfer is confined to only the porphyrins contained within a dendron. Interdendron porphyrin EET is thus unfavorable due to dendron segregation. In thefifth generation dendrimer, the TRAMS data is best explained by a model which includes independent and simultaneous rapid EET between porphyrins contained on the surface of the dendrimer sphere and slow EET between porphyrins in adventitious dendrons found probably either outside or inside of the sphere.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/09/20 alle ore 19:19:55