Cookies Policy

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.

I accept this policy

Find out more here

Intramolecular Energy Transfer in a Protoporphyrin-(Anthracene)2 Triad#

No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.

Brill’s MyBook program is exclusively available on BrillOnline Books and Journals. Students and scholars affiliated with an institution that has purchased a Brill E-Book on the BrillOnline platform automatically have access to the MyBook option for the title(s) acquired by the Library. Brill MyBook is a print-on-demand paperback copy which is sold at a favorably uniform low price.

This Article is currently unavailable for purchase.
Add to Favorites
You must be logged in to use this functionality

Cover image Placeholder

(H2)P-An2, a molecular triad in which protoporphyrin(IX) has been covalently linked, through ester bridges at the two propionate side chains, to two anthracene donor subunits has been synthesized and fully characterized by FAB-MS, UV-Visible and 1H NMR spectroscopic methods. A comparison of the UV-Visible and 1H NMR features of (H2)P-An2 with those of the corresponding individual model compounds (i.e. protoporphyrin(IX) dimethyl ester, H2P and anthracene, An) reveal the presence of weak intramolecular ground-state interaction between the porphyrin and anthracene πplanes. Quenching of fluorescence due to anthracene (but not porphyrin) part of the molecule has been observed in three different solvents. Excitation spectral data provides evidence for an intramolecular excitation energy transfer (EET) from the singlet anthracene to the porphyrin. Detailed analysis of the data suggests that Forster's dipole-dipole mechanism does not adequately explain this energy transfer but, an electron exchange mediated mechanism can, in principle, contribute to the intramolecular EET. The bi-exponential fluorescence decay observed in the time-resolved studies has been interpreted in terms of the co-existence of "folded" and "extended" conformers of the molecule in solution. Finally, a comparison is made of the EET reactions of (H2)P-An2 with those observed for the previously reported porphyrin-based energy/electron transfer systems which include (tetraaryl)porphyrin-based isomeric porphyrin-anthracene dyads and mesoporphyrin-based porphyrin-nitrobenzyl diester triads.

Affiliations: 1: School of Chemistry, University of Hyderabad, Hyderabad 500 046, INDIA


Full text loading...


Data & Media loading...

Article metrics loading...



Can't access your account?
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation