Rapid energy transfer process through Delta p-conjugation network in meta -linked branching dendrimers

• Published in: Physica status solidi. C Vol. 8; no. 1; pp. 155 - 158
• Main Authors: Akai, Ichiro, Miyanari, Kuniaki, Shimamoto, Tomoshige, Fujii, Atsuhiro, Kimura, Mutsumi
• Format: Journal Article
• Language: English
• Published: 01.01.2011
• Subjects: Antennas; Bands; Dendrimers; Energy transfer; Excitation; Solid state physics; Torsional vibration; Vibration
• ISSN: 1610-1642
• DOI: 10.1002/pssc.201000638

We investigated rapid energy transfer (ET) processes in dendrimers having meta -linked branching light harvesting antennas. It was found that, at room temperature (RT), the rapid ET occurs efficiently from the antennas to the core and gives rise to intense core-PL bands under the selective excitation on the antenna. However, the ET efficiency impairs at lower temperatures than ~100 K. For understanding these experimental results, we analyzed molecular vibrations and molecular orbitals (MOs) of a simple model molecule. From these analyses, it was demonstrated that, at RT, the torsional vibration of the entire antenna subunit is excited sufficiently and the torsional vibration improves the co-planarity between the core and the antenna subunit, consequently, the rapid ET is realized by the short-range interaction between the Delta *p*-MOs of the core and the antenna. ([copy 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)