Triplet excitation energy transfer in porphyrin-based donor-bridge-acceptor systems with conjugated bridges of varying length: An experimental and DFT study
Journal article, 2006

A series of donor-bridge-acceptor (D-B-A) systems with varying donor-acceptor distances have been studied with respect to their triplet energy transfer properties. The donor and acceptor moieties, zinc(II), and free-base porphyrin, respectively, were separated by 2-5 oligo-p-phenyleneethynylene units (OPE) giving rise to edge-to-edge separations ranging between 12.7 and 33.4 angstrom. The study was performed in 2-MTHF at 150 K and it was established that triplet excitation energy transfer occurs with high efficiency in all of the studied D-B-A systems. The distance dependence was exponential with an attenuation factor, beta, equal to 0.45 +/- 0.015 angstrom(-1). The experimental study was also supported by quantum mechanical DFT and TD-DFT calculations on a series of closely related model systems. A thorough analysis of the OPE-bridge conformational dynamics led to an equation that quantitatively models the distance dependence of the electronic coupling found in the experimental study.

Author

Mattias P Eng

Chalmers, Chemical and Biological Engineering, Physical Chemistry

Thomas Ljungdahl

Chalmers, Chemical and Biological Engineering, Organic Chemistry

Jerker Mårtensson

Chalmers, Chemical and Biological Engineering, Organic Chemistry

Bo Albinsson

Chalmers, Chemical and Biological Engineering, Physical Chemistry

Journal of Physical Chemistry B

1520-6106 (ISSN) 1520-5207 (eISSN)

Vol. 110 13 6483-6491

Subject Categories

Chemical Sciences

DOI

10.1021/jp056536u

More information

Created

10/8/2017