Journal
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
Volume 7, Issue 12, Pages 1509-1521Publisher
SPRINGERNATURE
DOI: 10.1039/b813737d
Keywords
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Funding
- FWO, the Flemish Ministry of Education [GOA 2001/02, 2006/2]
- BMBF, the Federal Science Policy of Belgium [IAP-V-03, IAP VI-27]
- IWT [04/007]
- Belgian National Fund for Scientific Research (FNRS/FRFC)
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A detailed investigation of the photophysical properties of a series of perylenediimide systems bearing three different types of bay substituents is presented. Single photon timing and femtosecond transient absorption experiments reveal that the dynamics of interconversion between two conformational arrangements of these substituents occurs with a time constant of 550 ps. In addition, charge transfer from the electron-rich units attached to the bay area of the electron-poor perylenediimide core is observed. This process leads to a fast non-radiative deactivation of the locally excited state of the perylenediimide in polar solvents. When the experimental results of the investigated systems are compared we observe a shift from a conformational dynamics towards competitive excited state processes involving charge transfer in the -meta and -para substituted perylenediimide chromophore.
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