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Synthesis and Photodynamics of Fluorescent Blue BODIPY-Porphyrin Tweezers Linked by Triazole Rings
Ist Teil von
The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, 2012-04, Vol.116 (15), p.3889-3898
Ort / Verlag
United States: American Chemical Society
Erscheinungsjahr
2012
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Novel zinc porphyrin tweezers in which two zinc porphyrins were connected with π-conjugated boron dipyrromethenes (BDP meso-Por2 and BDP β-Por2) through triazole rings were synthesized to investigate the photoinduced energy transfer and electron transfer. The UV–vis spectrum of BDP β-Por2 which has less bulky substituents than BDP meso-Por2 exhibits splitting of the Soret band as a result of the interaction between porphyrins of BDP β-Por2 in the excited state. Such interaction between porphyrins of both BDP β-Por2 and BDP meso-Por2 is dominant at room temperature, while the coordination of the nitrogen atoms of the triazole rings to the zinc ions of the porphyrins occurs at low temperature. The conformational change of the BDP–porphyrin composites was confirmed by the changes in UV–vis and fluorescence spectra depending on temperature. Photodynamics of BDP meso-Por2 and BDP β-Por2 has also been investigated by laser flash photolysis. Efficient singlet–singlet energy transfer from the ZnP to the π-conjugated BDP moiety of both BDP meso-Por2 and BDP β-Por2 occurred in opposite direction as compared to energy transfer from conventional BDP to ZnP due to the π-conjugation in nonpolar toluene. In polar benzonitrile, however, additional electron transfer occurred along with energy transfer.