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MO: Fachverband Molekülphysik

MO 17: Stossprozesse, Energietransfer 2

MO 17.2: Talk

Wednesday, March 4, 2009, 16:45–17:00, VMP 6 HS-G

Host-guest porphyrin-phthalocyanine self-assembled supramolecules as artificial photosynthetic system — •Roel Menting¹, Eugeny Ermilov^1,3, Janet Lau², Dennis Ng², and Beate Röder¹ — ¹Institut für Physik, Photobiophysik, Humboldt-Universität zu Berlin, Newtonstr. 15, D-12489 Berlin — ²Department of Chemistry and Centre of Novel Functional Molecules, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China — ³Institut für Physiologie, Campus Benjamin Franklin, Charité * Universitätsmedizin Berlin, Arnimallee 22, D-14195 Berlin

Complexes of porphyrins and phthalocyanines are well suited for modeling both the electron and energy transfer processes in photosynthetic reaction centers.

We used supramolecular approach to build hetero-arrays of beta-cyclodextrin-conjugated silicon phthalocyanine (CD-Pc) with CD-conjugated silicon subphthalocyanine (CD-subPc) and tetrasulfate porphine (TPPS) by host-guest interactions. The absorption of resulting 1:1:1 supramolecular complex covers a broad region of the solar spectrum starting from 350 nm and up to 700 nm. By means of steady-state and time-resolved optical spectroscopy it was found that the photophysical properties of these supramolecules are strongly affected by two different types of interactions between their parts, namely photoinduced charge transfer (CT) and excitation energy transfer (EET). The efficacy of these processes in population/depopulation dynamics of TPPS, CD-Pc and CD-subPc excited states after light absorption is discussed.