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RISS 인기검색어
- 검색키워드
- 저자 : Eggenspiller, Antoine (검색결과 2 건)
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Synthesis and Photodynamicsof Fluorescent Blue BODIPY-PorphyrinTweezers Linked by Triazole Rings
Eggenspiller, Antoine,Takai, Atsuro,El-Khouly, Mohamed E.,Ohkubo, Kei,Gros, ClaudeP.,Bernhard, Claire,Goze, Christine,Denat, Franck,Barbe, Jean-Michel,Fukuzumi, Shunichi AmericanChemical Society 2012 The Journal of physical chemistry A Vol.116 No.15
<P>Novel zinc porphyrin tweezers in which two zinc porphyrins were connected with pi-conjugated boron dipyrromethenes (BDP meso-Por(2) and BDP beta-Por(2)) through triazole rings were synthesized to investigate the photoinduced energy transfer and electron transfer. The UV-vis spectrum of BDP beta-Por(2) which has less bulky substituents than BDP meso-Por(2) exhibits splitting of the Soret band as a result of the interaction between porphyrins of BDP beta-Por(2) in the excited state. Such interaction between porphyrins of both BDP beta-Por(2) and BDP meso-Por(2) 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 beta-Por(2) has also been investigated by laser flash photolysis. Efficient singlet-singlet energy transfer from the ZnP to the pi-conjugated BDP moiety of both BDP meso-Por2 and BDP beta-Por(2) occurred in opposite direction as compared to energy transfer from conventional BDP to ZnP due to the pi-conjugation in nonpolar toluene. In polar benzonitrile, however, additional electron transfer occurred along with energy transfer.</P>
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Takai, Atsuro,Chkounda, Mohammed,Eggenspiller, Antoine,Gros, Claude P.,Lachkar, Mohammed,Barbe, Jean-Michel,Fukuzumi, Shunichi American Chemical Society 2010 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.132 No.12
<P>A novel porphyrin tripod (TPZn<SUB>3</SUB>) was synthesized via “click chemistry”. Three porphyrin moieties of TPZn<SUB>3</SUB> are geometrically close and linked by a flexible linker. The electron-transfer oxidation of TPZn<SUB>3</SUB> results in intramolecular π-dimer formation between porphyrin moieties as indicated by electrochemical, vis−NIR, and ESR measurements. The cyclic voltammogram of TPZn<SUB>3</SUB> exhibited stepwise one-electron oxidation processes of three porphyrin moieties in the range from 0.58 to 0.73 V (vs SCE in CH<SUB>2</SUB>Cl<SUB>2</SUB>). When TPZn<SUB>3</SUB> was oxidized by tris(2,2′-bipyridyl)-ruthenium(III) ([Ru(bpy)<SUB>3</SUB>]<SUP>3+</SUP>), the oxidized species (TPZn<SUB>3</SUB>)<SUP><I>n</I>+</SUP> (0 < <I>n</I> ≤ 3) exhibited a charge resonance band in the NIR region due to the π-dimer formation between porphyrin moieties. A supramolecular electron donor−acceptor system was also constructed using TPZn<SUB>3</SUB>. The flexible conformation of TPZn<SUB>3</SUB> makes it possible to capture a fullerene derivative containing a pyridine moiety (PyC<SUB>60</SUB>) inside the cavity by π−π interactions as well as the coordination bond between Zn<SUP>2+</SUP> and the pyridine moiety. The formation of a 1:1 supramolecular complex of TPZn<SUB>3</SUB> with PyC<SUB>60</SUB> (TPZn<SUB>3</SUB>−PyC<SUB>60</SUB>) was indicated in the UV−vis and <SUP>1</SUP>H NMR spectra in nonpolar solvents. The association constant of TPZn<SUB>3</SUB> with PyC<SUB>60</SUB> (1.1 × 10<SUP>5</SUP> M<SUP>−1</SUP> in toluene) is much larger as compared with those of the corresponding monomer (MPZn) and dimer porphyrin (DPZn<SUB>2</SUB>). The dynamics of photoinduced electron transfer from the singlet excited state of TPZn<SUB>3</SUB> to PyC<SUB>60</SUB> was examined by laser flash photolysis measurements. The efficient intracomplex photoinduced electron transfer in TPZn<SUB>3</SUB>−PyC<SUB>60</SUB> occurred in nonpolar solvents, resulting from the π−π interactions between the porphyrin and fullerene moieties, together with intramolecular π-bond formation between the porphyrin radical cation and the neutral porphyrin in TPZn<SUB>3</SUB><SUP>•+</SUP>.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2010/jacsat.2010.132.issue-12/ja100192x/production/images/medium/ja-2010-00192x_0019.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja100192x'>ACS Electronic Supporting Info</A></P>
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