Tris(porphyrinyl-oxinato)Ga Complexes as a Photosynthetic Antenna Miniature |
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| Authors: | Yoshiaki Kobuke Hidekazu Miyaji Kazuya Ogawa |
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| Institution: | 1. Graduate School of Materials Science , Nara Institute of Science and Technology , 8916-5 Takayama, Ikoma , 630-0101 , Japan;2. CREST, The Japan Science and Technology (JST) Corporation , Shizuoka University , 3-5-1 Johoku, Hamamatsu , 432-8561 , Japan;3. Faculty of Engineering , Shizuoka University , 3-5-1 Johoku, Hamamatsu , 432-8561 , Japan;4. Graduate School of Materials Science , Nara Institute of Science and Technology , 8916-5 Takayama, Ikoma , 630-0101 , Japan |
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| Abstract: | Two oxinylporphyrins, 5-(8-hydroxy-5-quinolinyl)-10,15,20-( p -tolyl)- porphyrin ( 1 ) and 5,15-bis(8-hydroxy-5-quinolinyl)-10,20-bis( n -heptyl)-porphyrin ( 2 ), were prepared and coordinated with Ga(III) to afford tris(oxinato) complex 3 and poly(oxinato) complex 4 , respectively. The structure of 3 was analyzed by variable temperature NMR study with referring to tris(8-hydroxy-5-quinolinyl)Ga(III) complex 5 to be in a meridional form. Oxinato ligands of 3 and 5 were exchanged with one another, with keeping the meridional structure. UV-Vis and fluorescence spectra of tris(oxinato)complex 3 and poly(oxinato)complex 4 were compared with each monomeric compound 1 and 2 . The absorption spectra showed only a slight broadening of the Soret band, suggesting trivial electronic and excitonic interactions. The fluorescence intensity was increased significantly compared with each monomeric compound 1 and 2 . At the same time, efficient excitation energy transfer among three porphyrins has been observed. |
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| Keywords: | Oxine Complexation Antenna Porphyrins |
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