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Volumn 121, Issue 1, 1999, Pages 48-53

Intramolecular electron transfer of diporphyrins comprised of electron- deficient porphyrin and electron-rich porphyrin with photocontrolled isomerization

Author keywords

[No Author keywords available]

Indexed keywords

AZOBENZENE DERIVATIVE; PORPHYRIN DERIVATIVE; ZINC COMPLEX;

EID: 0033550508     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja980677a     Document Type: Article
Times cited : (136)

References (82)
  • 29
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    • note
    • Usual porphyrins are known to be decomposed under strong light. When the halogen atoms are substituted directly on the porphyrin ring itself, their properties including redox potentials change greatly. In particular, fluorinated porphyrins are very robust toward oxidizing agents and light.
  • 30
    • 0345263118 scopus 로고    scopus 로고
    • note
    • 3) δ = -141.
  • 39
    • 0344400260 scopus 로고    scopus 로고
    • note
    • The light with longer wavelength (>440 nm) was cut off by using a Toshiba glass filter (UV-D33S), and then, the region of UV was used for photoirradiation.
  • 40
    • 0344400259 scopus 로고    scopus 로고
    • note
    • All of the experiments of photoirradiation were conducted in acetonitrile, because the decomposition of dichloromethane under Xe lamp irradiation was observed.
  • 41
    • 0345263119 scopus 로고    scopus 로고
    • note
    • 19
  • 45
    • 0345263110 scopus 로고    scopus 로고
    • note
    • The decrease (67%) of fluorescence intensity of the trans-isomer of diporphyrin Zn complex 1 for the monomer 5 is caused from the interaction via the azobenzene linker, while for the cis-isomer, the larger decrease (80%) of fluorescence intensity for the monomer 5 would arise from direct interaction between two porphyrin Zn complexes.
  • 46
    • 0345263114 scopus 로고    scopus 로고
    • note
    • The relative fluorescence intensities of diporphyrin Zn complexes with other β-halogen atoms were measured for comparison purposes. The relative intensities of the cis-isomers of β-brominated diporphyrin Zn complex 16 and β-chlorinated diporphyrin Zn complex 17 were 0.79 and 0.73, respectively. The ratios of fluorescence quenching of these diporphyrin Zn complexes (16, 17) are smaller, suggesting that the electron-transfer interaction may be controlled by both steric and electronic factors of β-halogen atoms on one porphyrin ring. The synthetic methods of Zn complexes (16, 17) were described in the Experimental Section.
  • 47
    • 0345263112 scopus 로고    scopus 로고
    • note
    • When the large overlap between the absorption of UV-visible spectrum and the absorption of fluorescence spectrum exists, there is the possibility that the intramolecular energy transfer occurs.
  • 51
    • 0004214293 scopus 로고
    • Academic Press: New York
    • (c) Dolphin, D., Ed. The Porphyrins; Academic Press: New York, 1978.
    • (1978) The Porphyrins
    • Dolphin, D.1
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    • 0344831724 scopus 로고    scopus 로고
    • note
    • 3f.25a,26.28 This broadening is probably due to intramolecular dipolar-dipolar and exchange interaction among the radicals.
  • 74
    • 0030504688 scopus 로고    scopus 로고
    • The relative fluorescence quantum yields of compounds (1, 2, 5, and 9) were summarized in Table 3. The measurements of the relative fluorescence quantum yields of other diporphyrin Zn complexes and diporphyrins have been tried by using several methods (Ogawa, S.; Tsuchiya, S. Chem. Lett. 1996, 709). The results of these measurements will be published in the future.
    • (1996) Chem. Lett. , pp. 709
    • Ogawa, S.1    Tsuchiya, S.2
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    • Dolphin, D., Ed. The Porphyrins, III; Academic Press: New York, 1978.
    • (1978) The Porphyrins , vol.3
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    • Tsuchiya, S.; Senō, M.; Kawai, M. Jpn. Kokai Tokkyo Koho JP 02250883. (Chem. Abstr. 1991, 115, 79933f). Tsuchiya, S.; Senō, M. Chem. Lett. 1989, 263.
    • (1989) Chem. Lett. , pp. 263
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    • 60 porphyrin = superteflon porphyrin) is expected to have this excellent property; the synthesis of diporphyrin containing this dodecaarylporphyrin is in progress.
    • (1990) Chem. Phys. Lett. , vol.169 , pp. 608
    • Tsuchiya, S.1
  • 80
    • 0001568552 scopus 로고
    • 60 porphyrin = superteflon porphyrin) is expected to have this excellent property; the synthesis of diporphyrin containing this dodecaarylporphyrin is in progress.
    • (1991) J . Chem. Soc., Chem. Commun. , pp. 716
  • 81
    • 0001568552 scopus 로고
    • 60 porphyrin = superteflon porphyrin) is expected to have this excellent property; the synthesis of diporphyrin containing this dodecaarylporphyrin is in progress.
    • (1992) J . Chem. Soc., Chem. Commun. , pp. 1475
  • 82
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    • note
    • -1. The syntheses of Zn complexes (18, 19) of tetrakisphenylporphyrin dimer with an azo linkage at the 2′ or 4′ positions of the phenyl moiety at the meso position were conducted, and similar values of v(NN) were obtained. Diporphyrin Zn complexes (3, 16, 17) gave satisfactory elemental analyses for C, H, and N and parent peaks in the mass spectrum in agreement with the calculated values.


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