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Volumn 14, Issue 19, 1998, Pages 5335-5338

Chain length effect on photocurrent from polymethylene-linked porphyrins in self-assembled monolayers

Author keywords

[No Author keywords available]

Indexed keywords

ABSORPTION SPECTROSCOPY; CYCLIC VOLTAMMETRY; ELECTROCHEMISTRY; ELECTRODES; GOLD; INTERFACES (MATERIALS); MOLECULAR STRUCTURE; PHOTOCHEMICAL REACTIONS; PHOTOCURRENTS; PLATINUM; PORPHYRINS;

EID: 0032164178     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la980351f     Document Type: Article
Times cited : (106)

References (53)
  • 40
    • 85088669776 scopus 로고    scopus 로고
    • note
    • +).
  • 41
    • 11644324810 scopus 로고    scopus 로고
    • note
    • The sold electrode was prepared by vacuum deposition technique with 2000 Å thickness of gold on Si(100) wafer precoated with 50 Å of chromium. Atomic force microscopy (AFM) and X-ray diffraction studies showed that the gold electrode has (111) surface mainly with roughness factor of 1.1.
  • 42
    • 11644323907 scopus 로고    scopus 로고
    • note
    • UV-visible absorption measurements were made using a Hitachi U-3500 spectrometer at reflection mode. The time profile of amount of the adsorbed molecules on the Au substrate was monitored using the UV-visible absorption spectroscopy.
  • 47
    • 85088669538 scopus 로고    scopus 로고
    • note
    • 4.2b, c
  • 48
    • 11644320825 scopus 로고    scopus 로고
    • note
    • 3bThus, coverage is a low limit estimate, and occupied area is an upper limit estimate. Considering that the porphyrins are planar large molecules with bulky substituents at the memo positions, even in the densely packed monolayer films the electrochemical accessibility may be similar to that in the ideal system where surface-confined redox-active molecules are completely electrochemically accessible in the film.
  • 49
    • 12044252133 scopus 로고
    • Surface coverage of 1e/Au estimated using UV-visible absorption spectroscopy as well as cyclic voltammetry deviates slightly from the continuous trend with an increase of the chain length. This may be related to the orientation of the terminal porphyrin where the number of methylene is even or odd. A similar effect has been observed in self-assembled monolayers with a terminal methyl group. Reflectance Fourier transform infrared spectroscopic experiments as well as atomic force microscopy and scanning tunneling microscopy are in progress to establish the molecular orientation, (a) Walczak, M. M.; Chung, C.; Stole, S. M.; Widrig, C. A.; Porter, M. D. J. Am. Chem. Soc. 1991, 113, 2370. (b) Bryant, M. A.; Pemberton, J. E. J. Am. Chem. Soc. 1991, 113, 8284.
    • (1991) J. Am. Chem. Soc. , vol.113 , pp. 2370
    • Walczak, M.M.1    Chung, C.2    Stole, S.M.3    Widrig, C.A.4    Porter, M.D.5
  • 50
    • 0343033364 scopus 로고
    • Surface coverage of 1e/Au estimated using UV-visible absorption spectroscopy as well as cyclic voltammetry deviates slightly from the continuous trend with an increase of the chain length. This may be related to the orientation of the terminal porphyrin where the number of methylene is even or odd. A similar effect has been observed in self-assembled monolayers with a terminal methyl group. Reflectance Fourier transform infrared spectroscopic experiments as well as atomic force microscopy and scanning tunneling microscopy are in progress to establish the molecular orientation, (a) Walczak, M. M.; Chung, C.; Stole, S. M.; Widrig, C. A.; Porter, M. D. J. Am. Chem. Soc. 1991, 113, 2370. (b) Bryant, M. A.; Pemberton, J. E. J. Am. Chem. Soc. 1991, 113, 8284.
    • (1991) J. Am. Chem. Soc. , vol.113 , pp. 8284
    • Bryant, M.A.1    Pemberton, J.E.2
  • 51
    • 11644252090 scopus 로고    scopus 로고
    • note
    • The free energy change from the singlet and triplet excited states to the charge-separated states were calculated to be 0.21 and -0.25 eV, respectively. No corrections have been made for any Coulombic effects because it is difficult to assess the effect at the interface.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.