Relationship between two-photon absorption and the π-conjugation pathway in porphyrin arrays through dihedral angle control

Journal of the American Chemical Society

Volumn 128, Issue 5, 2006, Pages 1700-1704

  Ahn, Tae Kyu ^a   Kim, Kil Suk ^a   Kim, Deok Yun ^a   Noh, Su Bum ^a   Aratani, Naoki ^b   Ikeda, Chusaku ^b   Osuka, Atsuhiro ^b   Kim, Dongho ^a  

^a Yonsei University   (South Korea)

^b KYOTO UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

ABSORPTION; CHEMICAL BONDS; CORRELATION METHODS; DIMERS; PHOTONS;

AROMATICITY; TWO PHOTON ABSORPTION;

PORPHYRINS;

PORPHYRIN;

ARTICLE; CHEMICAL STRUCTURE; CONJUGATION; CORRELATION ANALYSIS; LIGHT ABSORPTION; STRUCTURE ANALYSIS; TWO PHOTON ABSORPTION;

EID: 32344451954     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja056773a     Document Type: Article

References (19)

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2. fi.
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12. It is possible that three or more consecutive Zn(II) porphyrins are each ligated with one 1,7-DA, although the probability is low. As Zn(II) porphyrins in the ZN array are each ligated with one 1,7-DA, the bathochromic shift in absorption spectra should be small (∼5 nm), as illustrated by the coordination with pyridine. Thus, much larger red-shifted absorption, as shown in the absorption spectra of 1,7-DA:ZN (SI, Figure S7), indicate that there are simultaneously coordinated Zn(II) porphyrin dimer units by 1,7-DA in ZN porphyrin arrays. Thus, the combination of the dilution effect by non- or mono-coordinated Zn(II) porphyrins and the orthogonality between the two bis-coordinated Zn(II) porphyrin dimer units would reduce the TPA values. In any cases, the prohibition of π-conjugation by the orthogonality between Zn(II) porphyrin moieties plays a major role in reducing the TPA values.
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