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Issue 17, 1992
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Picosecond generation of transient charge carriers in Langmuir–Blodgett films of semi-amphiphilic heterodimers

Abstract

Langmuir–Blodgett homolayers are formed by deposition of semi-amphiphilic porphyrin–phthalocyanine heterodimers. The optical and photophysical properties of these dimers have been investigated and compared to the liquid-phase data. Excitation of the dimer results in an instantaneous formation of the singlet excited states, followed by a very efficient charge-transfer reaction. The oxidized porphyrin and reduced phthalocyanine moieties are formed within 2 ps and disappear in 70 ps. The triplet excited states of the porphyrin issued from the intersystem crossing decay pathway of the singlet excited states are formed with a very low quantum yield. They also undergo a charge-transfer reaction, leading to the formation of long-lived transient charge carriers. The photoprocesses determined in the Langmuir–Blodgett films of semi-amphiphilic porphyrin–phthalocyanine heterodimers are almost identical to those previously observed for the same dimers in the liquid phase.

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Article type: Paper
DOI: 10.1039/FT9928802529
J. Chem. Soc., Faraday Trans., 1992,88, 2529-2535

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    Picosecond generation of transient charge carriers in Langmuir–Blodgett films of semi-amphiphilic heterodimers

    T. H. Tran-Thi, J. F. Lipskier, D. Houde, C. Pépin, R. Langlois and S. Palacin, J. Chem. Soc., Faraday Trans., 1992, 88, 2529
    DOI: 10.1039/FT9928802529

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