Intermolecular interaction of photoexcited Cu(TMpy-P4) with water studied by transient resonance Raman and picosecond absorption spectroscopies

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Kruglik, Sergei G. and Ermolenkov, Vladimir V. and Shvedko, Alexander G. and Orlovich, Valentine A. and Galievsky, Victor A. and Chirvony, Vladimir S. and Otto, Cees and Turpin, Pierre-Yves (1997) Intermolecular interaction of photoexcited Cu(TMpy-P4) with water studied by transient resonance Raman and picosecond absorption spectroscopies. Chemical Physics Letters, 270 (3-4). pp. 293-298. ISSN 0009-2614

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Abstract: photoinduced complex between Cu(TMpy-P4) and water molecules, reversibly axially coordinated to the central metal, was observed in picosecond transient absorption and nanosecond resonance Raman experiments. This complex is rapidly created (τ1 = 15 ± 5 ps) in the excited triplet (π, π*) state of Cu-porphyrin, and the subsequent relaxation is proposed to proceed via two parallel pathways. One is fast and efficient (≥90% of molecules), and presumably involves a (π, d) charge-transfer state. The second pathway is slow (τ2 >> 1 ns), has a low quantum yield (≤10%) and involves the excited (d, d) state which is responsible for transient Raman features at ≈ 1553 cm−1 (ν2*) and ≈ 1347 cm−1 (ν4*), and for low-intensity long-lived transient absorption features.
Item Type:Article
Copyright:© 1997 Elsevier Science
Faculty:
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/24512
Official URL:http://dx.doi.org/10.1016/S0009-2614(97)00362-X
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