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

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)
Research Group:	Medical Cell BioPhysics (MCBP)
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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