Zobrazeno 1 - 9
of 9
pro vyhledávání: '"Visa Vehmanen"'
Autor:
Nikolai V. Tkachenko, Ralf-Johan Lamminmäki, Saila Karvinen, Helge Lemmetyinen, Visa Vehmanen, Miia Salmi
Publikováno v:
Journal of Photochemistry and Photobiology A: Chemistry. 175:8-14
The transient absorption properties of TiO 2 particles were studied by femtosecond transient absorption spectroscopy. For the transition metal (Cr and/or Fe)-doped samples the transient absorption spectra were observed to shift to the shorter wavelen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b0c5cd6c81a363055a743b3f18d987a6
https://doi.org/10.1016/j.jphotochem.2005.03.022
https://doi.org/10.1016/j.jphotochem.2005.03.022
Autor:
Ralf-Johan Lamminmäki, Visa Vehmanen, Nikolai V. Tkachenko, Helge Lemmetyinen, Miia Salmi, Saila Karvinen
Publikováno v:
Journal of Photochemistry and Photobiology A: Chemistry. 163:395-401
The transient absorption properties of TiO2 nanocrystalline anatase powder samples calcinated at different temperatures were studied by femtosecond diffuse reflectance spectroscopy. The measurements were performed in TiO2 aqueous suspensions in the p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3d8cffc06017e540ffc737ee193da362
https://doi.org/10.1016/j.jphotochem.2004.01.009
https://doi.org/10.1016/j.jphotochem.2004.01.009
Autor:
Nikolai V. Tkachenko, Visa Vehmanen, Hiroko Yamada, Helge Lemmetyinen, Juha-Pekka Nikkanen, Hiroshi Imahori, Shunichi Fukuzumi
Publikováno v:
Chemical Physics Letters. 366:245-252
A porphyrin–fullerene covalently linked dyad is studied in solutions and Langmuir–Blodgett (LB) films. The dyad is characterized by a relatively long linker. In benzonitrile, it performs a relatively slow photo-induced electron transfer (ET), k E
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a0400d5db4c7e68322dd8fd26b1f61da
https://doi.org/10.1016/s0009-2614(02)01592-0
https://doi.org/10.1016/s0009-2614(02)01592-0
The Role of the Exciplex State in Photoinduced Electron Transfer of Phytochlorin−[60]Fullerene Dyads
Autor:
and Ari Ivaska, Alexander Efimov, Visa Vehmanen, Nikolai V. Tkachenko, Pia Damlin, Helge Lemmetyinen
Publikováno v:
The Journal of Physical Chemistry A. 106:8029-8038
The photoinduced electron transfer (ET) in five structurally different phytochlorin-fullerene dyads was studied in polar and nonpolar solvents using femtosecond fluorescence up-conversion and pump−probe transient-absorption techniques. Small change
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4b359961fe5eb9ecee35034180b0a7c7
https://doi.org/10.1021/jp0260595
https://doi.org/10.1021/jp0260595
Autor:
Shunichi Fukuzumi, Hiroshi Imahori, Visa Vehmanen, Nikolai V. Tkachenko, Tero Kesti, Hiroko Yamada, Helge Lemmetyinen
Publikováno v:
Journal of the American Chemical Society. 124:8067-8077
The photoinduced electron transfer in differently linked zinc porphyrin-fullerene dyads and their free-base porphyrin analogues was studied in polar and nonpolar solvents with femto- to nanosecond absorption and emission spectroscopies. A new interme
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5a8871b16eed5b4b10478783d9455744
https://doi.org/10.1021/ja0257772
https://doi.org/10.1021/ja0257772
Publikováno v:
Chemical Physics Letters. 345:213-218
A femtochemistry study has been performed on two phytochlorin–[60]fullerene donor–acceptor dyads, in which the fullerene moiety is linked via a pyrrolidine bridge either to the position 3 or 7 of the phytochlorin ring. Both dyads form an emissive
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c45ac654c5e9dccccf40133eb4558ef8
https://doi.org/10.1016/s0009-2614(01)00911-3
https://doi.org/10.1016/s0009-2614(01)00911-3
Autor:
Shunichi Fukuzumi, Nikolai V. Tkachenko, Visa Vehmanen, Koichi Tamaki, Hiroshi Imahori, Helge Lemmetyinen, Yoshiteru Sakata
Publikováno v:
The Journal of Physical Chemistry A. 105:1750-1756
Both charge-transfer absorption and emission have been observed in porphyrin-linked fullerene where the C60 moiety is closely located on the porphyrin plane. Electron-transfer parameters including reorganization energies, free energy changes, and ele
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::874ec06070e56f687a0055f381c6f00a
https://doi.org/10.1021/jp003207n
https://doi.org/10.1021/jp003207n
Autor:
Visa Vehmanen, Tero Kesti, Alexandre Efimov, Helge Lemmetyinen, Susanna Mörsky, Nikolay V. Tkachenko
Publikováno v:
Journal of Materials Chemistry. 10:2283-2288
Langmuir–Blodgett films containing 1 mol% 5,10,15,20-tetrakis(3,5-di-tert-butylphenyl)porphyrin (TBP) and its zinc(II) complex (ZnTBP) in a suitable matrix were prepared in an attempt to build a molecular-scale device capable of vectorial photoindu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ea0e7d3818b5bcc23a3ee435cc2fd879
https://doi.org/10.1039/b002797i
https://doi.org/10.1039/b002797i
Publikováno v:
Tampere University
Scopus-Elsevier
Scopus-Elsevier
Molecular systems capable of photoinduced vectorial electron transfer (ET) were assembled using the Langmuir-Blodgett technique. The active part of the systems consisted of phytochlorin-fullerene donor-acceptor layers and polythiophene secondary dono
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9bccaee1cf0d283358e30cdd3c6c8073
https://researchportal.tuni.fi/en/publications/5b0de502-f10b-48e0-a24c-99dea01b2450
https://researchportal.tuni.fi/en/publications/5b0de502-f10b-48e0-a24c-99dea01b2450
