Light-Driven Tyrosine Radical Formation in a Ruthenium-Tyrosine Complex Attached to Nanoparticle TiO2
(2002) In Inorganic Chemistry 41(24). p.6258-6266- Abstract
- We demonstrate a possibility of multistep electron transfer in a supramolecular complex adsorbed on the surface of nanocrystalline TiO2. The complex mimics the function of the tyrosineZ and chlorophyll unit P680 in natural photosystem II (PSII). A ruthenium(II) tris(bipyridyl) complex covalently linked to a L-tyrosine ethyl ester through an amide bond was attached to the surface of nanocrystalline TiO2 via carboxylic acid groups linked to the bpy ligands. Synthesis and characterization of this complex are described. Excitation (450 nm) of the complex promotes an electron to a metal-to-ligand charge-transfer (MLCT) excited state, from which the electron is injected into TiO2. The photogeneration of Ru(III) is followed by an intramolecular... (More)
- We demonstrate a possibility of multistep electron transfer in a supramolecular complex adsorbed on the surface of nanocrystalline TiO2. The complex mimics the function of the tyrosineZ and chlorophyll unit P680 in natural photosystem II (PSII). A ruthenium(II) tris(bipyridyl) complex covalently linked to a L-tyrosine ethyl ester through an amide bond was attached to the surface of nanocrystalline TiO2 via carboxylic acid groups linked to the bpy ligands. Synthesis and characterization of this complex are described. Excitation (450 nm) of the complex promotes an electron to a metal-to-ligand charge-transfer (MLCT) excited state, from which the electron is injected into TiO2. The photogeneration of Ru(III) is followed by an intramolecular electron transfer from tyrosine to Ru(III), regenerating the photosensitizer Ru(II) and forming the tyrosyl radical. The tyrosyl radical is formed in less than 5 s with a yield of 15%. This rather low yield is a result of a fast back electron transfer reaction from the nanocrystalline TiO2 to the photogenerated Ru(III). (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/124774
- author
- Ghanem, Raed LU ; Xu, Yunhua ; Pan, Jie LU ; Hoffman, Tobias ; Andersson, Johan LU ; Polivka, Tomas LU ; Pascher, Torbjörn LU ; Styring, Stenbjörn LU ; Sun, Licheng and Sundström, Villy LU
- organization
- publishing date
- 2002
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Inorganic Chemistry
- volume
- 41
- issue
- 24
- pages
- 6258 - 6266
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- pmid:12444768
- wos:000179540200019
- scopus:0037010955
- ISSN
- 1520-510X
- DOI
- 10.1021/ic020472+
- language
- English
- LU publication?
- yes
- id
- e6edabfb-c158-41de-89aa-a1fcccc33b5b (old id 124774)
- date added to LUP
- 2016-04-01 11:47:02
- date last changed
- 2022-01-26 18:07:59
@article{e6edabfb-c158-41de-89aa-a1fcccc33b5b,
abstract = {{We demonstrate a possibility of multistep electron transfer in a supramolecular complex adsorbed on the surface of nanocrystalline TiO2. The complex mimics the function of the tyrosineZ and chlorophyll unit P680 in natural photosystem II (PSII). A ruthenium(II) tris(bipyridyl) complex covalently linked to a L-tyrosine ethyl ester through an amide bond was attached to the surface of nanocrystalline TiO2 via carboxylic acid groups linked to the bpy ligands. Synthesis and characterization of this complex are described. Excitation (450 nm) of the complex promotes an electron to a metal-to-ligand charge-transfer (MLCT) excited state, from which the electron is injected into TiO2. The photogeneration of Ru(III) is followed by an intramolecular electron transfer from tyrosine to Ru(III), regenerating the photosensitizer Ru(II) and forming the tyrosyl radical. The tyrosyl radical is formed in less than 5 s with a yield of 15%. This rather low yield is a result of a fast back electron transfer reaction from the nanocrystalline TiO2 to the photogenerated Ru(III).}},
author = {{Ghanem, Raed and Xu, Yunhua and Pan, Jie and Hoffman, Tobias and Andersson, Johan and Polivka, Tomas and Pascher, Torbjörn and Styring, Stenbjörn and Sun, Licheng and Sundström, Villy}},
issn = {{1520-510X}},
language = {{eng}},
number = {{24}},
pages = {{6258--6266}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Inorganic Chemistry}},
title = {{Light-Driven Tyrosine Radical Formation in a Ruthenium-Tyrosine Complex Attached to Nanoparticle TiO2}},
url = {{http://dx.doi.org/10.1021/ic020472+}},
doi = {{10.1021/ic020472+}},
volume = {{41}},
year = {{2002}},
}