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Organometallic Rhodium( III ) Complexes as Catalysts for the Photoreduction of Protons to Hydrogen on Colloidal TiO 2
Author(s) -
Kölle Ulrich,
Grützel Michael
Publication year - 1987
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.198705671
Subject(s) - rhodium , radiolysis , chemistry , catalysis , cyclic voltammetry , platinum , colloid , ligand (biochemistry) , photochemistry , absorption (acoustics) , inorganic chemistry , absorption spectroscopy , hydrogen , aqueous solution , materials science , electrochemistry , organic chemistry , biochemistry , receptor , physics , electrode , composite material , quantum mechanics
The photoreduction of H + to H 2 by sunlight and colloidal TiO 2 in the presence of the rhodium(III) complexes 1 (ppy = oligopyridine ligand, e.g., bipyridyl; L=H 2 O, Cl ⊖ , Br ⊖ , I ⊖ ; n = 1, 2) is possible without the participation of colloidal platinum and is not restricted to alkaline solution. The complexes are thereby reduced, via the Rh II stage, to Rh I complexes, which then undergo transformation to the Rh III complexes with evolution of hydrogen. The course of the reaction was investigated by cyclic voltammetry and pulse radiolysis as well as by transient absorption spectroscopy.