Premium
Covalently Linked Ruthenium(II)−Manganese(II) Complexes: Distance Dependence of Quenching and Electron Transfer
Author(s) -
Berg Katja E.,
Tran Anh,
Raymond Mary Katherine,
Abrahamsson Malin,
Wolny Juliusz,
Redon Sophie,
Andersson Mikael,
Sun Licheng,
Styring Stenbjörn,
Hammarström Leif,
Toftlund Hans,
Åkermark Björn
Publication year - 2001
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200104)2001:4<1019::aid-ejic1019>3.0.co;2-6
Subject(s) - chemistry , manganese , ruthenium , electron transfer , quenching (fluorescence) , photochemistry , flash photolysis , covalent bond , ligand (biochemistry) , photoinduced electron transfer , electron paramagnetic resonance , cyclic voltammetry , inorganic chemistry , electrochemistry , fluorescence , catalysis , reaction rate constant , kinetics , organic chemistry , electrode , biochemistry , physics , quantum mechanics , receptor , nuclear magnetic resonance
Continuing our development of artificial models for photosystem II in green plants, a series of compounds have been prepared in which a Ru(bpy) 3 2+ photosensitizer is covalently linked to a manganese(II) electron donor. In addition to a trispicolylamine ligand, two other manganese ligands, dipicolylamine and aminodiacetic acid, have been introduced in order to study ligands that are appropriate for the construction of manganese dimers with open coordination sites for the binding of water. Coordination equilibria of the manganese ions were monitored by EPR. The interactions between the ruthenium and manganese moieties were probed by flash photolysis, cyclic voltammetry and steady‐state and time‐resolved emission measurements. The quenching of the Ru II excited state by Mn II was found to be rapid in complexes with short Ru−Mn distances. Nevertheless, each Ru II species could be photo‐oxidized by bimolecular quenching with methylviologen, and the subsequent electron transfer from Mn II to Ru III could be monitored.