Synthesis and photophysics of one mononuclear Mn(III) and one dinuclear Mn(III,III) complex covalently linked to a ruthenium(II) tris(bipyridyl) complex.
The preparation of donor (D)-photosensitizer (S) arrays, consisting of a manganese complex as D and a ruthenium tris(bipyridyl) complex as S has been pursued. Two new ruthenium complexes containing coordinating sites for one (2a) and two manganese ions (3a) were prepared in order to provide models for the donor side of photosystem II in green plants. The manganese coordinating site consists of bridging and terminal phenolate as well as terminal pyridyl ligands. The corresponding ruthenium-manganese complexes, a manganese monomer 2b and dimer 3b, were obtained. For the dimer 3b, our data suggest that intramolecular electron transfer from manganese to photogenerated ruthenium(III) is fast, k(ET) > 5 x 10(7) s(-)(1).
Johansson
Anh
A
Department of Organic Chemistry, Stockholm University, S-106 91 Stockholm, Sweden.
Abrahamsson
Malin
M
Magnuson
Ann
A
Huang
Ping
P
Mårtensson
Jerker
J
Styring
Stenbjörn
S
Hammarström
Leif
L
Sun
Licheng
L
Akermark
Björn
B