Trinuclear and Tetranuclear Re(I) Rings Connected with Phenylene, Vinylene, and Ethynylene Chains: Synthesis, Photophysics, and Redox Properties.
A series of highly luminescent trinuclear and tetranuclear ring-shaped Re(I) complexes wherein the Re units are linked with rigid bidentate phosphine ligands, namely, bis(diphenylphosphino)-p-phenylene, -trans-vinylene, and -ethynylene, were synthesized and fully characterized. Their strong emissive properties and the long lifetimes of their triplet metal-to-ligand charge transfer excited states originate primarily from enhanced, rigidity-induced interligand interactions between the 2,2'-bipyridine (bpy) ligand and the phenyl groups of the phosphine ligands. In addition, another type of interligand interaction was also observed between the bpy ligand and the phosphine-bridging group; this interaction also strongly affected the photophysical and redox properties of the Re-rings.
Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology , 2-12-1-NE-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan.|CREST, Japan Science and Technology Agency , 4-1-8 Honcho, Kawaguchi-shi, Saitama 322-0012, Japan.
Jana
J
Rohacova
Department of Chemistry and Material Science, Graduate School of Science and Engineering, Tokyo Institute of Technology , 2-12-1-H60 Ookayama, Meguro-ku, Tokyo 152-8551, Japan.
Akiko
A
Sekine
Department of Chemistry and Material Science, Graduate School of Science and Engineering, Tokyo Institute of Technology , 2-12-1-H60 Ookayama, Meguro-ku, Tokyo 152-8551, Japan.
Tsubasa
T
Kawano
Department of Chemistry and Material Science, Graduate School of Science and Engineering, Tokyo Institute of Technology , 2-12-1-H60 Ookayama, Meguro-ku, Tokyo 152-8551, Japan.
Sho
S
Tamari
Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology , 2-12-1-NE-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan.|CREST, Japan Science and Technology Agency , 4-1-8 Honcho, Kawaguchi-shi, Saitama 322-0012, Japan.
Osamu
O
Ishitani