184014-74-2Relevant articles and documents
Structure and properties of carbonyl-coordinated ruthenium(II) and osmium(II) porphyrin dimers bridged by aza ligands
Bando, Chika,Furukawa, Atsushi,Tsuge, Kiyoshi,Takaishi, Kazumi,Sasaki, Yoichi,Imamura, Taira
, p. 1955 - 1964 (2009/07/30)
Carbonyl-coordinated ruthenium(II) and osmium(II) porphyrin dimers bridged with aza ligands, [{M(por)-(CO)}2](BL), (M = RuII, Os II; por = ttp (5,10,15,20-tetra-p-tolylporphyrinato dianion), oep (2,3,7,8,12,13,17,18-octa-ethylporphyrinato dianion); BL = pz (pyrazine), bpy (4,4′-bipyridine), dabco (l,4-diazabicyclo[2,2,2]octane)), were prepared and characterized, and their structures were determined by using single-crystal X-ray crystallography. The metal-metal distances of the pz-, bpy-, and dabco-bridged dimers in [{M(por)(CO)}2(BL)] were about 7.1-7.3, 11.5, and 7.3-7.4 A, respectively. From electrochemical measurements, the first oxidation waves of the ruthenium and osmiumporphyrin dimers with the pz and dabco, except the Ru-oep systems, were split, although the first oxidation in the Rucomplexes occurs at the porphyrin rings and in the Os complexes occurs at the metal centers. The extent of the potential splits at the first oxidation processes, which reflects magnitude of the intramolecular redox interactions, was in the orders: ttp > oep and Os (metal oxidation) > Ru (ring oxidation), and dabco ≥ pz ? bpy.