Electric Literature of 15746-57-3. Let’s face it, organic chemistry can seem difficult to learn. Especially from a beginner’s point of view. Like 15746-57-3, Name is Cis-Dichlorobis(2,2′-bipyridine)ruthenium(II). In a document type is Article, introducing its new discovery.
The physical and photophysical properties of a series of monometallic, [Ru(bpy)2(dmb)]2+, [Ru(bpy)2(BPY)]2+, [Ru(bpy)(Obpy)]2+ and [Ru(bpy)2(Obpy)]2+, and bimetallic, [{Ru(bpy)2}2(BPY)]4+ and [{Ru(bpy)2}2(Obpy)]4+, complexes are examined, where bpy is 2,2?-bipyridine, BPY is 4,4?-dimethyl-2,2?-bipyridine, BPY is 1,2-bis(4-methyl-2,2?-bipyridin-4?-yl)ethane, and Obpy is 1,2-bis(2,2?-bipyridin-6-yl)ethane. The complexes display metal-to-ligand charge transfer transitions in the 450 nm region, intraligand pi ? pi* transitions at energies greater than 300 nm, a reversible oxidation of the ruthenium(II) center in the 1.25-1.40 V vs SSCE region, a series of three reductions associated with each coordinated ligand commencing at -1.3 V and ending at ?-1.9V, and emission from a 3MLCT state having energy maxima between 598 and 610 nm. The RuIII/RuII oxidation of the two bimetallic complexes is a single, two one-electron process. Relative to [Ru(bpy)2(BPY)]2+, the RuIII/RuII potential for [Ru(bpy)2(Obpy)]2+ increases from 1.24 to 1.35 V, the room temperature emission lifetime decreases from 740 to 3 ns, and the emission quantum yield decreases from 0.078 to 0.000 23. Similarly, relative to [{Ru(bpy)2}2(BPY)]4+, the RuIII/RuII potential for [{Ru(bpy)2}2(Obpy)]4+ increases from 1.28 to 1.32 V, the room temperature emission lifetime decreases from 770 to 3 ns, and the room temperature emission quantum yield decreases from 0.079 to 0.000 26. Emission lifetimes measured in 4:1 ethanol:methanol were temperature dependent over 90-360 K. In the fluid environment, emission lifetimes display a biexponential energy dependence ranging from 100 to 241 cm-1 for the first energy of activation and 2300-4300 cm-1 for the second one. The smaller energy is attributed to changes in the local matrix of the chromophores and the larger energy of activation to population of a higher energy dd state. Explanations for the variations in physical properties are based on molecular mechanics calculations which reveal that the Ru-N bond distance increases from 2.05 A (from RuII to bpy and BPY) to 2.08 A (from RuII to Obpy) and that the metal-to-metal distance increases from ?7.5 A for [{Ru(bpy)2}2(Obpy)]4+ to ?14 A for [{Ru(bpy)2}2(BPY)4+.
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Reference：
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI