Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn’t involve a screen. 15746-57-3, C20H16Cl2N4Ru. A document type is Article, introducing its new discovery., Safety of Cis-Dichlorobis(2,2′-bipyridine)ruthenium(II)
The 3,6-bis(2′-pyridyl)pyridazine (dppnH) ligand can be used as a bridging ligand in two different ways: (i) it can coordinate two metal ions on the same side by means of two N-N chelating moieties, or (ii) it can coordinate two metal ions on opposite sides by means of N-N and C~-N chelating moieties, the second one resulting from metallation at the pyridazine ring. We have exploited the latter possibility to prepare the hexanuclear complex [{(bpy)2Ru(/t-dppn)}2Rh(/iCI)2Rh{(/i-dppn)Ru(bpy)2}2]8t (1) as the PFe salt. The preparation of 1 was performed by reacting the mononuclear [Ru(bpy)2(dppnH]2t complex with RhCI3. The novel polynuclear complex 1 contains four Ru(ll)-polypyridine-type peripheral units linked to a core made of two cyclometallated Rh(lll) units bridged by two Cl~ ions. The absorption, emission, and redox properties of 1 have been examined and are compared with the properties displayed by appropriate model compounds. 1 shows absorption bands in the UV and visible spectral regions and a strong phosphorescence band both in solution at room temperature (Amax = 657 nm, $ = 0.038, r = 925 ns) and in a rigid matrix at 77 K (Amax = 632 nm, r = 4.5 p,s), which is assigned to the 3MLCT level of the Ru-based peripheral units. Electrochemical experiments have evidenced an oxidation wave at +1.31 V vs SCE, assigned to the metal-centered oxidation of the four (weakly interacting) Ru-based units. On reduction, a complex pattern of ligand-centered processes is observed, starting with a twoelectron wave at -1.10V, assigned to reduction of the N-N chelating moieties of two remote bridging ligands. The hexanuclear compound 1 is particularly interesting since, by analogy with other Cl~ bridged Rh(lll) cyclometallated complexes, it is expected to undergo cleavage of the Cl~ bridges upon reaction with N-N type chelating ligands. It can therefore be used as a building block for the synthesis of mixed-metal complexes of high nuclearity. ‘ CNRS-Gauthier-Villars.
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Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI