Chemistry is the science of change. But why do chemical reactions take place? Why do chemicals react with each other? The answer is in thermodynamics and kinetics.In a document type is Article, the author is Cheng, Feixiang and a compound is mentioned, 14098-44-3, Benzo-15-crown-5, introducing its new discovery. 14098-44-3
Preparation, photophysical, electrochemical, and ion-binding properties of Ru(II) polypyridyl complexes containing a crown ether unit
Two polypyridyl ligands, 4′-(4,5-diazafluoren-9-ylimino)benzo-15-crown-5 (L1) and 4′-(4,5-diazafluoren-9-ylimino)benzo-12-crown-4 (L 2), and their Ru(II) complexes [(bpy)2RuL](PF 6)2 and [(bpy)2RuL2](PF 6)2, respectively, have been synthesized and characterized. The two complexes display metal-to-ligand charge transfer absorptions at around 444 nm in CH3CN solution at r. t. and emission at around 573 nm in an EtOH-MeOH (4:1, v/v) glassy matrix at 77 K. Electrochemical studies of the complexes show one Ru(II)-centered oxidation at around 1.33 V and three ligandcentered reductions. The binding ability of the complexes with Na+ and Li+ has been investigated by UV/Vis absorption and emission spectroscopy and electrochemical titrations. Addition of Na+ and Li+ to solutions of the complexes results in a progressive quenching of the emission, a hyperchromic effect of the UV/Vis absorption, and a progressive cathodal shift of the Ru(II)-centered E 1/2 potential. The stability constants for the stoichiometric 1:1 ratio of the complexes and the cations have been obtained by UV/Vis absorption titration.
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Reference£º
Chiral Catalysts,
Chiral catalysts – SlideShare