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Photophysical and photochemical properties of a family of isoelectronic tris chelated ruthenium(II) aza-/azo-aromatic complexes

机译:一族等电子三螯合钌(II)氮杂-/偶氮-芳族配合物的光物理和光化学性质

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We have investigated the electrochemical, spectroscopic and electroluminescent properties of a family of aza-aromatic complexes of ruthenium of type [Ru-II(bpy/phen)(2)(L)](2+) (4d(6)) with three isomeric L ligands, where, bpy = 2,2'-bipyridine, phen = 1,10-phenanthroline and the L ligands are 3-(2-pyridyl) [1,2,4] triazolo[1,5-a] pyridine (L-1), 3-(2-pyridyl[1,2,3]) triazolo[1,5-a] pyridine (L-2) and 2-(2-pyridyl)[1,2,4] triazolo[1,5-a] pyridine (L-3). The complexes display two bands in the visible region near 410-420 and 440-450 nm. The complexes are diamagnetic and show well defined H-1 NMR lines. They are electroactive in acetonitrile solution and exhibit a well defined Ru-II/Ru-III couple near 1.20 to 1.30 V and -1.40 to -1.50 V due to ligand reduction versus Saturated Calomel Electrode (SCE). The solutions are also luminescent, with peaks are near 600 nm. All the complexes are electroluminescent in nature with peaks lying near 580 nm. L-1 and L-3 ligated complexes with two bpy co-ligands show weak photoluminescence (PL) but stronger electroluminescence (EL) compared to corresponding L-2 ligated analogues.
机译:我们研究了[Ru-II(bpy / phen)(2)(L)](2+)(4d(6))型钌的氮杂-芳香族钌配合物家族的电化学,光谱和电致发光性质异构体L配体,其中bpy = 2,2'-联吡啶,phen = 1,10-菲咯啉,L配体为3-(2-吡啶基)[1,2,4]三唑并[1,5-a]吡啶(L-1),3-(2-吡啶基[1,2,3])三唑并[1,5-a]吡啶(L-2)和2-(2-吡啶基)[1,2,4]三唑并[1,5-a]吡啶(L-3)。该络合物在410-420和440-450 nm附近的可见光区显示两个波段。该配合物是抗磁性的,并显示出清晰的H-1 NMR谱线。它们在乙腈溶液中具有电活性,并且由于相对于饱和甘汞电极(SCE)的配体还原作用,在1.20至1.30 V和-1.40至-1.50 V附近显示出良好定义的Ru-II / Ru-III对。该溶液也是发光的,其峰在600nm附近。所有的配合物本质上都是电致发光的,峰位于580 nm附近。与相应的L-2连接的类似物相比,具有两个bpy共配体的L-1和L-3连接的复合物显示出弱的光致发光(PL)但较强的电致发光(EL)。

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