Synthesis, spectroscopic and electrochemical properties of mononuclear and dinuclear bis(bipy)ruthenium(ii) complexes containing dimethoxyphenyl(pyridin-2-yl)-1,2,4-triazole ligands
作者:Paolo Passaniti、Wesley R. Browne、Fiona C. Lynch、Donal Hughes、Mark Nieuwenhuyzen、Paraic James、Mauro Maestri、Johannes G. Vos
DOI:10.1039/b108728m
日期:——
The ligands HL1 and H2L2 and the complexes [Ru(bipy)2L1]PF6·2H2O 1, [(Ru(bipy)2)2L2](PF6)2·7H2O 2, where HL1
= 3-(2′,5′-dimethoxyphenyl)-5-(pyridin-2″-yl)-1H-1,2,4-triazole, H2L2
= 1,4-bis(5′-(pyridin-2″-yl)-1′H-1′,2′,4′-triazol-3′-yl)-2,5-dimethoxybenzene and bipy = 2,2′-bipyridyl}, have been prepared and characterised, by NMR, UV–vis and emission spectroscopies and by electrochemical measurements. X-Ray crystal structures of ligands HL1, H2L2 and of the complex 1 are also reported. The dinuclear complex (2) exhibits a weak electronic interaction between the metal centres, which is modulated by the protonation state of the 1,2,4-triazole rings. The extent of the metal–metal interaction in these systems is compared with that observed in other pyridyl-1,2,4-triazole based dinuclear compounds of differing metal–metal distances.
配体 HL1 和 H2L2 以及配合物 [Ru(bipy)2L1]PF6-2H2O 1、[(Ru(bipy)2)2L2](PF6)2-7H2O 2,其中 HL1 = 3-(2′、5′-dimethoxyphenyl)-5-(pyridin-2″-yl)-1H-1,2,4-triazole, H2L2 = 1,4-bis(5′-(pyridin-2″-yl)-1′H-1′,2′,4′-三唑-3′-基)-2,5-二甲氧基苯和 bipy = 2,2′-联吡啶},并通过核磁共振、紫外可见光谱、发射光谱和电化学测量进行了表征。此外,还报告了配体 HL1、H2L2 和复合物 1 的 X 射线晶体结构。双核复合物 (2) 的金属中心之间存在微弱的电子相互作用,这种相互作用受 1,2,4- 三唑环质子化状态的影响。我们将这些系统中金属-金属相互作用的程度与在其他不同金属-金属间距的吡啶基-1,2,4-三唑基双核化合物中观察到的程度进行了比较。