Ru(ii) complexes with N-heterocyclic carbene ligands or terpyridine analogues: synthesis, characterization, and electrochemical and proton-dependent spectrometric properties
作者:Hee-Jun Park、Young Keun Chung
DOI:10.1039/c2dt12283a
日期:——
Four ruthenium(II) complexes, BPT, BPN, BPPT, and BPPN, have been prepared and characterized by 1H NMR, 13C NMR, high resolution mass spectrometry (HRMS), elemental analysis, and X-ray crystallography. All the complexes incorporate a pyridyl unit on the terpyridine-type or N-heterocyclic carbene (NHC) ligand and the pyridyl unit can be protonated upon addition of 1.0 M HCl in diethyl ether. The proton-dependent absorption and luminescence spectrum were measured in CH3CN. In the case of BPT, the λmaxabs was moved by 10 nm from 490 nm to 500 nm after the addition of 12 equiv. of HCl and the intensity of the emission spectrum increased. In contrast, in the case of BPN, the λmaxabs was red-shifted by 43 nm from 424 nm to 467 nm and the emission was dramatically quenched upon the addition of the equiv. of HCl. However, there were no noticeable changes in the λmaxabs values of BPPT and BPPN even after the addition of the HCl to a solution of those complexes. Moreover, BPN has a selective sensing property for a proton among many cations.
四种钌(II)配合物 BPT、BPN、BPPT 和 BPPN 已被合成并通过 ^1H NMR、^13C NMR、高分辨率质谱(HRMS)、元素分析和 X 射线晶体学进行了表征。所有配合物均在其三吡啶型或 N-杂环碳烯(NHC)配体上引入了吡啶基,而在加入 1.0 M HCl 于二乙醚后,吡啶基可以质子化。质子依赖的吸收和发光光谱在 CH3CN 中测量。在 BPT 的情况下,λmaxabs 在添加 12 当量 HCl 后,由 490 nm 移动至 500 nm,且发射光谱的强度增加。相反,在 BPN 的情况下,λmaxabs 从 424 nm 红移 43 nm 到 467 nm,而发射强度在添加相同当量的 HCl 后显著淬灭。然而,BPPT 和 BPPN 在添加 HCl 到这些配合物的溶液后λmaxabs 值并没有明显变化。此外,BPN 对多种阳离子具有选择性感应质子的特性。