Cheng Feixiang, He Chixian, Ren Mingli, Wang Fan, Yang Yuting
College of Chemistry and Chemical Engineering, Qujing Normal University, Qujing 655011, PR China.
College of Chemistry and Chemical Engineering, Qujing Normal University, Qujing 655011, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2015 Feb 5;136 Pt B:845-51. doi: 10.1016/j.saa.2014.09.103. Epub 2014 Oct 2.
Two dinuclear Ru(II) polypyridyl complexes functionalized with vacant coordination sites have been designed and synthesized. Their photophysical properties and interactions with various metal ions have been investigated at room temperature. The two complexes exhibit different UV/Vis absorption and emission intensities. When titrated with various metal ions, complex {Ru(bpy)2}2(μ2-L(1)) exhibits a notable fluorescence quenching in the presence of Cu(2+) in H2O-CH3CN media (1:1, v/v); its analogous complex {Ru(bpy)2}2(μ2-L(2)) exhibits no cation selectivity, the fluorescence intensity of complex {Ru(bpy)2}2(μ2-L(2)) has been enhanced by several transition metal ions due to prevention of the photo-induced electron transfer process. The fluorescence titration spectra and Benesi-Hildebrand expression reveal the formation of a 1:1 bonding mode between {Ru(bpy)2}2(μ2-L(1)) and Cu(2+) ion with the association constant of 5.50×10(4) M(-1).
设计并合成了两种带有空配位位点的双核Ru(II)多吡啶配合物。在室温下研究了它们的光物理性质以及与各种金属离子的相互作用。这两种配合物表现出不同的紫外/可见吸收和发射强度。在用各种金属离子滴定过程中，配合物{Ru(bpy)2}2(μ2-L(1))在H2O-CH3CN介质（1:1，v/v）中存在Cu(2+)时表现出显著的荧光猝灭；其类似配合物{Ru(bpy)2}2(μ2-L(2))没有阳离子选择性，由于光诱导电子转移过程的抑制，{Ru(bpy)2}2(μ2-L(2))配合物的荧光强度被几种过渡金属离子增强。荧光滴定光谱和贝内西-希尔德布兰德表达式揭示了{Ru(bpy)2}2(μ2-L(1))与Cu(2+)离子之间形成了1:1的键合模式，缔合常数为5.50×10(4) M(-1)。
