新型两亲性混配钌配合物的合成及其对Hg2+的选择性“肉眼”识别

采用与文献不同的路线合成了4,4′-二(p-甲基苯基)-2,2′-二联吡啶,与文献结果相比,总收率由4.0%提高至15.3%.该化合物和4,4′-二羧基-2,2′-二联吡啶组成混合配体与金属钌配位,合成了两亲性、混配型配合物cis-N,N-4,4′-二(p-甲基)苯基-2,2′-二联吡啶-N,N-4,4′-二羧基-2,2′-二联吡啶-N,N-二异硫氰钌配合物,并用IR,UV-Vis,NMR和Maldi-TOF等手段进行表征.将该两亲性混配钌配合物首次用于对Hg2+的识别中,发现此配合物对Hg2+表现出灵敏的选择性“肉眼”识别:在DMF/乙醇溶液(体积比1∶9)中加入Hg2+后,MLCT态吸收由530nm蓝移到485nm.该配合物与Hg2+以1∶1(摩尔比)结合,检测限可低至0.5×10-6mol/L.

Synthesis of New Mixed-ligands Amphiphilic Ruthenium Complex and Its Naked-eye Detectable Recognition of Hg2+

4,4′-Di(p-methylphenyl)-2,2′-bipyridine was synthesized via modified routine with a high yield of 15.3%,and was used as a ligand to form a new mixed-ligand amphiphilic ruthenium complex,cis-N,N-4,4′-di(p-methylphenyl)-2,2′-bipyridine-N,N-4,4′-dicarboxy-2,2′-bipyridine-N,N-dithiocyanato ruthenium(Ⅱ). This new mixed-ligands amphiphilic ruthenium complex was characterized by IR,UV-Vis,1H NMR and Maldi-TOF MS spectra and firstly used to detect Hg2+Its MLCT absorption(530 nm) was blue-shifted to 485 nm when Hg2+ was added to DMF-ethanol(volume ratio 1∶9) solution of the complex. The complex was combined quantitatively with Hg2+ not with other metal cations by the molar ratio of 1∶1,indicating that it can be used as a selective naked-eye sensor for Hg2+Its detective limit is 0.5×10-6 mol/L.