Add time:07/27/2019         Source:sciencedirect.com

A ruthenium complex [RuL1Cl2(PPh3)]Cl (L1 = (E)-2-((pyridine-2-yl)methyleneamino)benzoic(E) acid) was synthesized, characterized by analytical techniques, and then it has been employed as chemo-sensor for the recognition of acetate in H2O:CH3CN (80:20) medium. With fluorescence study, it has been shown that [RuL1Cl2(PPh3)]+ efficiently detects acetate ion without interference from other anions (F−, Cl−, Br−, I-, NO3−, HSO4−, H2PO4−) except HSO4−, for which the intensity of fluorescence is significantly enhanced. The stoichiometry determined by Job’s plot for the interaction of Ru-complex with acetate was found to be 1:2. With DFT study, the energy of HOMO orbitals of the complex was calculated in order to address why the fluorescence intensity was enhanced for the addition of HSO4− ion, it establishes that the energy of HOMO for [RuL1(AcO)HSO4]− is being lowered when compared to that for [RuL1Cl2(PPh3)]+, inhibiting the excited electron transfer, and thus it increases the fluorescence intensity due to Photo induced Electron Transfer (PET). The recognition of acetate/or HSO4− has been successfully applied into real bio-sample such as Saccharomyces cerevisiae cells by performing confocal fluorescence with using the ruthenium complex.

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