A Simple Schiff Base Probe for Quintuplicate-Metal Analytes with Four Emission-Wavelength Responses

Abstract

A versatile mono-Schiff compound consisting of o-aminobenzene-hydroxyjulolidine (ABJ-MS) has been easily synthesized using a one-step reaction. ABJ-MS displays four diverse fluorescence responses to the addition of Zn2+/Al3+/Fe3+/Ag+, with the maximum fluorescence emission at 530 nm undergoing a hypsochromic shift to 502/490/440/430 nm, synchronously with the discriminating fluorescence enhancement being 10.6/22.8/2.6/7.1-fold, respectively. However, the addition of Cu2+ into ABJ-MS leads to an opposite behavior, namely, fluorescence quenching. Meanwhile, ABJ-MS also displays distinct absorption changes after adding these five metal ions due to different binding affinities between them and ABJ-MS, which gives ABJ-MS quite a versatile detecting nature for Cu2+/Zn2+/Al3+/Fe3+/Ag+. Moreover, ABJ-MS can mimic a series of versatile AND/OR/INH-consisting logic circuits on the basis of the Cu2+/Zn2+/Al3+/Fe3+/Ag+-mediated diverse optical responses. These will endow the smart ABJ-MS molecule and potential applications in the multi-analysis chemosensory and molecular logic material fields.

A Novel Fluorescent Probe containing dihydropyrimidinone Analogue for Highly Sensitive, Selective Detection of Al(III) Ions with its Molecular Docking, ADME/T and Anticancer Impact

“…Figure 8 illustrates the fluorescence spectra of the studied chemosensor when exposed to varying concentrations of Al(III) ions ranging from 0 to 6×10 −5 M. The chemosensor exhibits emission bands at 592 nm in an EtOH solvent. Upon incremental introduction of diverse concentrations of Al(III) ions to the chemosensor, the fluorescence intensity diminishes, accompanied by a noticeable blue shift of 44 nm in the emission peak [43] . At higher concentrations of metal ions, distinct bands emerge, attributed to the formation of a 1 : 2 ligand‐metal complex, a finding subsequently corroborated by Job′s plot analysis (Figure S1) (at which the mole fraction C L /C L +C M showed maxium at 0.601), and inductively coupled plasma (ICP) analysis.…”

“…Upon incremental introduction of diverse concentrations of Al(III) ions to the chemosensor, the fluorescence intensity diminishes, accompanied by a noticeable blue shift of 44 nm in the emission peak. [43] At higher concentrations of metal ions, distinct bands emerge, attributed to the formation of a 1 : 2 Scheme 2. Color changes upon addition of various metal ions (1×10 À 3 M) to DPDAD chemosensor ligand-metal complex, a finding subsequently corroborated by Job's plot analysis (Figure S1) (at which the mole fraction C L /C L + C M showed maxium at 0.601), and inductively coupled plasma (ICP) analysis.…”