| Luminescent metal-organic frameworks?LMOFs?,a new type of luminescent material,have been served as excellent candidates for chemical sensors.However,most of the MOF probes is limited to single-emission intensity,because the single-emission intensity varies depending on many uncontrollable factors.In this paper,bio-MOF-1 was selected as matrix,and two luminescence modules?ELMs?were loaded to form ternary MOF-based composites,which were used as luminescent probes for luminescence detection.Based on three-emission characteristics,multi-dimensional recognition code maps can be built based on the time/concentration-dependent evolution of the ratios of emission intensities,which improves detection sensitivity and accuracy.The details are as follows:1.The separate or simultaneous encapsulation of green-and red-emitting luminescent complexes cations(green-emitting[Pt?ppy??NCMe?2]ClO4?[Pt]ClO4?and red-emitting[Ru?bpy?2?MebpyCHO?]?PF6?2?[Ru1]?PF6?2?or luminescent dyes?green-emitting FRS and red-emitting luminescent dyes cations[SFT]Cl?into the pores of bio-MOF-1 lead to WLE trichromatic composite:Z3(0.91 wt%[Pt]++1.10 wt%[Ru1]2+)@bio-MOF-1 and X3?0.5wt%FRS+0.06 wt%[SFT]+?@bio-MOF-1,and used for luminescence sensing.2.Z3 can distinguish aromatics,alcohols,halogenated hydrocarbons based on 2D ratiometric code map.It is also the first selective colorimetric probe to detect 1,2-DCE and1,1,1-TCE.Since the code points of nitro aromatic compounds?NACs?and amino compounds?ACs?locate in completely different regions in the 2D mode map,Z3 can accurately distinguish vapors of NACs and ACs.Using the 3D mode map method,Z3 can distinguish Nitrobenzene?NB?,o-nitrophenol?o-NPHEN?,o-nitrotoluene?o-NT?,m-nitrotoluene?m-NT?,m-nitrophenol?m-NPHEN?and 1-nitronaphthalene?1-NP?,as well as ammonium?NH3?,n-propylamine?n-PrNH2?,n-butylamine?n-BuNH2?,ethylenediamine?EA?and 1,3-diaminopropane?1,3-PA?.Besides,Z3 can distinguish first,second and third amines.3.Acid-base titration experiment on X3 water suspension can be helpful in qualitatively detection of the acidity or alkalinity of water system according to the color of its luminescence changing from white to blue or green.It can quantitatively detect pH in the range of pH=10.312,and has good reusability.Using X3 as a luminescent probe,Lysine?Lys?,Histidine?His?,Cysteine?Cys?and Glutathione?GSH?can be distinguished by the 3D code map in a buffer of pH=8.38,and they can be quantitatively analyzed.The corresponding lowest detection limit of them are as follows:LOD?Lys?=3.7×10-4 M,LOD?His?=4.5×10-5 M,LOD?Cys?=7×10-5 M,LOD?GSH?=2.3×10-5 M.X3 can also be used to detect Fe3+with LOD of 2.18×10-4M.4.The assemble reactions of 5-?1,3-dioxo-1H-benzo[de]isoquinolin-2?3H?-yl?isophthalic acid?H2L?and Zn2+/Cd2+ions led to two compounds:[ZnL?DMSO?2]?3DMSO?1?and[Cd2L2?DMSO?4]?DMF?2?.1 and 2 feature 1D coordination chain.?-?interaction further connect the 1D chains into 2D supramolecular networks.Upon grinding,1 and 2 show increase of quantum efficiencies?34.8 and 45.4 times of increase compared with original samples for the two compounds respectively?and red shift of the emission peaks?45 and 41nm of shift compared with original samples for the two compounds respectively?.Both indicate the compounds are good luminescence mechanically responsive materials. |
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