Assembly And Properties Of Dichromatic/Trichromatic MOFs-based Composites

Metal-organic frameworks(MOFs),a new type of inorganic/organic hybrid material,hasbeen widely used in the field of luminescent sensing and detections.However,most of the MOF probes are based on single emission and have short-comings of single signal response and easy interference.Herein we prepared dichromatic/trichromatic composites by the incorporation of encapsulated luminescent modules(ELMs)into porous luminescent MOF hosts,and used the composites to detect volatile organic solvents(VOSs)and nitro aromatic compounds(NACs)through one/two-dimension(1D/2D)detection methods based on single/double ratiometric luminescent sensing.The methods can improve sensitivity and accuracy of the detection effectively.The details are as follows:(1)A series of dichromatic composites FRS/[Ru]2+@1 and trichromatic composites(FRS+[Ru]2+)@1 are obtained through the incorporation of different amounts of neutral organic dye FRS and complex [Ru(bpy)3](PF6)2([Ru](PF6)2)into a neutral MOF[Pb3(L1)3(H2O)2]?10DMF?6.5H2O(1)via ion exchange.1,B4(0.014 wt%FRS@1)and white-light-emitting composite G1((1.26 wt%FRS+0.46wt%[Ru]2+)@1)are used in luminescent sensing.For VOSs sensing: 1 can selectively detect Hexane;B4 can differentiate DMA,DMSO and DMF based on 1D ratiometric luminescent sensing,in which DMA and DMSO can be detected by naked eye;G1 can detect a series of solvents based on 2D ratiometric luminescent sensing,and among them,DMA,DMSO and DMF can be detected by naked eye.For NACs sensing: 1 can detect 2-NPHEN at three temperatures;B4 can clearly detect 2-NPHEN based on 1D ratiometric luminescent sensing at25 ℃,NB and 2-NPHEN at 40 ℃,NB,o-DNB,2-NPHEN and DNBP at 60 ℃;G1 can differentiate NB and o-DNB based on 2D ratiometric luminescent sensing.(2)A series of dichromatic composites [Ru]2+/[ACF]+@2 and trichromatic composites([Ru]2++[ACF]+)@2 are obtained by the incorporation of different amounts of [Ru](PF6)2 and organic dye [ACF]Cl into MOF(Me2NH2)3Cd0.5[Cd3(L2)2]?6DMF ?9H2O(2)through in situ synthesis.2,Q2(1.41 wt%[Ru]2+@2)and white-light-emitting composite V4((0.85wt%[Ru]2++0.087 wt%[ACF]+)@2)are used in luminescent sensing.For VOSs sensing: Q2 can detect DMSO and Butanone based on 1D ratiometric luminescent sensing;V4 candistinguish a series of solvents based on 2D ratiometric luminescent sensing.For NACs sensing: 2 can detect 2-NPHEN rapidly;Q2 can detect 2-NPHEN in 30 s based on 1D ratiometric luminescent sensing,and 1-NP in 10 min;V4 can detect 2-NPHEN,DNBP,o-DNB and 1-NP based on 2D ratiometric luminescent sensing,and distinguish three isomers including o-DNB,p-DNB and m-DNB.V4 can also detect DNBP by naked eye.