Study On Unique MOFs Materials For Water Molecular Sensing

Material is the precursor and foundation of human material civilization,and also the direct driving force to promote social development.And it also guarantees the new energy development and environmental pollution governance.Material plays an important role in the development of human history and it is an indispensable part of human existence and life as well.Sensing material,as a branch of functional materials,has attracted more and more attentions.The metal-organic framework(MOFs)have become the "rising star" in the sensing material because of its skeleton rigidity,permanent porosity,structural diversity and both high chemical and thermal stability.Sensing material can meet the signal response to different analyte molecules,which includes signal transduction modes like interference measurement method,localized surface plasmon resonance spectroscopy(LSPR),quartz crystal microbalance(QCM)method,surface acoustic wave sensor(SAW),micro cantilever Liang Chuangan(MCL),electrochemical impedance spectroscopy,colloidal crystal(CC).Sensing material has made significant progress in the field of organic small molecules,steam and gas,anion/cations and other research areas.In this paper,two new complexes were designed and characterized.Their structural characterization,thermal stability,water solvent sensing,adsorption performance and the fluorescence lifetime,quantum yield and UV-visible spectroscopy of the complex with a solvated color effect have been studied.A hexagonal,chiral sample with one-dimensional helical structure in the b direction was prepared by self-assembly of 1,3,5-trimesteric acid ligand and amide ligand L1 and metal Zn(?)by the solvothermal method.The results show that the complexes crystallized in the P6422 and P6222 space groups,the solvent accessiable space is 32.8%,and the four self-interpenetrating structures are observed.Under grinding is enhanced to relative to the original sample?s fluorescence intensity,fluorescence life and quantum yield.And the water content in different organic solvents was analyzed and the results show,that the samples could allow three different fluorescence response mechanisms to different concentrations.In addition,the adsorption performance of MOF-1 shows that the grinding of the sample can control the C2H2,C2H4,CO2 adsorption capacity.MOF-2,with 1D helical structure,was prepared by the self-assembly of Co(?),4,4'-bipyridine and L2 ligands through hydrothermal method.There are two H2 O molecules to participate in coordination and it crystalliz in the P61 and P65 space group.Under vacuum at 200 ?,the sample were changed with the color from pink to blue-violet due to the loss of coordination water molecules,leding to the coordination number of metal Co2+ changes from 6 to 4,while the sample are recovered from pink to blue-violet by loading water molecular.In the water molecular sensing study,it was found that MOF-2 could allow typical solvated color effect on water molecules,and the limit could be as low as 10%.And then,this phenomenon was explained by UV-Vis spectrophotometer.