A Robust,Water-stable,and Multifunctional Praseodymium-organic Framework Showing Permanent Porosity,CO2 Adsorption Properties,and Selective Sensing of Fe^3+Ion

A robust microporous praseodymium-organic framework,{[Pr3(NTB)3(H2O)3]·(DMF)3(H2O)4}n(Pr-NTB,1),was solvothermally synthesized based on 4,4′,4″-nitrilotribenzoic acid(H3 NTB)and fully characterized.Single-crystal X-ray diffraction analysis reveals compound 1 possesses a three-dimensional porous coordination network,in which discrete cages are connected through microporous windows.1 shows extraordinary thermal and water stability;in particular,it is stable in aqueous media from pH=3 to 11,which is outstanding in benzyl-carboxylate based MOFs.Furthermore,1 exhibits permanent porosity with the BET surface area of 156.2 m^2·g^-1 and can adsorb suitable CO2(1.14 mmol·g^-1 at 273K/1 bar)with isosteric heat of adsorption(Q(st))of 28.5 kJ·mol^-1.These features suggest that the porous material 1 is a good candidate for CO2 capture in real-world application.Notably,the integration of fluorescent property,porosity and water stability in 1 promises it as a selective fluorescent sensor for Fe^3+cation in water.

A new luminescent metal-organic framework for selective sensing of nitroaromatic explosives

A microporous luminescent metal-organic framework [Zn4L2（H2O）2]＇（H2O）m（DMA）n （1） （H4L=5,5＇-（（1H-pyrazole-3,5-di- carbonyl）bis（azanediyl））diisophthalic acid, DMA=N,N-dimethylacetamide） was synthesized and characterized by infrared ra- diation （IR）, thermogravimetric analyses （TGA）, powder X-ray diffraction spectra （PXRD） and X-ray diffraction. Complex 1 has a three dimensional （3D） framework, which can be simplified as 5,5,5,5-c net with the Schlafi symbol of {43.64.83} {44.65.8 } {45.65 }2. This luminescent metal-organic framework （MOF） shows selectively sensitive to nitrobenzene and series of nitroaromatic explosives such as 4-nitrotoluene, 1,4-dinitrobenzene, 1,3-dinitrobenzene and 2,4-dinitrotoluene, and exhibits well recyclability. So complex 1 could be used to detect nitroaromatic explosives as a selective sensing material.

Sandwich-like QDs/MOFs films for selective sensing and multicolor emitting

A novel type sandwich-like composite films composed of ZIF-8 and CdTe QDs were successfully constructed through facile layer-by-layer assembly strategy and their potential applications were also explored.Based on the limitation effects of the aperture of ZIF-8,CdTe QDs/ZIF-8 fluorescent composite films exhibit obvious selective optical response toward hydrogen peroxide and folic acid.Furthermore,tunable colorful light emission composite films in the red-green region are obtained through incorporating two different sized QDs and ZIF-8 films into one composite films.

Selective sensing of Cr^(VI) and Fe^(Ⅲ) ions in aqueous solution by an exceptionally stable Tb^(Ⅲ)-organic framework with an AIE-active ligand

We herein report a new lanthanide metal-organic framework(MOF) that exhibits excellent chemical stability,especially in the aqueous solution over a wide pH range from 1 to 14.In contrast to many reported lanthanide MOFs,this Tb-based MOF emits cyan fluorescence inherited from the integrated AIEactive ligand,rather than Ln3+ ions.More remarkably,its fluorescence signal features a highly selective and sensitive "turn-off" response toward CrO_(4)^(2-),Cr_(2)O_(7)^(2- )and Fe^(3+) ions,highlighted with the low detection limits down to 68.18,69.85 and 138.8 ppm,respectively.Thus,the exceptional structural stability and sensing performance render this material able to be a superior luminescent sensor for heavy metal ions in wastewater.

Development of porphyrin-based fluorescent sensors and sensor arrays for saccharide recognition

Saccharide sensing is a very meaningful research topic as saccharides are involved in many biological activities.However,it is challenging to design molecular sensors for saccharides because this family of compounds is hydromimetic in aqueous solutions and shares a similar chemical structure.In this review,research progress in the development of porphyrin-based saccharide sensors is described with representative examples.We focus on using porphyrin as the signal reporter because porphyrins exhibit unique advantages in high chemical stability,long emission wavelength,and multiple structural modification strategies.Reported literature results have been classified into mainly two sections according to the general working principles of the porphyrin sensor molecules.In the first section,recognition unit,design strategy and sensing performance of traditional porphyrin-based selective saccharide sensors are discussed.While in the second section,development of porphyrin-based sensor arrays for pattern recognition of saccharides has been summarized.Looking through the design strategy and sensing performance of reported achievements,it is reasonable to anticipate a bright future for designing practical porphyrin-based saccharide sensors.

2009–2018年间尼泊尔地区OLR异常信号数据集的内容与研发

研究表明大地震之前由于地表温度的变化会引起长波辐射OLR(Outgoing Longwave Radiation)数据异常,但目前缺乏有效的技术来提取异常。我们提出了一种基于随机传感器和鞅理论的异常数据挖掘算法ADRM (Abnormality Detection based on Randomized Transducer and Power Martingales),经过实验对比能有效挖掘异常。本数据集记录了尼泊尔地区2009-2018年10年间的NOAA卫星的OLR数据和经过异常数据挖掘后的相应数据序列。数据集在地域上,以尼泊尔地震震中为中心的周边地域划分为同样经纬度2.5°×2.5°为单位的25个网格;时间上,定义每个年度是从上一年的9月28日到下一年的9月28日,共计366天,2009-2018年10年的数据。数据集存储为1个.xls文件,数据量为3.92 MB。基于该数据集的研究成果分别发表在《地球信息科学学报》(2018年20卷8期)和《IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing》(2018年11卷8期)。