A 2D water-stable metal–organic framework for fluorescent detection of nitroaromatics

A Flexible Two‐Fold Interpenetrated Indium MOF Exhibiting Dynamic Response to Gas Adsorption and High‐Sensitivity Detection of Nitroaromatic Explosives

“…The phase purity of the product has been confirmed by the powder X-ray diffraction (PXRD) analysis ( Figure S1). Meanwhile, single crystal X-ray diffraction analysis shows that InOF-23 crystallizes in the orthorhombic space group Pnna with cell parameters a = 15.7716 (12) , b = 12.4160(6) , c = 22.8681(11) , V = 4478.0(5) 3 (more crystallographic information is summarized in Table S1-S3), and its asymmetricu nit is comprised of one In III ion, two fully deprotonated HL À ligand and one chloride ion (Figure 1a). Each In III centrea dopts typical 8-coordinated geometry of linking eight carboxyl oxygen atoms from four fully deprotonated L 2À ligandsw ith the InÀOb ond lengths in the range of 2.153(5) to 2.512(8) to give at etrahedral four-connected node.…”

“…The fluorescent intensity gradually decreased with the incremental addition of NB,a nd almostq uenched when the amounto fN Br eached3 00 mL( 1000 ppm) with the quenching efficiency being 85.81 % ( Figure 5a). The quenching effect of NB was calculated by the use of the Stern-Volmer (SV) equation, I 0 /IÀ1 = K sv [M], [12] where I 0 is the fluorescencei ntensity before the addition of NB and Ii st he fluorescencei ntensity after the addition of NB, [M] is the molarc oncentration of NB (mm), and K sv is the quenching constant( M À1 ). The maximum emission intensities at ca.…”

Controllable preparation and functionally graded programming of carbon aerogel

“…The gels have solved many problems such as environmental protection, construction and food (Wang et al , 2017; Yan et al , 2016; Zhou et al , 2014; Yan et al , 2017; Zhou et al , 2013). Some of them can adapt environmental changes with good flexibility and 3D network framework (Kang et al , 2007; Ning et al , 2018; Xie et al , 2018; Zhang et al , 2017). Because of their unique performance, the research, production and application of the gels has rapidly developed in recent decades.…”

A Bifunctional Luminescent Metal–Organic Framework for the Sensing of Paraquat and Fe3+ Ions in Water

“…As one of the most well-known porousm aterials, metal-organic frameworks (MOFs) have drawn widespread attention, not only because of their diversea nd interesting architectures, but also because they have shown great potentiali nt he fields of gas separation, heterogeneous catalysis, molecular magnetism, and chemical sensing. [5][6][7][8][9][10][11][12][13][14] In particular,o ver the past decade, luminescent MOFs have been regardeda sp romising candidate materials, owing to their competitive advantages compared with other fluorescentm aterials: [2][3][4][10][11][12][13][14] 1) the good crystallinity of MOFs allows them to adopt defined structures that can be characterized by using single-crystal X-ray diffraction, which is beneficial for establishing structure-property correlations and, thus, for exploring their luminescence-response mechanisms;2 )their structures can be readily adjusted and modified by regulating their two major components,t hat is, their metal centers and organic linkers, as well as by tuning other reaction parameters, including the solvent, temperature, pH value, and the relative proportions of the reagents,t hereby affording the opportunity to realize structure-inducedl uminescence performance;3 )most importantly,t he adjustable porosity of MOFs allow them to adsorb and pre-enrich target analytes, which can increase the probability of interactions between host MOFs and guest analytes,t hereby enhancing their detection limit and sensitivity.T hus,alarge number of MOFbased luminescent sensors have been prepared and used in the detection of differenta nalytes, including biomolecules, explosives, organic molecules, anions,c ations, temperature, and pH value. [2][3][4][10][11][12][13][14] Nevertheless, most of the previously reported MOF-based sensors have been used in nonaqueous system, which may be mainly owing to the poor water stabilityo f MOFs.…”