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The hydrothermal reaction of Ln(NO3)3·6H2O with H2tyia (H2tyia = 5-(triazol-1-yl) isophthalic acid) afforded the lanthanide organic frameworks (Ln-MOFs), [Eu2(tyia)3(H2O)3]n (1) and {[Ln2(tyia)3·(H2O)3]· 3H2O}n (Ln = Tb 2, Dy 3, Sm 4, Gd 5, and Nd 6). Compounds were characterized by routine methods: PXRD, elemental analysis, solid-state luminescence properties analysis, TGA, FT-IR, and single-crystal X-ray crystallography. In this work, the luminescent properties of 2, 4, 5, and 6 and the responsiveness of various chemical components contained in urine were investigated. These MOFs detect 1-naphthol (1-N), urinary thiodiglycolic acid (TDGA), uric acid (UA), and hippuric acid (HA), which are the final metabolites of carbaryl, vinyl chloride monomers, purine, and toluene, respectively. These new Ln-MOFs offer the potential for biomarkers or metabolic sensors and show excellent selective and sensitive luminescence detection of 1-N, TDGA, UA, and HA. [ABSTRACT FROM AUTHOR]

In many sensing and catalytic applications, the target molecule is required to be carried in an effective manner in a specific condition. Metal-organic frameworks (MOFs) have high porosity, large surface area, and tunable functionality and are promising carriers for such purposes. Current approaches to detect Tb3+ and reduce 4-nitrophenol (4-NP) are based on multistep methods. We synthesized a series of coordination polymers (1-4) with excellent fluorescence and catalytic activity. Moreover, 1 and 2 exhibit significantly higher fluorescence than other compounds, indicating that 1 and 2 could be efficient multifunctional fluorescence probes for high-sensitivity sensing of nitrobenzene, and 1 can be used as a highly sensitive fluorescent sensor to detect Tb3+, with a detection limitation of 5 × 10−7 M. In addition, the as-prepared Ag@compound 1 shows remarkable catalytic performance to reduce 4-NP, with a reduction rate constant k as large as 2.07 × 10−2 s−1. [ABSTRACT FROM AUTHOR]

A terbium organic framework (Tb-MOF), {[Tb2(Pyznpy)6·4H2O]·2H2O}n (1) (Hpyznpy = 4-((3-(pyrazin-2-yl)-1H-pyrazol-1-yl) methyl) benzoic acid), has been synthesized under solvothermal conditions. X-ray crystal analysis indicates that 1 crystallizes in the triclinic form with P-1 space group, and six petal-like 1D chains are connected by hydrogen bonds and π···π interactions to form the 3D structure of 1. Tb-MOF 1 exhibits an intense green fluorescence under UV light. The fluorescent nature of 1 suggests that Tb-MOF 1 could be an efficient multifunctional fluorescence probe for sensitivity sensing of small organic molecules and metal ions, especially for nitrobenzene and Fe3+. The mechanism of the sensing properties was studied as well. [ABSTRACT FROM AUTHOR]

A crystal of [Na2(ABT) · 5H2O] (ABT = 3,3′-azobis(1,2,4-triazole)) (1) was characterized by single-crystal X-ray diffraction. Complex1features a 1-D chain and each ABT2−is a µ1,2,6bridge with three triazole nitrogen atoms coordinating to three different sodium(I). Aqueous solution of1(6.0 × 10−5 mol L−1) shows photochromism. Fluorescence of solid1displays green photoluminescence under UV-light or laser irradiation and can be employed to label onion cell. [ABSTRACT FROM PUBLISHER]