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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]

Abstract: A 2D network complex [Ag2(pydco)] n (1) (pydco=pyridine-2,6-dicarboxylic acid N-oxide) was synthesized and structurally characterized. Fluorescence spectrum of complex 1 and the free ligand indicates that the cooperative association of Ag–Ag contacts and the intraligand (π–π∗) interactions lead to the unusual intense fluorescent emission upon photoexcitation. [Copyright &y& Elsevier]