Phosphorescence doping in a flexible ultramicroporous framework for high and tunable oxygen sensing efficiency

Qi, Xiao‐Lin; Liu, Si‐Yang; Lin, Rui‐Biao; Liao, Pei‐Qin; Ye, Jiawen; Lai, Zhihui; Guan, Yang; Cheng, Xiao‐Ning; Zhang, Wei‐Xiong; Chen, Xiao‐Ming

doi:10.1039/c3cc43461c

Cited by 65 publications

(41 citation statements)

References 46 publications

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“…25−27 For example, a simple, color-changing, ratiometric oxygen sensor was constructed by doping small amounts of Ru II in an ultramicroporous, fluorescent Zn II coordination polymer. 28 A nanocomposite material consisting of azobenzene-functionalized graphene oxide and stilbene-MOF displayed selectivity to dinitrotoluene over trinitrotoluene with subppm sensitivity. 29 Alternatively, entrapping of functional molecules in MOF materials is a promising method for the design of functional MOFs and signal-transduction strategy.…”

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confidence: 99%

Porphyrin-Encapsulated Metal–Organic Frameworks as Mimetic Catalysts for Electrochemical DNA Sensing via Allosteric Switch of Hairpin DNA

et al. 2015

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A sensitive electrochemical sensor is designed for DNA detection based on mimetic catalysis of metal-organic framework (MOF) and allosteric switch of hairpin DNA. The functional MOFs are synthesized as signal probes by a one-pot encapsulation of iron(III) meso-5,10,15,20-tetrakis(4-carboxyphenyl) porphyrin chloride (FeTCPP) into a prototypal MOF, HKUST-1(Cu), and sequentially conjugated with streptavidin (SA) as a recognition element. The resulting FeTCPP@MOF composites can mimetically catalyze the oxidation of o-phenylenediamine (o-PD) to 2,2'-diaminoazobenzene, which is a good electrochemical indicator for signal readout. The presence of target DNA introduces the allosteric switch of hairpin DNA to form SA aptamer, and thus, FeTCPP@MOF-SA probe is brought on the electrode surface via the specific recognition between SA and the corresponding aptamer, resulting in the enhancement of electrochemical signal. The "signal-on" electrochemical sensor can detect target DNA down to 0.48 fM with the linear range of 10 fM to 10 nM. Moreover, the MOF-based electrochemical sensor exhibits acceptable selectivity against even a single mismatched DNA and good feasibility in complex serum matrixes. This strategy opens up a new direction of porphyrin-functionalized MOF for signal transduction in electrochemical biosensing.

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confidence: 99%

Porphyrin-Encapsulated Metal–Organic Frameworks as Mimetic Catalysts for Electrochemical DNA Sensing via Allosteric Switch of Hairpin DNA

et al. 2015

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“…Chen and coworkers adopted the same principle to design Ru-doped azolate MOF for oxygen sensing. 43, 44 …”

Section: Mofs As Sensors and Sensory Materialsmentioning

confidence: 99%

Metal–Organic Frameworks as Sensory Materials and Imaging Agents

et al. 2013

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Metal-organic frameworks (MOFs) are a class of hybrid materials self-assembled from organic bridging ligands and metal ion/cluster connecting points. The combination of a variety of organic linkers, metal ions/clusters, and structural motifs can lead to an infinite array of new materials with interesting properties for many applications. In this Forum article, we discuss the design and applications of MOFs in chemical sensing and biological imaging. The first half of this article focuses on the development of MOFs as chemical sensors by highlighting how unique attributes of MOFs can be utilized to enhance sensitivity and selectivity. We also discuss some of the issues that need to be addressed in order to develop practically useful MOF sensors. The second half of this article focuses on the design and applications of nanoscale metal-organic frameworks (NMOFs) as imaging contrast agents. NMOFs possess several interesting attributes, such as high cargo loading capacity, ease of post-modification, tunable size and shape, and intrinsic biodegradability, to make them excellent candidates as imaging contrast agents. We discuss the use of representative NMOFs in magnetic resonance imaging (MRI), X-ray computed tomography (CT), and optical imaging (OI). Although still in their infancy, we believe that the compositional tunability and mild synthetic conditions of NMOF imaging agents should greatly facilitate their further development for clinical translation.

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“…[2] When isoreticular MOFs possess the same crystal symmetry and very similar lattice parameters, the corresponding geometrically equivalent building blocks can be mixed to construct solid-solution frameworks (SSFs) with structures lying between the parent MOFs. [6] With suitable mixing ratio of building blocks,S SFs can delicately balance the advantages/shortages of the parent MOFs for better applications. [6] With suitable mixing ratio of building blocks,S SFs can delicately balance the advantages/shortages of the parent MOFs for better applications.…”

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confidence: 99%

Flexible, Luminescent Metal–Organic Frameworks Showing Synergistic Solid‐Solution Effects on Porosity and Sensitivity

Liu

Zhou

et al. 2016

Angew Chem Int Ed

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Mixing molecular building blocks in the solid solution manner is a valuable strategy to obtain structures and properties in between the isostructural parent metal-organic frameworks (MOFs). We report nonlinear/synergistic solid-solution effects using highly related yet non-isostructural, phosphorescent Cu triazolate frameworks as parent phases. Near the phase boundaries associated with conformational diversity and ligand heterogeneity, the porosity (+150 %) and optical O sensitivity (410 times, limit of detection 0.07 ppm) can be drastically improved from the best-performing parent MOFs and even exceeds the records hold by precious-metal complexes (3 ppm) and C (0.2 ppm).

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Phosphorescence doping in a flexible ultramicroporous framework for high and tunable oxygen sensing efficiency

Abstract: Doping very small amounts of Ru(II) into a flexible, ultramicroporous, fluorescent Zn(II) coordination polymer produced phosphorescent materials with very high and tunable oxygen quenching efficiency; and a simple color-changing ratiometric oxygen sensor has been constructed.

Cited by 65 publications

References 46 publications

Porphyrin-Encapsulated Metal–Organic Frameworks as Mimetic Catalysts for Electrochemical DNA Sensing via Allosteric Switch of Hairpin DNA

Porphyrin-Encapsulated Metal–Organic Frameworks as Mimetic Catalysts for Electrochemical DNA Sensing via Allosteric Switch of Hairpin DNA

Metal–Organic Frameworks as Sensory Materials and Imaging Agents

Flexible, Luminescent Metal–Organic Frameworks Showing Synergistic Solid‐Solution Effects on Porosity and Sensitivity

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