Nanoporous frameworks exhibiting multiple stimuli responsiveness

Kundu, Pintu K.; Olsen, Gregory L.; Kiss, Vladimir; Klajn, Rafał

doi:10.1038/ncomms4588

Cited by 159 publications

(158 citation statements)

References 56 publications

(63 reference statements)

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“…Based on the interest of research studies on phenoxyquinone derivatives, 55 the authors also designed a phenoxyquinone-embedded PDMS membrane to recognize the vapour of primary aliphatic amines (R-NH 2 ). 86 As shown in Fig. This membrane could realize the colorimetric detection of R-NH 2 , since secondary and tertiary amines showed no obvious effects on the composite.…”

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confidence: 91%

Photochromic sensors: a versatile approach for recognition and discrimination

et al. 2015

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Photochromic sensors are widely used in detecting and monitoring analytes. Due to the photoswitchable properties, photochromic sensors show advantages in providing more recognition states and sensing information, and thus better sensitivity to external stimulations. Via reasonable design of photochromic sensors with various ionophores, dyes, platforms and metallic complexations, it is promising to achieve visual, sensitive and high-throughput detection. In this review, we summarized the applications of photochromic sensors in the areas of specific recognition and multi-analyte discrimination, based on their isomerization to light, as well as pH, temperature, solvent, etc. Specially, the multi-analyte determination was introduced, which has aroused extensive interest in recent years.

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Section: View Article Onlinementioning

confidence: 91%

Photochromic sensors: a versatile approach for recognition and discrimination

et al. 2015

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“…Note the hump at approximately 590 nm in the spectruma t 30 min, which can be attributed to the 1 MC isomer.Aggregation-induced SP!MC isomerization has been observed previously;s ee, for example, Refs [48][49][50]…”

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confidence: 76%

Noncovalent Interactions with Proteins Modify the Physicochemical Properties of a Molecular Switch

et al. 2015

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It is reported that spiropyran-aw idely investigated molecular photoswitch-can be stabilized in aqueous environments in the presence of av ariety of proteins, including human serum albumin, insulinf ibrils, lysozyme, and glucoseo xidase. The optical properties of the complexed photoswitch are protein dependent, with humans erum albumin providing the spiropyran with emission features previously observed for ap hotoswitch confined in media of high viscosity.D espite being bound to the protein molecules,s piropyranc an undergo ar ing-opening reactionu pon exposure to UV light. This photoisomerization process can affect the properties of the proteins:h ere, it is shown that the electrical conduction through humans erum albumin to which the spiropyran is bound increases following the ring-opening reaction.Bacteriorhodopsinh as long impressed scientists with the elegance with whichi tu ses the energy of sunlight to guide the motion of protons across cell membranes. This functioni se nabled by ap hotoswitchabler etinal moiety strategically positioned within the protein structure;light-induced isomerization of retinal triggersacascade of reactions, resulting in proton transfer against apHgradient. [1,2] Inspired by this and other examples, [3] chemists have developed different strategies to covalently immobilize photoswitchablem olecules within various biomacromolecules, [4][5][6][7][8][9] with the primary goal of controlling their structures and/or functions. Attractive and diverse applications have become possible, including photoswitchable enzymaticc atalysis [10,11] and light-actuated ion transport through ac hannel protein. [12] Herein, we considered as impler approach, which takes advantage of noncovalent interactions [13,14] between am olecular switch (in our case, spiropyran [15][16][17][18][19] )a nd the target protein. We found that av ariety of proteins, including human serum albumin (HSA), insulin, glucoseo xidase, and lysozyme can provide the spiropyran with good water solubility,i ndicating the formation of protein-spiropyranc omplexes. Within these complexes,s piropyran remained photoresponsive;h owever,i ts optical properties depended on which protein "host" it was bound to. We also found that photoisomerization of spiropyran bound to the serum albuminr esults in markedlyi ncreased electricalconduction through the protein.We worked with the most widely investigated spiropyran-1',3'-dihydro-1',3',3'-trimethyl-6-nitrospiro[2H-1-benzopyran-2,2'-(2H)-indole] (1,F igure 1a;S ection S1 in the Supporting Information). This compound is practically insoluble in water,a s evidenced by an experiment in which we injected 8.6 mLo f a3 .5 mm solutiono f1 in DMSO into 1mLo faphosphate-buffered saline (PBS;5m m phosphate, 70 mm NaCl, pH 8). The characteristic optical response of 1 disappeared within 4h,i ndicatingq uantitative precipitation (Figure 1b). However,w hen the same amount of 1 wasi njected into the buffer solution containing HSA at 30 mm (an equimolar ratio of 1 to the protein), the spiropyran remained soluble...

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“…Flexible crystalline solids are endowed with the ability to change their structures in response to external stimuli, and have recently become appealing to materials scientists 1. This so‐called dynamism might be key to developing a charming class of smart materials because their structurally dependent physical, chemical, and mechanic properties could be cooperatively moderated 2.…”

Section: Introductionmentioning

confidence: 99%

A Temperature‐Responsive Smart Europium Metal‐Organic Framework Switch for Reversible Capture and Release of Intrinsic Eu³⁺ Ions

Zhu

Song

et al. 2015

Advanced Science

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Stimuli‐responsive structural transformations are emerging as a scaffold to develop a charming class of smart materials. A EuL metal‐organic framework (MOF) undergoes a reversible temperature‐stimulated single‐crystal to single‐crystal transformation, showing a specific behavior of fast capture/release of free Eu3+ in the channels at low and room temperatures. At room temperature, compound 1a is obtained with one free carboxylate group severing as further hook, featuring one‐dimensional square channels filled with intrinsic free europium ions. Trigged by lowering the ambient temperature, 1b is gained. In 1b, the intrinsic free europium ions can be fast captured by the carboxylate‐hooks anchored in the framework, resulting in the structural change and its channel distortion. To the best of our knowledge, this is the first report of such a rapid and reversible switch stemming from dynamic control between noncovalent and covalent Eu–ligand interactions. Utilizing EuL MOF to detect highly explosive 2,4,6‐trinitrophenol at room temperature and low temperature provides a glimpse into the potential of this material in fluorescence sensors.

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Nanoporous frameworks exhibiting multiple stimuli responsiveness

Cited by 159 publications

References 56 publications

Photochromic sensors: a versatile approach for recognition and discrimination

Photochromic sensors: a versatile approach for recognition and discrimination

Noncovalent Interactions with Proteins Modify the Physicochemical Properties of a Molecular Switch

A Temperature‐Responsive Smart Europium Metal‐Organic Framework Switch for Reversible Capture and Release of Intrinsic Eu³⁺ Ions

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Nanoporous frameworks exhibiting multiple stimuli responsiveness

Cited by 159 publications

References 56 publications

Photochromic sensors: a versatile approach for recognition and discrimination

Photochromic sensors: a versatile approach for recognition and discrimination

Noncovalent Interactions with Proteins Modify the Physicochemical Properties of a Molecular Switch

A Temperature‐Responsive Smart Europium Metal‐Organic Framework Switch for Reversible Capture and Release of Intrinsic Eu3+ Ions

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Product

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A Temperature‐Responsive Smart Europium Metal‐Organic Framework Switch for Reversible Capture and Release of Intrinsic Eu³⁺ Ions