Photoresponsive metal–organic materials: exploiting the azobenzene switch

Mukhopadhyay, Rahul; Praveen, Vakayil K.; Ajayaghosh, Ayyappanpillai

doi:10.1039/c4mh00122b

Cited by 71 publications

(45 citation statements)

References 29 publications

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“…Light responsive MOFs, whose chemical and structural changes can be controlled merely by mild condition-light irradiation, have shown intriguing properties, and thus recently received great interest. [17][18][19][20][21][22][23][24][25][26][27][28] For example, light can induce configuration transformations of the linkers/guests, thus to tune the pores of MOFs and enhance their gas separation performances. [18][19][20][21] Photochemical reactions can also provide an alternative way to introduce functional groups/moieties and thus to develop smart MOFs with switchable optical absorption and fluorescence properties.…”

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confidence: 99%

Two-Photon Responsive Metal–Organic Framework

Cui

Wu³

et al. 2015

J. Am. Chem. Soc.

191

124

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Two-photon processing presents a facile means to tailor the properties of materials in three-dimensions. A two-photon responsive metal-organic framework (MOF) has been realized through the incorporation of a photoactive linker into a MOF via a multivariate strategy. The resulting MOF exhibits a significant one-photon and two-photon excited fluorescence change in response to UV light and infrared femtosecond laser, enabling spatial modulation of the fluorescence property of the MOF. It thus demonstrates the capacity of two-photon patterning and imaging inside the crystal, and the formation of three-dimensional two-photon excited fluorescent structure in a high resolution.

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confidence: 99%

Two-Photon Responsive Metal–Organic Framework

Cui

Wu³

et al. 2015

J. Am. Chem. Soc.

191

124

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“…Furthermore, photoswitchable molecular scaffolds20 and gel assemblies21 were realized utilising azobenzene photoisomerization. Also, for MOFs in the form of powders or thin films, photoswitchable moieties222324 were used to demonstrate the remote-control of the MOF properties like colour25, release262728 and adsorption2930313233 of the guest molecules, in particular of CO 2 (refs 32, 33). While in most cases illumination with ultraviolet-light was needed, linker molecules that can be switched with visible light were used for the MOF preparation recently34.…”

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confidence: 99%

Tunable molecular separation by nanoporous membranes

et al. 2016

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Metal-organic frameworks offer tremendous potential for efficient separation of molecular mixtures. Different pore sizes and suitable functionalizations of the framework allow for an adjustment of the static selectivity. Here we report membranes which offer dynamic control of the selectivity by remote signals, thus enabling a continuous adjustment of the permeate flux. This is realized by assembling linkers containing photoresponsive azobenzene-side-groups into monolithic, crystalline membranes of metal-organic frameworks. The azobenzene moieties can be switched from the trans to the cis configuration and vice versa by irradiation with ultraviolet or visible light, resulting in a substantial modification of the membrane permeability and separation factor. The precise control of the cis:trans azobenzene ratio, for example, by controlled irradiation times or by simultaneous irradiation with ultraviolet and visible light, enables the continuous tuning of the separation. For hydrogen:carbon-dioxide, the separation factor of this smart membrane can be steplessly adjusted between 3 and 8.

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“…Therefore, an innovative approach in tuning the properties of MOFs or PCPs is of paramount importance. Such considerations encourage chemists to explore the possibility of light sensitive metal–organic systems 4. In this context, azobenzene, a widely explored photoswitch,5 has been utilised recently by a number of research groups to design photoresponsive crystalline porous materials 6.…”

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confidence: 99%