2022
DOI: 10.1021/acs.langmuir.2c01810
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Nanoporous Metal–Organic Framework Thin Films with Embedded Fulgide for Light-Modulated Guest Adsorption and Diffusion

Abstract: Smart and photoresponsive materials and thin films allow the dynamic remote control of their central properties. By incorporation of photochromic molecules in nanoporous metal–organic frameworks (MOFs), the interaction between the MOF host and the guest molecules in the pores can be modified. Here, a MOF film of type UiO-68 is presented in which the photoswitchable feature is added by embedment of photochromic fulgide molecules of type Aberchrome 670 in the pores. The photoisomerization in the pores is explore… Show more

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Cited by 2 publications
(4 citation statements)
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References 38 publications
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“…An in-depth examination of the rates of the mass transfer (Figure b) was conducted by describing the experimental data with the solution of Fick’s second law for a thin homogeneous film (here with a thickness of 0.2 μm) and an instant change of the surface concentration. ,, The obtained diffusion coefficient for ethanol in the MOF with HABI in the dimer state is (6.6 ± 0.9) × 10 –14 m 2 s –1 , whereas the diffusion coefficient for ethanol in the MOF with HABI in the radical state is (1.7 ± 0.2) × 10 –14 m 2 s –1 . This means that the diffusion coefficient drops significantly by 75%.…”
Section: Resultsmentioning
confidence: 99%
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“…An in-depth examination of the rates of the mass transfer (Figure b) was conducted by describing the experimental data with the solution of Fick’s second law for a thin homogeneous film (here with a thickness of 0.2 μm) and an instant change of the surface concentration. ,, The obtained diffusion coefficient for ethanol in the MOF with HABI in the dimer state is (6.6 ± 0.9) × 10 –14 m 2 s –1 , whereas the diffusion coefficient for ethanol in the MOF with HABI in the radical state is (1.7 ± 0.2) × 10 –14 m 2 s –1 . This means that the diffusion coefficient drops significantly by 75%.…”
Section: Resultsmentioning
confidence: 99%
“…In particular, the incorporation of photochromic molecules into MOFs provides a promising strategy to realize MOFs with remote-controllable properties, 20−22 enabling researchers to develop various applications such as drug delivery, 23 sensing, 24 and catalysis 25 as well as gas adsorption and diffusion. 26 In contrast to conventional hydrothermal or solvothermal techniques used to prepare MOFs in the form of powders, 27 surface-mounted metal−organic frameworks (SURMOFs) are synthesized in a layer-by-layer (LBL) manner directly on the substrate surface, resulting in the formation of thin and homogeneous MOF films. 28 The transparency of SURMOFs 29 allows for the characterization of their optical properties using UV−vis spectroscopy in transmission mode.…”
Section: ■ Introductionmentioning
confidence: 99%
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“…Starting with the work of Yaghi and co-workers in 1999 on MOF-5, this research field has been growing ever since, also focusing on guest encapsulation and the exploitation of positive synergistic effects of the interaction between two species. Here, especially photochromic dyes being non-covalently attached to the MOF framework were found to show properties that are similar to those observed in the dissolved state. To probe the optical properties of TI not only inside inorganic but also inside inorganic–organic matrices, TI was inserted into the three MOFs MIL-68­(In), MIL-68­(Ga), and MOF-5 . These MOFs are well known from other studies on dye encapsulation ,,,,, and proved to serve as exemplary representatives concerning their sufficient pore entrance window, pore diameter, color, and inner polarity.…”
Section: Introductionmentioning
confidence: 93%