Multi‐Component Uptake of Dye Molecules by Films of Nanoporous Metal–Organic Frameworks

Saghanejhadtehrani, Mahnaz; Schneider, Erik; Heinke, Lars

doi:10.1002/cphc.201701023

Cited by 9 publications

(5 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This problem can be overcome by using SURMOFs, where only one hour is needed for the uptake by a 100 nm thick film. [32] The uptake of guest molecules by a SURMOF, from either the gas phase or the liquid phase, can be easily studied using a quartz crystal microbalance (QCM).…”

Section: Unique Model System For Diffusion Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

Surface‐Mounted Metal–Organic Frameworks: Crystalline and Porous Molecular Assemblies for Fundamental Insights and Advanced Applications

2019

Self Cite

View full text Add to dashboard Cite

with open voids attract significant interest, not only for use in gas storage and separation applications, [1b] but also as model systems used for fundamental investigations on molecular interactions. After being introduced about two decades ago, [2] this new type of crystalline coordination network created considerable excitement and much effort was devoted toward the discovery of new types of these compounds. In early 2017, after 20 years of intense research, the literature contains reports on more than 70 000 structurally characterized examples of this class. [3] Since MOFs can be assembled by combining molecular building blocks, specifically ditopic or higher-topic organic linkers and metal or metal-oxo nodes, a virtually unlimited number of structures can be realized. Moreover, essentially every organic molecule can be modified by the addition of appropriate coupling groups, e.g., carboxylic acid groups or pyridine units, to yield a ditopic linker. Therefore, the number of possible MOF structures is far greater than the number of known structures. In line with this consideration, more than a million of these compounds have been simulated using combinatorial approaches. [4] As MOFs are both crystalline and porous, they have fascinating and often surprising properties. Not only does the immense chemical space spanned by these compounds create enormous potential for advancing materials science, it also provides ideal matrices for reference experiments exploring fundamental spectroscopic and physicochemical properties. The framework provides a well-defined, crystalline, porous environment that can host guest molecules, thus permitting systematic spectroscopic investigations. In contrast to solvents or polymer matrices, MOFs provide a strictly periodic, very well defined structural framework, where the molecular environment is identical for each embedded guest molecule. In this respect, MOFs outperform amorphous noble-gas guest matrices [5] in which the environment surrounding varies from site to site, leading to inhomogeneous broadening of the embedded guest's spectroscopic features, including vibrational bands.Herein, we discuss the use of MOFs and, in particular, of surface-mounted metal-organic frameworks (SURMOFs), to provide well-defined environments for precisely determining Metal-organic frameworks (MOFs) are crystalline coordination polymers, assembled from inorganic nodes connected by organic linker molecules. An enormous surface area, huge compositional variety, regular structure, and favorable mechanical properties are among their outstanding properties. Monolithic MOF thin films, i.e., surface-mounted metalorganic frameworks (SURMOFs), with high degree of structural order and adjustable defect density, can be prepared on solid substrates using layer-by-layer techniques. Recent studies where SURMOFs served as model systems for quantitative studies of molecular interactions in porous media, including diffusion, are reviewed. Moreover, SURMOFs are ideally suited for the incorporation of photoactive mo...

show abstract

Section: Unique Model System For Diffusion Experimentsmentioning

confidence: 99%

“…[31] Taking advantage of the optical transparency of high-quality SURMOFs allows the investigation of multicomponent, i.e., binary and ternary mixture, uptake of dye molecules. [32]…”

Section: Unique Model System For Diffusion Experimentsmentioning

confidence: 99%

Surface‐Mounted Metal–Organic Frameworks: Crystalline and Porous Molecular Assemblies for Fundamental Insights and Advanced Applications

2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Here, an XNano device from Insplorion © was used to record the position (centroid) of the LSPR frequency. Previously, we used the XNano device to investigated multicomponent uptake of dye molecules by transparent [36,37] MOF films [38].…”

Section: Methodsmentioning

confidence: 99%

Thermal cis-to-trans Isomerization of Azobenzene Side Groups in Metal-Organic Frameworks investigated by Localized Surface Plasmon Resonance Spectroscopy

Zhou

Grosjean

Bräse

et al. 2018

Zeitschrift Für Physikalische Chemie

Self Cite

View full text Add to dashboard Cite

Abstract:The energy barrier for cis-to-trans isomerization is among the key parameters for photoswitchable molecules such as azobenzene. Recently, we introduced a well-defined model system based on thin films of crystalline, nanoporous metal-organic frameworks, MOFs. The system enables the precise investigation of the thermal cis-to-trans relaxation of virtually isolated azobenzene pendant groups by means of infrared spectroscopy in vacuum. Here, this approach is extended by using localized surface plasmon resonance spectroscopy. This simple and relatively inexpensive setup enables the investigation of the thermal cis-to-trans isomerization in different environments, here in argon gas or in liquid butanediol. The energy barrier for the cis-to-trans-relaxation in argon, 1.17 ± 0.20 eV, is identical to the barrier in vacuum, while the energy barrier in liquid butanediol is slightly larger, 1.26 ± 0.15 eV.

show abstract

“…In addition, the uptake by large individual MOF crystals can be recorded by optical methods [34,35]. The molecular uptake by thin MOF films can be monitored by various techniques, like surface-plasmon resonance methods [36], X-ray diffraction [37], or spectroscopy with infrared [38] or visible [39] light.…”

Section: Precise Uptake Measurements Using a Quartz Crystal Microbalamentioning

confidence: 99%

Thin Films of Homochiral Metal–Organic Frameworks for Chiroptical Spectroscopy and Enantiomer Separation

Chun

Heinke

2020

Symmetry

Self Cite

View full text Add to dashboard Cite

Chiral nanoporous solids are a fascinating class of materials, allowing efficient enantiomer separation. Here, we review the status, applications, and potential of thin films of homochiral metal–organic frameworks (MOFs). Combining the advantages of MOFs, whose well-defined, crystalline structures can be rationally tuned, with the benefits of thin films enables new opportunities for the characterization of the enantioselectivity, e.g., via chiroptical spectroscopy and straightforward molecular uptake quantifications. By incorporating photoresponsive molecules in the chiral MOF films, the enantioselectivity of the material can be dynamically remote-controlled. The most promising application of MOF films is their use as membranes, where the enantioselective separation of chiral molecules is demonstrated and parameters for further improvements are discussed.

show abstract

Multi‐Component Uptake of Dye Molecules by Films of Nanoporous Metal–Organic Frameworks

Cited by 9 publications

References 44 publications

Surface‐Mounted Metal–Organic Frameworks: Crystalline and Porous Molecular Assemblies for Fundamental Insights and Advanced Applications

Surface‐Mounted Metal–Organic Frameworks: Crystalline and Porous Molecular Assemblies for Fundamental Insights and Advanced Applications

Thermal cis-to-trans Isomerization of Azobenzene Side Groups in Metal-Organic Frameworks investigated by Localized Surface Plasmon Resonance Spectroscopy

Thin Films of Homochiral Metal–Organic Frameworks for Chiroptical Spectroscopy and Enantiomer Separation

Contact Info

Product

Resources

About