Eine enantioselektive elektronische Nase: Ein Array nanoporöser homochiraler MOF‐Filme zur stereospezifischen Erkennung chiraler Geruchsmoleküle

Okur, Salih; Qin, Peng; Chandresh, Abhinav; Li, Chun; Zhang, Zejun; Lemmer, Ulrich; Heinke, Lars

doi:10.1002/ange.202013227

Cited by 8 publications

(4 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The design of stimulus-responsive chemical species with chiroptical variation at the molecular level is critical for chiral switching. In most other photoresponsive chiral MOFs, the chiral symmetry and pore structures are used for the study of chiral separation and asymmetric catalysis; however, the switchable chiroptical properties still lacks of study [ 38 , 39 ]. Though similar chiroptical behaviors were previously found in some small molecular systems, such as diarylethene (DTE), azo-compounds, and 2+2 cycloaddition systems [ 40 – 46 ], these systems do not involve a PET process due to the difficulty in ensuring the contribution of chiral chromophores, especially in the solid state.…”

Section: Discussionmentioning

confidence: 99%

Concomitant Photoresponsive Chiroptics and Magnetism in Metal-Organic Frameworks at Room Temperature

Xia

Gao

et al. 2021

Research

View full text Add to dashboard Cite

Stimulus-responsive metal-organic frameworks (MOFs) can be used for designing smart materials. Herein, we report a family of rationally designed MOFs which exhibit photoresponsive chiroptical and magnetic properties at room temperature. In this design, two specific nonphotochromic ligands are selected to construct enantiomeric MOFs, {Cu2(L-mal)2(bpy)2(H2O)·3H2O}n (1) and {Cu2(D-mal)2(bpy)2(H2O)·3H2O}n (2) (mal=malate, bpy=4,4’−bipyridine), which can alter their color, magnetism, and chiroptics concurrently in response to light. Upon UV or visible light irradiation, long-lived bpy− radicals are generated via photoinduced electron transfer (PET) from oxygen atoms of carboxylates and hydroxyl of malates to bpy ligands, giving rise to a 23.7% increase of magnetic susceptibility at room temperature. The participation of the chromophores (-OH and -COO−) bound with the chiral carbon during the electron transfer process results in a small dipolar transition; thus, the Cotton effects of the enantiomers are weakened along with a photoinduced color change. This work demonstrates that the simultaneous responses of chirality, optics, and magnetism can be achieved in a single compound at room temperature and may open up a new pathway for designing chiral stimuli-responsive materials.

show abstract

Section: Discussionmentioning

confidence: 99%

Concomitant Photoresponsive Chiroptics and Magnetism in Metal-Organic Frameworks at Room Temperature

Xia

Gao

et al. 2021

Research

View full text Add to dashboard Cite

show abstract

“…Poly(3,4ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) 2.8% w/v dispersion in H2O was purchased from Merck. The Cu(BPDC) MOF thin-film (Copper Biphenyl-4,4 -Di-Carboxylic Acid) structures were prepared in a layer-by-layer fashion, following an optimized synthesis protocol published previously [18,41]. Alternatively, the samples were prepared by alternately exposing the substrate to the metal node and to the linker solutions, using a spray method [42].…”

Section: Chemicals and Fabrication Of Sensorsmentioning

confidence: 99%

“…As arrays of sensors, electronic noses (e-nose) have capability of discrimination of various gasses and their mixtures using machine learning techniques, such as Principal Component Analysis (PCA) [14,15], Linear Discriminant Analysis (LDA) [16], and k-Nearest Neighbor (k-NN) [17,18], using statistical analysis of large number of databases obtained from various sensing materials. Metal-oxides [19,20], semiconductors [21], and conducting polymers [22,23] have been used successfully as sensing films in various enose applications.…”

Section: Introductionmentioning

confidence: 99%

Identification of Mint Scents Using a QCM Based E-Nose

et al. 2021

Self Cite

View full text Add to dashboard Cite

Mints emit diverse scents that exert specific biological functions and are relevance for applications. The current work strives to develop electronic noses that can electronically discriminate the scents emitted by different species of Mint as alternative to conventional profiling by gas chromatography. Here, 12 different sensing materials including 4 different metal oxide nanoparticle dispersions (AZO, ZnO, SnO2, ITO), one Metal Organic Frame as Cu(BPDC), and 7 different polymer films, including PVA, PEDOT:PSS, PFO, SB, SW, SG, and PB were used for functionalizing of Quartz Crystal Microbalance (QCM) sensors. The purpose was to discriminate six economically relevant Mint species (Mentha x piperita, Mentha spicata, Mentha spicata ssp. crispa, Mentha longifolia, Agastache rugosa, and Nepeta cataria). The adsorption and desorption datasets obtained from each modified QCM sensor were processed by three different classification models, including Principal Component Analysis (PCA), Linear Discriminant Analysis (LDA), and k-Nearest Neighbor Analysis (k-NN). This allowed discriminating the different Mints with classification accuracies of 97.2% (PCA), 100% (LDA), and 99.9% (k-NN), respectively. Prediction accuracies with a repeating test measurement reached up to 90.6% for LDA, and 85.6% for k-NN. These data demonstrate that this electronic nose can discriminate different Mint scents in a reliable and efficient manner.

show abstract

“…Recently, a sensor array made of Surface-Anchored Metal-Organic Frameworks (SURMOFs) was successful in the detection and discrimination of plant oil scents and their mixtures. [25,26] In the current work, 12 different sensing materials including metal oxide nanoparticle dispersions, SURMOFs and polymer thin films for the modification of QCM sensors allowed to discriminate six different Mint species. These included Pepper Mint, M. x piperita (PM), Horse Mint M. longifolia (MLF), Korean Mint Agastache rugosa (AR), Cat Mint Nepeta cataria (NCL), and even two chemotypes of the same species of Spearmint Mentha spicata var.…”

Section: Introductionmentioning

confidence: 98%

Study of Recycling and Treatment Methods Spent Pot Lining (SPL)

Shirmahd¹,

hafizi²,

Jamavari³

et al. 2020

Preprint

View full text Add to dashboard Cite

In this study, a summary of the processes performed on the SPL for recycling, reduction in toxicity and treatment were examined on an industrial and laboratory scale. In writing this research, an attempt has been made to address the useful processes that have taken place in this field. Spent pot lining or SPL is a type of solid waste that is produced in the aluminum production process. After 3 to 8 years, the cathode blocks become problematic and can no longer be used, and need to be replaced due to adverse effects on cell function. SPL is known to be a hazardous waste to nature due to its fluoride and cyanide content. Research has shown that SPL ingredients have destructive and very dangerous effects on human DNA, which is why they are so important to maintain and recycle.

show abstract

Eine enantioselektive elektronische Nase: Ein Array nanoporöser homochiraler MOF‐Filme zur stereospezifischen Erkennung chiraler Geruchsmoleküle

Cited by 8 publications

References 58 publications

Concomitant Photoresponsive Chiroptics and Magnetism in Metal-Organic Frameworks at Room Temperature

Concomitant Photoresponsive Chiroptics and Magnetism in Metal-Organic Frameworks at Room Temperature

Identification of Mint Scents Using a QCM Based E-Nose

Study of Recycling and Treatment Methods Spent Pot Lining (SPL)

Contact Info

Product

Resources

About