Cobalt-Based Metal-Organic Frameworks and Its Mixed-Matrix Membranes for Discriminative Sensing of Amines and On-Site Detection of Ammonia

T. Leelasree, Mudit Dixit, Himanshu Aggarwal

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Developing suitable materials that can differentiate between chemically similar substances such as aliphatic and aromatic amines is challenging. Aliphatic and aromatic amines vary considerably in size and electronic properties despite possessing the same functional group. This makes the entire separation process more tedious. Metal-organic frameworks known for their inherent permanent porosity can be designed using appropriate building blocks that can lead to multifunctional materials. Here we utilize two Co-based multifunctional MOFs for discriminative sensing of amines and on-site detection of ammonia. Both the MOF materials display unique fluorescence behavior where aliphatic amines lead to "turn-off", and aromatic amines show "turn-on"fluorescence intensities of the two MOFs. Real-time sensing experiments with MOF-based mixed matrix membranes show an instant color change when ammonia is liberated from a chemical reaction. Density functional theory calculations unravel that the aliphatic and aromatic amines interact with the MOF structures in different ways that lead to "turn-off"and "turn-on"fluorescence behavior, respectively.

Original languageEnglish
JournalChemistry of Materials
DOIs
StateAccepted/In press - 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2023 American Chemical Society.

Funding

H.A. thanks StartUp Research grant of SERB (grant sanction order number SRG/2019/000952) and BITS-Pilani, Hyderabad (Additional competitive grant) for funding. Authors also thank Central Analytical Laboratory at BITS-Pilani, Hyderabad campus for the characterization facilities. M.D. acknowledges the Core Research Grant (CRG/2020/005626) of SERB, India for financial support toward the completion of the computational part of this work.

FundersFunder number
Science and Engineering Research BoardCRG/2020/005626, SRG/2019/000952

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