Subppm Amine Detection via Absorption and Luminescence Turn-On Caused by Ligand Exchange in Metal Organic Frameworks

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Sousaraei, A (Author) Other; Queiros, C (Author) Other; Moscoso, FG (Author) Other; Tania, C (Author) Other; Pedrosa, JM (Author) Other; Silva, AMG (Author) FCUP; Cunha Silva, L (Author) FCUP; Cabanillas Gonzalez, J (Author) Other

Journal

Title: Analytical Chemistry

Vol. 91

ISSN: 0003-2700

Publisher: American Chemical Society

Indexing

ISI Web of Knowledge - 33 Citations

Scopus - 33 Citations

Other information

Authenticus ID: P-00R-EN8

DOI: 10.1021/acs.analchem.9b04291

Abstract (EN): Luminescent metal-organic frameworks (LMOFs) are promising materials for lighting and sensing applications. Herein, exposure of the highly luminescent Zn-2(bpdc)(2)(bpee) MOF (H(2)bpdc = 4,4'-biphenyldicarboxylic acid and bpee = 1,2-bipyridylethene) to subppm amine contents turns on a new absorption band unambiguously ascribed to free bpee molecules concomitant with the gradual appearance of a new photoluminescence band at shorter wavelengths. These findings combined with Fourier-transform infrared spectra, powder X-ray diffraction and thermogravimetric analysis of exposed LMOF powders confirm that bpee ligands are exchanged by amines and released inside the LMOF, triggering absorption and luminescence features which can be exploited for highly sensitive amine recognition. This principle was demonstrated in mixed matrix membranes (MMMs) prepared by a simple solvent-free method consisting of mixing Zn-2(bpdc)(2)(bpee) with dimethylvinyl-terminated dimethylsiloxane and dimethylhydrogen siloxane. This method enabled the production of free-standing, permeable, and highly transparent MMMs which showed enormous potential and sensitivity to the detection of amines in gas phase and aqueous medium.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7