Unprecedented ultralow detection limit of amines using a thiadiazole-functionalized Zr(IV)-based metal-organic framework
Emwas, Abdul-Hamid M.
Mohammed, Omar F.
KAUST DepartmentAdvanced Membranes and Porous Materials Research Center
Chemical Science Program
Functional Materials Design, Discovery and Development (FMD3)
KAUST Solar Center (KSC)
Physical Sciences and Engineering (PSE) Division
Online Publication Date2019-04-15
Print Publication Date2019-05-08
Permanent link to this recordhttp://hdl.handle.net/10754/631977
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AbstractA luminescent Zr(IV)-based MOF, with the underlying fcu topology, encompassing a π-conjugated organic ligand with a thiadiazole functionality, exhibits an unprecedented low detection limit of 66 nanomolar (nM) for amines in aqueous solution. Markedly, this ultra-low detection is driven by the hydro-gen bonding interactions between the linker and amines. This observation is fully supported by Density Functional Theory (DFT) calculations which clearly corroborate the suppression of the twisting motion of the thiadiazole core in the presence of amine, reducing significantly the non-radiative recombination pathways and subsequently enhancing the emission intensity. Credibly, nicotine regarded as a harmful chemical and bearing an amine pending group is also detected with high sensitivity, positioning this MOF as a potential sensor for practical environmental applications. This finding not only provides an unprecedented low detection limit, but also serves as a benchmark to understand the sensing mechanism in MOFs.
CitationMallick A, El-Zohry AM, Shekhah O, Yin J, jia jiangtao, et al. (2019) Unprecedented ultralow detection limit of amines using a thiadiazole-functionalized Zr(IV)-based metal-organic framework. Journal of the American Chemical Society. Available: http://dx.doi.org/10.1021/jacs.9b01839.
SponsorsThe authors gratefully acknowledge financial support from King Abdullah University of Science and Technology (KAUST). In the memory of Abdallah Eddaoudi.
PublisherAmerican Chemical Society (ACS)