H-Bonding Interactions Induced Two Isostructural Cd(II) Metal-Organic Frameworks Showing Different Selective Detection of Nitroaromatic Explosives

Zhong-Jie Wang; Ling Qin; Jin-Xi Chen; He-Gen Zheng

doi:10.1021/acs.inorgchem.6b01521

H-Bonding Interactions Induced Two Isostructural Cd(II) Metal-Organic Frameworks Showing Different Selective Detection of Nitroaromatic Explosives

Inorg Chem. 2016 Nov 7;55(21):10999-11005. doi: 10.1021/acs.inorgchem.6b01521. Epub 2016 Oct 21.

Authors

Zhong-Jie Wang¹, Ling Qin¹, Jin-Xi Chen², He-Gen Zheng¹

Affiliations

¹ State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, P. R. China.
² School of Chemistry and Chemical Engineering, Southeast University , Nanjing 211189, P. R. China.

PMID: 27767307
DOI: 10.1021/acs.inorgchem.6b01521

Abstract

Two luminescent Cd(II) metal-organic frameworks (MOFs) were prepared from electron-rich π-conjugated fluorescent ligands. They are isostructural with sql nets. Their strong luminescences can be quenched by a series of nitroaromatic explosives. Notably, MOF 1 shows highly selective and sensitive detection of 4-nitrophenol (4-NP), while MOF 2 exhibits good responses toward picric acid (PA) compared with other nitroaromatic explosives. This different order of quenching efficiency is because there are H-bonding interactions between MOF 1 and 4-NP, while MOF 2 lacks these H-bonding interactions. MOF 1 displays highly selective and sensitive detection of 4-NP with the high quenching constant (6.74× 10⁴ M^-1) and low detection limit (34.48 ppb), which is better than those of known MOFs. MOF 1 and MOF 2 have highly sensitive and selective detection of 4-NP and PA in the practical application, respectively.