An ultrastable zinc(ii)–organic framework as a recyclable multi-responsive luminescent sensor for Cr(iii), Cr(vi) and 4-nitrophenol in the aqueous phase with high selectivity and sensitivity. Issue 37 (14th September 2017)

• Record Type: Journal Article
• Authors: Guo, Xiao-Yu; Zhao, Fei; Liu, Jing-Juan; Liu, Zhi-Liang; Wang, Yan-Qin
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 37(2017)
• Page Start: 20035
• Page End: 20043
• Publication Date: 2017-09-14
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7ta05896a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : An ultrastable Zn-MOF shows recyclable and multi-responsive sensing for Cr(iii ), Cr(vi ) and 4-nitrophenol in an aqueous system with high selectivity and sensitivity. Abstract : A 2D zinc(ii ) metal–organic framework (Zn-MOF-1 ) formulated as [Zn(L)(H2 O)]·H2 O (1 ) (H2 L = 5-(2-methylpyridin-4-yl)isophthalic acid) with blue fluorescence has been successfully obtained under hydrothermal conditions. Zn-MOF-1 contains microporous parallelogram channels with accessible Lewis-base sites, coordinated water molecules and uncoordinated carboxylates, which are easy to anchor and recognise various analytes. The fluorescence investigations demonstrated that the blue-light-emitting behaviour of Zn-MOF-1 possesses excellent water and pH stability. More importantly, this is the first reported recyclable multi-responsive Zn-MOF fluorescence sensor for Cr(iii ), Cr(vi ) (CrO4 2− /Cr2 O7 2− ions) and 4-NP (4-nitrophenol) simultaneously with high selectivity and sensitivity and low detection limits in aqueous solution through fluorescence quenching. Furthermore, the mechanism for the selective sensing of Cr 3+, CrO4 2−, Cr2 O7 2− or 4-NP can mainly be explained by the competition between the absorption of the analytes and the excitation/emission of Zn-MOF-1, and the electronic interactions between Zn-MOF-1 and the analytes.