In:
New Journal of Chemistry, Royal Society of Chemistry (RSC), Vol. 45, No. 48 ( 2021), p. 22915-22923
Abstract:
A novel Zn 2+ -based metal–organic framework (MOF) with the formula {[Zn(μ 2 -η 1 :η 1 -BBIP)(μ 2 -η 1 :η 1 :η 1 -OBA)]·3H 2 O} n , denoted as JXUST-7, has been successfully assembled using semi-rigid N-donor 3,5-bis(benzimidazol-1-yl)pyridine (BBIP) and flexible 4,4′-oxybisbenzoate (H 2 OBA). The adjacent Zn 2+ ions are linked through an OBA 2− ligand with a μ 2 -η 1 :η 1 :η 1 bridging mode to form an infinite one-dimensional (1D) Zn 2+ –OBA 2− chain. The neighbouring 1D chains are further connected by a BBIP ligand with a μ 2 -η 1 :η 1 bridging mode to gain a two-dimensional (2D) sheet layer structure. Topological analysis indicates that the whole 2D structure of JXUST-7 could be simplified as a uninodal sql topology with a point symbol of {4 4 ·6 2 }. Furthermore, the opposite parallel 2D layers are further packed by a face-to-face π–π interaction to generate a three-dimensional supramolecular structure. Luminescence experiments reveal that JXUST-7 could be considered as a multi-responsive MOF-based fluorescent probe toward Fe 3+ , Cr 2 O 7 2− and acetylacetone (acac) via the fluorescence quenching (turn-off) effect. The detection limits for Fe 3+ , Cr 2 O 7 2− and acac are 0.14, 1.33 and 6.53 ppm, respectively. The fluorescence quenching mechanism was analyzed in detail by powder X-ray diffraction, fluorescence lifetime measurement, X-ray photoelectron spectra, theoretical calculation and UV-Vis absorption spectra. More importantly, JXUST-7 could be cyclically utilized at least five times for detecting Fe 3+ , Cr 2 O 7 2− and acac.
Type of Medium:
Online Resource
ISSN:
1144-0546
,
1369-9261
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2021
detail.hit.zdb_id:
1472933-7
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