title: Systematic Investigation of High-Sensitivity Luminescent Sensing for Polyoxometalates and Iron(III) by MOFs Assembled with a New Resorcin[4]arene-Functionalized Tetracarboxylate.
abstract: A new family of resorcin[4]arene-based metal-organic frameworks (MOFs), namely, [Eu(HL)(DMF)(H2 O)2 ]⋅3 H2 O (1), [Tb(HL)(DMF)(H2 O)2 ] 3 H2 O (2), [Cd4 (L)2 (DMF)4 (H2 O)2 ] 3 H2 O (3) and [Zn3 (HL)2 (H2 O)2 ] 2 DMF⋅7 H2 O (4), have been constructed from a new resorcin[4]arene-functionalized tetracarboxylic acid (H4 L=2,8,14,20-tetra-ethyl-6,12,18,24-tetra-methoxy-4,10,16,22-tetra-carboxy-methoxy-calix[4]arene). Isostructural 1 and 2 exhibit charming 1D motifs built with the cup-like HL(3-) anions and rare earth cations. Compounds 3 and 4 show a unique sandwich-based 2D layer and a fascinating 3D framework, respectively. Remarkably, compounds 1 and 2 display intensive red and green emissions triggered by the efficient antenna effect of organic ligands under UV light. More importantly, systematic luminescence studies demonstrate that Ln-MOFs 1 and 2, as efficient multifunctional fluorescent materials, show highly selective and sensitive sensing of Fe(3+) , polyoxometalates (POMs), and acetone, which represents a rare example of a sensor for quantitatively detecting three different types of analytes. This is also an exceedingly rare example of Fe(3+) and POMs detection in aqueous solutions employing resorcin[4]arene-based luminescent Ln-MOFs. Furthermore, the possible mechanism of the sensing properties is deduced.
authors.affiliation: Key Laboratory of Polyoxometalate Science, Department of Chemistry, Northeast Normal University, Changchun 130024 (P.R. China), Fax: (+86) 431-85098620.
authors.forename: Shuai-Tong
authors.initials: ST
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Polyoxometalate Science, Department of Chemistry, Northeast Normal University, Changchun 130024 (P.R. China), Fax: (+86) 431-85098620. yangj808@nenu.edu.cn.
authors.forename: Jin
authors.initials: J
authors.lastname: Yang
authors.affiliation: College of Science, Nanjing Agricultural University, Nanjing 210095 (P.R. China).
authors.forename: Hua
authors.initials: H
authors.lastname: Wu
authors.affiliation: Key Laboratory of Polyoxometalate Science, Department of Chemistry, Northeast Normal University, Changchun 130024 (P.R. China), Fax: (+86) 431-85098620.
authors.forename: Ying-Ying
authors.initials: YY
authors.lastname: Liu
authors.affiliation: Key Laboratory of Polyoxometalate Science, Department of Chemistry, Northeast Normal University, Changchun 130024 (P.R. China), Fax: (+86) 431-85098620. majf247@yahoo.com.
authors.forename: Jian-Fang
authors.initials: JF
authors.lastname: Ma
keywords: crystal structure; iron; luminescence; metal-organic frameworks; polyoxometalates; sensors