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Indexed by:期刊论文

Date of Publication:2016-08-01

Journal:CRYSTAL GROWTH & DESIGN

Included Journals:SCIE、EI、Scopus

Volume:16

Issue:8

Page Number:4539-4546

ISSN No.:1528-7483

Abstract:Self-assembly reactions of Zn2+ and L5- (H5L = 2,5-(6-(4-carboxyphenylamino)-1,3,5-triazine-2,4-diyldiimino)diterephthalic acid)lead to the formation of two new ABW-type zeolitic metal-organic frameworks (Z-MOFs): (Me2NH2)[Zn2L]-3.5DMF (Me2NH2)[Zn2L(H2O)]. 2DMF-8H(2)O (2) (DMF = N,N-dimethylformamide). They are the first two Z-MOFs which are built of the same pentacarboxylate ligand and metal ion :but haver two configurations and channel shapes(distorted honeycomb and herringbone-shaped Channels for,1 and 2 respectively)., They can demonstrate interesting structural transformations triggered by vacuum heating or Soaking in different solvents: While direct transformations between 1 and 2 were revealed to be not feasible, 2 could be first transformed :to a crystalline intermediate 3 and then into 1. Furthermore, while transformations between 2 and 3 are irreversible, those between 1 and 3 are reversible, accompanied by a 26 nm shift of their emission peak positions. In comparison to the ligand, 1, 2, and 3 exhibit blue shifts in their luminescent emission peaks and have intensive blue emission in both Solid and "solution phases. The efficient and selective quenching of their photoluminescence by a series of nitroaromatics (NACs) solutions phase and by nitrobenzene (NB) vapor makes them promising probes for detecting NAcs. 1, 3 represent the first series of MOFs as promising photoluminescent probes for detecting dinoseb down to 2.4 ppm. The electron transfer; long-range energy transfer, and/or electrogtatic interactions between the frameworks and NACs mainly contribute to the quenching mechanisms.