Tuning oxygen-sensing behaviour of a porous coordination framework by a guest fluorophore. Issue 12 (13th October 2015)

• Record Type: Journal Article
• Authors: Lin, Rui-Biao; Zhou, Hao-Long; He, Chun-Ting; Zhang, Jie-Peng; Chen, Xiao-Ming
• Is Part Of: Inorganic chemistry frontiers. Volume 2:Issue 12(2015)
• Page Start: 1085
• Page End: 1090
• Publication Date: 2015-10-13
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c5qi00157a
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : A new oxygen-sensing material with desirable excitation/emission characteristics was achieved by using a simple guest fluorophore. Abstract : Tris(8-hydroxyquinolinato)aluminium (AlQ3 ), a classic fluorescent molecule insensitive to oxygen, is encapsulated as a guest fluorophore into a highly porous coordination framework [Zn4 O(bpz)2 (bdc)] (MAF-X10, H2 bpz = 3, 3′, 5, 5′-tetramethyl-4, 4′-bipyrazole, H2 bdc = 1, 4-benzenedicarboxylic acid) to obtain a highly luminescent host–guest hybrid material AlQ3 @MAF-X10 combining the advantages of excellent fluorescence of AlQ3, high oxygen permeability of MAF-X10, and the resonance energy transfer between AlQ3 and MAF-X10. Photoluminescence studies showed that AlQ3 @MAF-X10 exhibits yellowish green fluorescence with a Stokes shift (9606 cm −1 ) as large as those of phosphorescent noble metal complexes, long lifetime (37.4 ns) and a considerable oxygen permeability (4.4 × 10 −9 mol cm −1 s −1 bar −1 ), giving rise to high oxygen sensitivity (88.5% quenched at 1 bar, i.e., I 0 / I 100 = 8.7, K SV = 7.6 bar −1 ) with fast response and good reversibility.