Distinct solvent-dependent luminescence sensing property of a newly constructed Cu(ii)–organic framework. Issue 9 (12th February 2021)

• Record Type: Journal Article
• Authors: Zhu, Jin-Long; Zhu, Peizhi; Chen, Hai-Tao; Yan, Min; Zhang, Kou-Lin
• Is Part Of: CrystEngComm. Volume 23:Issue 9(2021)
• Page Start: 1929
• Page End: 1941
• Publication Date: 2021-02-12
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/d0ce01724h
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : The distinct solvent-dependent fluorescence sensing behavior of an extremely rare Cu(ii ) MOF, showing the fluorescent "turn-off" sensing of Fe 3+ and HCO3 − in DMF and "turn-on" sensing of Al 3+ in water. Abstract : A novel luminescent Cu(ii )–organic framework, {[Cu(asba)(3bpmo)0.5 (H2 O)]·H2 O} n (1 ), was obtained through the assembly between copper(ii ) and 2-amino-5-sulfobenzoic acid (H2 asba) in the presence of an auxiliary flexible ligand, N, N ′-bis(3-pyridylmethyl)oxalamide (3bpmo). 1 is a 2D (6, 3) topological network, which further extends into a 3D supramolecular network via hydrogen and chalcogen bonds. An indirect bandgap exists in 1 . 1 shows high framework stability in common solvents and reversible dehydration–rehydration behaviour. Remarkably, 1 is an especially rare example that exhibits novel solvent-dependent luminescence sensing properties. In DMF, 1 shows selective and sensitive fluorescence "turn-off" sensing of Fe 3+ over a number of coexistent metal cations. 1 could also be used as a potential selective and sensitive probe for HCO3 − among a variety of interfering anions. Furthermore, 1 shows discriminative sensing of HCO3 − over CO3 2− . In water, 1 shows a quite different fluorescence sensing behaviour from that in DMF. 1 cannot sense Fe 3+ and HCO3 − in aqueous medium. It is fascinating that 1 shows selective and efficient fluorescence "turn-on" sensing of Al 3+ accompanied by a bathochromic shift of the emission peak in water. The limit of detection (LOD) for Al 3+ reaches the 0.80 μM (0.02 ppm) level.