Dual-responsive luminescent sensors based on two Cd-MOFs: rare enhancement toward acac and quenching toward Cr2O72−. Issue 22 (17th May 2020)

• Record Type: Journal Article
• Authors: Yu, Yu'e; Wang, Yuhao; Xu, Haijun; Lu, Jing; Wang, Huaiwei; Li, Dacheng; Dou, Jianmin; Li, Yunwu; Wang, Suna
• Is Part Of: CrystEngComm. Volume 22:Issue 22(2020)
• Page Start: 3759
• Page End: 3767
• Publication Date: 2020-05-17
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/d0ce00405g
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Two luminescent Cd-MOFs were employed as dual-responsive luminescence sensors to detect acac and Cr2 O7 2− through turn-on and turn-off mechanisms. Abstract : Assembled from a reduced Schiff base tricarboxylate ligand H3 L, two novel Cd-MOFs with the formulae {[Cd(HL)(bpy)]·1.25H2 O·1.5DMF} n (LCU-107 ) and {[Cd(HL)(bpea)·H2 O]·H2 O·DMF} n (LCU-108 ) (where LCU stands for Liaocheng University, H3 L = 5-(4-carboxybenzylamino)isophthalic acid, bpy = 4, 4′-bipyridine, and bpea = 1, 2-di(4-pyridyl)ethane), were obtained. LCU-107 possesses a 3D pcu framework based on dinuclear units. LCU-108 demonstrates an interesting 2D → 2D interdigitating and penetrating structure. The flexible carboxylate ligands can all bend in these complexes due to the rotation of –CH2 –NH– groups. Luminescence measurements indicated that these two Cd-MOFs show highly selective and sensitive sensing activities toward acetylacetone (acac) and Cr2 O7 2− through a luminescence enhancement and a quenching effect, respectively. The detection limits toward acac are as low as 0.136 and 0.058 ppm, respectively. To our knowledge, these two Cd-MOFs may represent very rare examples of special turn-on acac sensors, as well as being dual-responsive chemosensors for both acac and Cr2 O7 2− .