Dicarboxylic ligands directing two Zn(II)-organic frameworks with distinct structures and significantly enhanced luminescence detection performances. (December 2021)

• Record Type: Journal Article
• Authors: Zhang, Jinfang; Qiu, Qingxia; Xiang, Qian; Li, Wenjing; Lin, Zhuo; Zhang, Chi
• Is Part Of: Dyes and pigments. Volume 196(2022)
• Publication Date: 2021-12
• Subjects: Zn(II)-Organic frameworks -- Dicarboxylic ligands -- Efficient dual-response sensor -- Enhanced detection performances; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2021.109760
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: Choosing different dicarboxylic ligands to construct MOFs with different structures and significantly improved luminescence detection properties has been studied. [Zn(L)(BDC)]n (1 ), [Zn4 (L)4 (ISO)4 ]n (2 ) (L = 1, 4-Bis(4-pyridyl)naphthalene, H2 BDC = terephthalic acid, H2 ISO = isophthalic acid) have been successfully synthesized and characterized. Their structural features vary from a 3D pillar-layered 5-fold interpenetrated dia framework (1 ) to a 2D double-layered non-interpenetrated sql net (2 ). The different structures between 1 and 2 can be attributed to distinct bridging angles from dicarboxylic ligands. Furthermore, luminescent sensing experiments exhibit that 1 and 2 are efficient dual-responsive sensors for the detection of acetylacetone (acac) and Cr2 O7 2− . Especially, 2 performs very highly sensitive quenching response towards acac in aqueous medium. More interestingly, 2 exhibits significantly enhanced quenching efficiencies than 1 (Ksv of detecting acac: 7.87 × 10 3 M −1 for 1 and 4.9 × 10 4 M −1 for 2 ; Ksv of detecting Cr2 O7 2− : 3.95 × 10 3 M −1 for 1 and 1.41 × 10 4 M −1 for 2 ). The cause for higher quenching efficiencies of 2 has been preliminary discussed. The efficient luminescence quenching mechanisms of 1/2 towards acac/Cr2 O7 2− have been elucidated. Graphical abstract: Dicarboxylic ligands with distinct bridging angles direct two Zn(Ⅱ)-MOFs with different structures and significantly improved luminescence detection properties. Image 1 Highlights: Dicarboxylic ligands with distinct bridging angles direct two Zn(Ⅱ)-MOFs with different structures and luminescence detection properties 1 And 2 show efficient luminescent dual-responsive sensing towards acac and Cr2 O7 2− in aqueous media. 2 Perform very highly sensitive quenching response towards acac. 2 Exhibits significant enhanced quenching efficiencies compared to 1. The sensing mechanisms towards acac and Cr2 O7 2− were studied as well.