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

• Published in: Dyes and pigments 2021-12, Vol.196, p.109760, Article 109760
• Main Authors: Zhang, Jinfang, Qiu, Qingxia, Xiang, Qian, Li, Wenjing, Lin, Zhuo, Zhang, Chi
• Format: Article
• Language: English
• Subjects: Dicarboxylic ligands; Efficient dual-response sensor; Enhanced detection performances; Zn(II)-Organic frameworks
• ISSN: 0143-7208; 1873-3743
• DOI: 10.1016/j.dyepig.2021.109760

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, H2BDC = terephthalic acid, H2ISO = 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 Cr2O72−. 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 × 103 M−1 for 1 and 4.9 × 104 M−1 for 2; Ksv of detecting Cr2O72−: 3.95 × 103 M−1 for 1 and 1.41 × 104 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/Cr2O72− have been elucidated. Dicarboxylic ligands with distinct bridging angles direct two Zn(Ⅱ)-MOFs with different structures and significantly improved luminescence detection properties. [Display omitted] •Dicarboxylic ligands with distinct bridging angles direct two Zn(Ⅱ)-MOFs with different structures and luminescence detection properties• 1And 2 show efficient luminescent dual-responsive sensing towards acac and Cr2O72− in aqueous media.• 2Perform very highly sensitive quenching response towards acac.• 2Exhibits significant enhanced quenching efficiencies compared to 1.•The sensing mechanisms towards acac and Cr2O72− were studied as well.