Two new CdII MOFs of 1, 4‐bis(1H‐benzimidazol‐1‐yl)butane and flexible dicarboxylate ligands: luminescence sensing towards Fe3+. Issue 11 (22nd October 2020)

• Record Type: Journal Article
• Authors: Zhao, Fang-Hua; Li, Shi-Yao; Guo, Wen-Yu; Zhao, Zi-Hao; Guo, Xiao-Wen; Li, Yu-Shuo; Fan, Sheng-Qing; Li, Zhong-Lin
• Is Part Of: Acta crystallographica. Volume 76:Issue 11(2020)
• Page Start: 1024
• Page End: 1033
• Publication Date: 2020-10-22
• Subjects: MOF -- cadmium(II) -- crystal structure -- water cluster -- sql net -- hex net -- luminescence sensing -- pimelate -- sebacate -- dicarboxylic acid; Crystallography -- Periodicals; Crystals -- Periodicals; 548.3
• DOI: 10.1107/S2053229620013698
• Languages: English
• ISSNs: 2053-2296

Abstract

Abstract : Two new Cd II MOFs based on 1, 4‐bis(1 H ‐benzimidazol‐1‐yl)butane and pimelate/sebacate (Pim/Seb) mixed ligands have been synthesized under hydrothermal conditions. Structure analysis reveals that the Pim MOF is a 2D sql layer structure containing a (H2 O)8 water cluster. The Seb MOF shows an 8‐connected hex supramolecular structure based on the hxl layer. Luminescence sensing studies reveal that both MOFs have good selectivity and sensitivity for the detection of the Fe 3+ cation in water. Abstract : Two new Cd II MOFs, namely, two‐dimensional (2D) poly[[[μ2 ‐1, 4‐bis(1 H ‐benzimidazol‐1‐yl)butane](μ2 ‐heptanedioato)cadmium(II)] tetrahydrate], {[Cd(C7 H10 O4 )(C18 H18 N4 )]·4H2 O} n or {[Cd(Pim)(bbimb)]·4H2 O} n (1 ), and 2D poly[diaqua[μ2 ‐1, 4‐bis(1 H ‐benzimidazol‐1‐yl)butane](μ4 ‐decanedioato)(μ2 ‐decanedioato)dicadmium(II)], [Cd2 (C10 H16 O4 )2 (C18 H18 N4 )(H2 O)2 ] n or [Cd(Seb)(bbimb)0.5 (H2 O)] n (2 ), have been synthesized hydrothermally based on the 1, 4‐bis(1 H ‐benzimidazol‐1‐yl)butane (bbimb) and pimelate (Pim 2−, heptanedioate) or sebacate (Seb 2−, decanedioate) ligands. Both MOFs were structurally characterized by single‐crystal X‐ray diffraction. In 1, the Cd II centres are connected by bbimb and Pim 2− ligands to generate a 2D sql layer structure with an octameric (H2 O)8 water cluster. The 2D layers are further connected by O—H…O hydrogen bonds, resulting in a three‐dimensional (3D) supramolecular structure. In 2, the Cd II centres are coordinated by Seb 2− ligands to form binuclear Cd2 units which are linked by bbimb and Seb 2− ligands into a 2D hxl layer. The 2D layers are further connected by O—H…O hydrogen bonds, leading to an 8‐connected 3D hex supramolecular network. IR and UV–Vis spectroscopy, thermogravimetric analysis and solid‐state photoluminescence analysis were carried out on both MOFs. Luminescence sensing experiments reveal that both MOFs have good selective sensing towards Fe 3+ in aqueous solution.