Synthesis, structures, and fluorescent properties of four new calcium(II) metal–organic frameworks. (15th November 2018)

• Record Type: Journal Article
• Authors: Wang, Yutong; Fan, Weidong; Wang, Xia; Liu, Di; Huang, Zhaodi; Dai, Fangna; Gao, Jing
• Is Part Of: Polyhedron. Volume 155(2018)
• Page Start: 261
• Page End: 267
• Publication Date: 2018-11-15
• Subjects: Fluorescent property -- Metal–organic frameworks -- Calcium(II) MOF -- Three dimensional framework -- Azo complex; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2018.08.025
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: Four metal–organic frameworks with 1D chain and binuclear SBUs have been synthesized by four rigid, linear ligands. The ligands' effects and luminescence properties were studied. Abstract: Four calcium(II) metal–organic frameworks, [Ca(BD)DMF]·DMF·H2 O (1 ), [Ca2 (EDDA)(H2 O)2 (DMA)]·3H2 O (2 ), [Ca(TTD)(Diox)]·2H2 O (3 ), and [Ca2 (DBBD)(H2 O)2 (DMF)]·2DMF·H2 O (4 ) were designed and constructed by using four different carboxylate ligands, i.e., [2, 2′-bipyridine]-5, 5′-dicarboxylic acid (H2 BD), (E)-5, 5′-(diazene-1, 2-diyl) diisophthalic acid (H4 EDDA), 2′, 3′, 5′, 6′-tetramethyl-[1, 1′:4′, 1″-terphenyl]-4, 4″-dicarboxylic acid (H2 TTD), and (E)-4′, 4‴-(diazene-1, 2-diyl)bis(([1, 1′-biphenyl]-3, 5-dicarboxylic acid)) (H4 DBBD), respectively (DMF = N, N-Dimethylformamide; DMA = Dimethylacetamide; Diox = 1, 4-Dioxane). The differences in terms of lengths (6.95–17.68 Å), steric hindrance and configurations among the four ligands lead to four different structures of the final calcium complexes. In addition, the solid-state fluorescence of all the complexes have been studied at room temperature, showing shifted maximum emission bands or enhanced fluorescent properties compared to that of free organic ligands.