Band gap, sorption properties and fluorescence sensing behaviour of a novel 1D→2D cathenane‐like cobalt(II)–organic framework

A novel hydrolytic stable CoII–organic framework, namely poly[[bis(2‐amino‐4‐sulfonatobenzoato‐κO1)tetraaquatris{μ‐1,4‐bis[(imidazol‐1‐yl)methyl]benzene‐κ2N3:N3′}dicobalt(II)] tetrahydrate], {[Co(C7H5NO5S)(C14H14N4)1.5(H2O)2]·2H2O}n, (1), based on multifunctional 2‐amino‐5‐sulfobenzoic acid (H2asba)...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Acta crystallographica. Section C, Crystal structure communications Crystal structure communications, 2019-12, Vol.75 (12), p.1593-1604
Hauptverfasser: Zhang, Chong, Zhang, Qing-Hong, Zhang, Kou-Lin
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:A novel hydrolytic stable CoII–organic framework, namely poly[[bis(2‐amino‐4‐sulfonatobenzoato‐κO1)tetraaquatris{μ‐1,4‐bis[(imidazol‐1‐yl)methyl]benzene‐κ2N3:N3′}dicobalt(II)] tetrahydrate], {[Co(C7H5NO5S)(C14H14N4)1.5(H2O)2]·2H2O}n, (1), based on multifunctional 2‐amino‐5‐sulfobenzoic acid (H2asba) and the auxiliary flexible ligand 1,4‐bis[(imidazol‐1‐yl)methyl]benzene (bix), was prepared using the solution evaporation method. The purity of (1) was confirmed by elemental analysis and powder X‐ray diffraction (PXRD) analysis. Complex (1) shows a novel 1D→2D interpenetrating network, which is further extended into a 3D supramolecular framework with channels occupied by the lattice water molecules. The 2‐amino‐4‐sulfonatobenzoate (asba2−) ligand adopts a monodentate coordination mode. The bix ligands exhibit gauche–gauche (GG) and trans–trans (TT) conformations. A detailed analysis of the solid‐state diffuse‐reflectance UV–Vis spectrum reveals that an indirect band gap exists in the complex. The band structure, the total density of states (TDOS) and the partial density of states (PDOS) were calculated using the CASTEP program. The calculated band gap (Eg) matches well with the experimental one. The complex exhibits a reversible dehydration–rehydration behaviour. Interestingly, gas sorption experiments demonstrate that the new fully anhydrous compound obtained by activating complex (1) at 400 K shows selective adsorption of CO2 over N2. Complex (1) retains excellent framework stability in a variety of solvents and manifests distinct solvent‐dependent fluorescence properties. Moreover, the complex shows multiresponsive fluorescence sensing for some nitroaromatics in aqueous medium. A novel multifunctional 1D→2D interpenetrating CoII–organic framework was successfully constructed using 2‐amino‐5‐sulfobenzoic acid and 1,4‐bis[(imidazol‐1‐yl)methyl]benzene as ligands.
ISSN:2053-2296
0108-2701
2053-2296
1600-5759
DOI:10.1107/S2053229619014669