Multiterpyridyl Ligand/Cadmium(II) Coordination Polymer Nanosheets for Recoverable Luminescent Sensors

Abstract

A cadmium­(II) coordination polymer nanosheet (Cd-nanosheet) has been successfully constructed by a liquid–liquid interface-assisted method based on the coordination reaction between 1,3,5-tri­(4-(2,2’:6′,2″-terpyridyl)­phenyl)­benzene and cadmium­(II) nitrate. The Cd-nanosheet was characterized by elemental analysis, FT-IR spectroscopy, XPS, and fluorescence spectroscopy. The expected 2D lamellar structure was also confirmed by various microscopic techniques. The Cd-nanosheet is insoluble in aqueous and organic solvents. Due to its excellent fluorescence performance, we focus on its application in the detection of organic small molecules and metal ions. The luminescence quenching constant Ksv of the Cd-nanosheet for Cu2+ ions and nitrobenzene is 4.73 × 104 and 2.582 × 103 M–1, respectively. The results demonstrate that Cd-nanosheets can serve as detection sensors with high selectivity and sensitivity to detect nitrobenzene and Cu2+ ions.

Supercapacitors Based on Mixed Nickel/Cobalt 2D MOF Coordination Nanosheets for Energy Storage

“…The result indicates the presence of Co 2+ ions in the CoNi-nanosheet. As shown in Figure d, the N 1s peaks of the TPE-TPY ligand shifted from 398.5 to 399.25 eV, demonstrating the successful coordination of the tridentate terpyridyl groups with Co 2+ and Ni 2+ ions . The XPS spectra of the monometallic Ni-nanosheet and Co-nanosheet are shown in Figure S6b,c.…”

“…As shown in Figure 3d, the N 1s peaks of the TPE-TPY ligand shifted from 398.5 to 399.25 eV, demonstrating the successful coordination of the tridentate terpyridyl groups with Co 2+ and Ni 2+ ions. 35 The XPS spectra of the monometallic Ni-nanosheet and Conanosheet are shown in Figure S6b,c The galvanostatic charge−discharge (GCD) curves of the CoNi-nanosheet at different current densities with the corresponding capacities are shown in Figure 4b,c. The charge and discharge times for the CoNi-nanosheet were measured at a current density of 1 A g −1 as 463.7 and 403.4 s, respectively, indicating an asymmetric charge−discharge process.…”