A three-dimensional (3D) copper-based coordination polymer, ([Cu(H 2 mpca)-(tfbdc)], Cu-CP; H 2 mpca = 3-methyl-1H-pyrazole-4-carboxylic acid; H 2 tfbdc = 2,3,5,6tetrafluoroterephthalic acid), has been synthesized and characterized by IR spectroscopy, thermogravimetric analysis, elemental analysis, and single-crystal X-ray diffraction. In Cu-CP, each Cu(II) ion is located in a triangular bipyramid geometry, and these Cu(II) ions are linked by tfbdc 2− ligands to produce a 3D network. Variable-temperature magnetic susceptibility data display that weak antiferromagnetic interactions between the adjacent Cu (II) ions exist in Cu-CP. Cu-CP was evaluated as an electrode material for supercapacitors. It displayed a higher specific capacitance of 735 F g −1 in 1 M KOH solution at a current density of 1 A g −1 and remained at 375 F g −1 after 1500 cycles at 2 A g −1 .

For the development of supercapacitors with higher energy densities, metal-organic frameworks (MOFs),

The finding of new coordination polymers with high anodic performance and the insight into their electrochemical mechanism is of considerable importance to advance their application in lithium-ion batteries (LIBs). Herein, [Mn(tfbdc)-(Im) 4 ] (Mn-TBI), a one-dimensional (1D) coordination polymer, has been constructed from Mn(Ac) 2 , imdazole (Im), and tetrafluoroterephthalic acid (H 2 tfbdc). When tested as an anode material of LIBs, Mn-TBI delivers a high capacity of 525 mAh g −1 with a Coulombic efficiency of 95% after 150 cycles at 50 mA g −1 . Even at 1 A g −1 , Mn-TBI remains, with a capacity of 209 mAh g −1 . The studies of ex situ X-ray photoelectron spectroscopy and FT-IR spectra for the Mn-TBI electrode under different states reveal that the ligands and Mn(II) ions may all participate in the electrochemical reaction of the charging/discharging process. It is a practical route to discover new anode materials for LIBs from 1D coordination polymers.

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