An effective strategy for carbon encapsulation was developed to increase the capacitive performance of WO3−x nanowires as a high-energy and stable anode material for flexible asymmetric supercapacitors.

No abstract

No abstract

Source of materialAm ixture of 1,4-cyclohexanedicarboxylic acid (H 2 chdc, 0.5 . mmol), 1,2-bis(imidazole-1-ylmethyl)benzene (1,2-bix, 0.5 .mmol), and CdCl2.·.2H2O( 0.5 mmol) was suspended in a solution of deionized water (12 ml) and sealed in a20mlTeflon-lined autoclave. Upon heating at 140°Cfor two days, the autoclave was slowly cooled to room temperature. The crystals were collected, washed with deionized water and dried. Experimental detailsHydrogen atoms on carbon atoms were generated geometrically and refined as riding atoms with d(C-H) =0.93 Å and U iso(H) = 1.2 U eq(C). The Hatoms of the water molecules were not located. DiscussionThe design and synthesis of metal-organic coordination polymers have attracted intense interests of chemists [1]. The selection of ligand is extremely important because changing their conformations can control the topology of the resulting coordination framework [1]. While the rigid rod-like spacer, 4,4'-bipyridine, is well known in the construction of metal-organic polymers, flexible N-donor ligands such as 1,2-bix have not been so well explored [2]. The asymmetric unit of the title crystal structure comprises aCd 2+ cation, achloride anion, half achdc dianion, half awater molecule, and one 1,2-bix molecule. Each Cd atom is six-coordinated by three carboxylate oxygen atoms from two different chdc anions, one chlorine ,and two nitrogen atoms from two distinct 1,2-bix ligands in adistorted octahedral sphere. Each chdc ligand bridges apair of Cd atoms to form achain structure.

No abstract