Qiuping Han

Carbon-encapsulated tungsten oxide nanowires as a stable and high-rate anode material for flexible asymmetric supercapacitors

Herein, we report an effective carbon encapsulation strategy to boost the capacitive performance of WO3−x nanowires as a high-energy and stable anode material for flexible asymmetric supercapacitors (ASCs). The carbon-encapsulated WO3−x nanowires exhibited a remarkable areal capacitance of 786.8 mF cm−2 and excellent durability. Furthermore, an ASC device with high energy and power density was also fabricated from the as-prepared carbon encapsulated WO3−x nanowire anode.

Synthesis and crystal structure of a novel Mn(II) coordination polymer with 3-(4-(1H-benzo[d]imidazol-1-yl)-4-methoxyphenyl)-1-phenylprop-2-en-1-one ligands

Abstract3-(4-(1H-Benzo[d]imidazol-1-yl)-4-methoxyphenyl)-1-phenylprop-2-en-1-one (L1, 1) and its Mn(II) complex, [Mn(L1)2(SCN)2]∞ (2), were synthesized and characterized by elemental analyses, IR spectroscopy and single-crystal X-ray diffraction. The Mn(II) ion in 2 is six-coordinated to four nitrogen atoms of two L1 ligands, two SCN-ligands, and two oxygen atoms of other two L1 ligands to form a distorted octahedral geometry. Therefore, each L1 links Mn ions through the O and N atoms to generate 2D sheet structure.

catena-Poly[[tetra­kis­(1H-pyrazole-κN2)copper(II)]-μ-hexa­fluoridosilicato-κ2F:F′]

In the title one-dimensional coordination polymer, [Cu(SiF6)(C3H4N2)4]n, the CuII atom is coordinated by two hexafluoridosilicate F atoms and four pyrazole N atoms in a distorted trans-CuF2N4 octahedral environment. The dihedral angle between the planes of the pyrazlole rings in the asymmetric unit is 74.4 (3)°. The hexafluoridosilicate dianion acts as a bridging ligand, connecting the CuII atoms into a [1-10] chain. The Cu and Si atoms lie on special positions with 2/m site symmetry. In the crystal, intrachain N—H⋯F hydrogen bonds occur and weak C—H⋯F interactions link the chains.

Synthesis and structural characterization of Mn(II) and Cu(II) complexes with bis(4-(1H-imidazol-1-yl)phenyl)methanone ligands

Abstract Two complexes, {Mn(hfac)2(BIPMO)}n (1), {Cu(hfac)2(BIPMO)}n (2) [hfac=1,1,1,5,5,5-hexafluoro-pentane-2,4-dionato(–), BIPMO=bis(4-(1H-imidazol-1-yl)phenyl)methanone], with the V-shaped ligands were synthesized and characterized by infrared spectroscopy, elemental analyses, along with single-crystal X-ray diffraction analyses. The X-ray diffraction studies have shown that the metal ions in 1 and 2 are both six-coordinated to two nitrogen atoms of two BIPMO ligands and four oxygen atoms of two hfac ligands to form a distorted octahedral geometry. Each BIPMO ligand acts as a bridging ligand to link two adjacent metal(II) atoms to form a helical chain in the crystal structure.

catena-Poly[[dichloridoiron(II)]-μ-4,4′′-bis­(benzimidazol-1-yl)-1,1′:4′,1′′-terphen­yl]

In the title coordination polymer, [FeCl2(C32H22N4)]n, the FeII atom lies on a crystallographic twofold axis and a distorted FeCl2N2 tetrahedral coordination geometry arises. The complete ligand is generated by crystallographic twofold symmetry, resulting in an infinite one-dimensional architecture along [101].

catena-Poly[[dichloridocobalt(II)]-μ-4,4'-bis-(benzimidazol-1-yl)biphen-yl].

In the title compound, [CoCl2(C26H18N4)]n, the CoII atom (site symmetry 2) is tetrahedrally coordinated by two chloride ions and two N atoms from 4,4′-bis(benzimidazol-1-yl)biphenyl ligands: the complete ligand is generated by crystallographic twofold symmetry. The dihedral angle between the benzene rings is 34.67 (8)° and the angle between the benene ring and the adjacent benzimidazole ring system is 43.26 (10)°. The bridging ligand links the CoII atoms into chains propagating in [01].

1,1′‐(p‐Phenylene)bis(1H‐imidazol‐3‐ium) hexafluoridosilicate(IV)

In the title compound, C12H12N42+·SiF62−, both the dication and the dianion are centrosymmetric. The dihedral angle between the 1H-imidazol-3-ium ring and the benzene ring is 27.80 (11)°. An N—H⋯F hydrogen bond helps to establish the packing.