Showing papers by "Tao Tao published in 2013"

Asymmetrical/symmetrical D-π-A/D-π-D thiazole-containing aromatic heterocyclic fluorescent compounds having the same triphenylamino chromophores.

Abstract: A family of linear asymmetrical D−π–A and symmetrical D−π–D types of thiazole-based aromatic heterocyclic fluorescent compounds bearing various electron-donating and electron-withdrawing tails (bromo, triphenylamino, pyridyl, thienyl and benzoic acid) have been designed and prepared successfully. Synthetic, structural, thermal, spectral and computational comparisons have been carried out for related compounds because of their adjustable electronic properties. It is interesting to mention that compound 2 can be prepared from 5-bromothiazole by one-pot Suzuki–Miyaura coupling and subsequent C–H activation reactions via a 5-TPA-substituted thiazole intermediate 1. X-ray single-crystal structures of six compounds indicate that they all crystallize in the triclinic P1 space group and the thiazole core exhibits different dihedral angles with its adjacent benzene ring of the triphenylamino group (3.6(3)–40.8(3)°). The photophysical and electrochemical results demonstrate that compound 7 exhibits high electroche...

C–C bond cleavage in acetonitrile by copper(II)–bipyridine complexes and in situ formation of cyano-bridged mixed-valent copper complexes

Abstract: Influencing factors, including organic reductant, counterion of copper(II)–bipyridine complex, reaction solvent, molar ratio of copper(II)–bipyridine complex and organic reductant, reaction time and chelating ligand of copper complex, have been extensively investigated on the reaction of copper(II)–bipyridine complex mediated C–C bond cleavage of acetonitrile. Furthermore, in situ formation of a series of cyano-bridged mixed-valent copper complexes has been described in this paper, where twelve new copper complexes with or without the presence of cyanide anions have been yielded and structurally characterized including two novel one-dimensional (1D) mixed-valent copper coordination polymers. In addition, a trinuclear cyano-bridged mixed-valent copper complex 9, which is believed to be the most stable species in this system, shows effective activity in catalyzing Ullmann C–N cross-coupling reactions.

Coplanar Bithiazole-Centered Heterocyclic Aromatic Fluorescent Compounds Having Different Donor/Acceptor Terminal Groups

Abstract: A family of stable and soluble bithiazole-centered heterocyclic aromatic fluorescent compounds is described herein. All these multiple N-donor containing compounds have effective π-conjugated systems and different imidazole, pyridine, thiophene, triphenylamino, benzoic acid, and ethyl benzoate tails showing distinguishable D–A–A–D and A–A–A–A structures. X-ray single-crystal structures of seven compounds indicate that all of the bithiazole cores have the same trans coplanar configuration but exhibit different dihedral angles with their adjacent aromatic heterocycles (4.5(6)–69.7(3)°). Optical and electrochemical results demonstrate that the TPA-terminated bithiazole compound 2TPA2TZ has yellow fluorescence and reversible redox activity as well as extraordinarily high thermal stability. Theoretical and experimental studies have been made to reveal the differences from related compounds with adjustable electronic properties. The internal reorganization energy (λ) studies have been carried out to indicate th...

Two pairs of 1 : 2 nickel(II) and copper(II) metal-complex dyes showing the same trans configuration and azo–hydrazone transformation but different thermal properties

Abstract: Two pairs of 1 : 2 neutral trans mononuclear transition-metal (M = NiII and CuII) complexes of pyridine-2,4-dione and quinoline-2,4-dione based heterocyclic dyes have been structurally and spectrally characterized and compared herein. X-ray single-crystal diffraction analyses of four complexes, namely trans-[Ni(La)2(DMF)2] (1), trans-[Cu(La)2(DMF)2] (2), trans-[Ni(Lb)2(DMF)2] (3) and trans-[Cu(Lb)2(DMF)2] (4), reveal that they have the same trans configuration between the bidentate chelating dianionic ligands and two axially coordinated DMF molecules. Furthermore, a transformation from the hydrazone to azo configuration has been observed for both bidentate chelating ligands La− and Lb− after metal-ion complexation. More importantly, the simultaneous DSC/TG-MS-FTIR method has been used to explore the thermal stability of four neutral metal-complex dyes 1–4, where the two axially coordinated DMF molecules in NiII and CuII complexes exhibit distinguishable decomposition behavior because of their different M–O bond lengths originating from the Jahn–Teller distortions.

Temperature-Dependent Current–Voltage and Photoresponsive Properties for Semiconducting Nanodevices Fabricated from an Oligothiazole Dithiol and Gold Nanoparticles

Abstract: A rigid oligothiazole dithiol molecule (3) is first introduced to fabricate the self-assembled granular thin films with gold nanoparticles (Au-NPs) covering 1 μm gap gold electrodes by means of the Au–S bonded contacts, where the nanocomposite thin films prepared from different concentrations of dithiol 3 and Au-NPs (1.0, 0.5, and 0.1 mmol/L) exhibit temperature-dependent semiconducting I–V behavior in the order of μA, nA, and pA and photoresponsive properties in the temperature range 8–300 K. Compared with the nanodevices fabricated from similar oligothiophene dithiols, it is interesting to mention that the oligothiazole dithiol based ones show analogous morphologies and temperature-dependent I–V characteristics but enhanced photoresponsvie properties, which may arise from the improved charge separation ability of oligothiazole in stabilizing the photogenerated electron carriers. To the best of our knowledge, this is the first report in which an oligothiazole dithiol molecule acts as a bridging unit to l...

Method for removing battery electrode sheet burr by corroding with dry method

Abstract: The invention relates to a method for removing a battery electrode sheet burr by corroding with a dry method, which is characterized in that an inductance coil is used for ionizing reaction gas, the ionized reaction particles enables bombardment on the battery electrode sheet burr under DC bias voltage, the burr on the edge of a battery electrode sheet workpiece can be eliminated under the effect of physical bombardment, thereby the edge burr brought by processing the workpiece can be eliminated. The used device is an inductively coupled plasma etching instrument (ICP for short). The method provided by the invention can completely remove the burr on the battery electrode sheet, thereby the generation of phenomenon that the battery electrode sheet stabs a diaphragm to cause the short circuit of the battery under the reeling process can be effectively avoided.

Method for removing burrs of battery electrode plates by inductively coupled plasma dry etching

Abstract: The present invention provides a method for removing burrs of battery electrode plates using inductively coupled plasma (ICP) dry etching, in which an induction coil is used for ionizing reaction gas. A DC bias is applied to accelerate the ionized reaction gas to bombard the burrs of electrode plate, removing burrs that formed in machining processes using physical bombardment. The equipment used in the present invention is an ICP etch system. The method according to the present invention can completely remove the burrs of electrode plate, thereby effectively preventing short circuits caused by burrs penetrating the membrane separator in the battery.