The title compound, [NaLaMo8O26(C3H7NO)7]n, contains infinite chains of [Mo8O26]4− units supporting dimethylformamide‐coordinated LaIII cations and linked by Na+ cations. The lanthanum center adopts a nine‐coordinate geometry and the Na atom is sandwiched between two β‐[Mo8O26]4− units. 相似文献
Double the fun! Singlet–triplet dual emission at ambient temperature has been achieved in compounds containing a triarylboron acceptor and an N‐(2′‐pyridyl)‐7‐azaindolyl donor group bridged by a tetrahedral Si linker (see figure). PtII chelation and chelate‐mode switching from N,N to N,C have been found to greatly enhance phosphorescent emission. Furthermore, both singlet and triplet emission bands are responsive to fluoride ions.
Poly(trimethylene terephthalate)(PTT) is an excellent fiber material.Its thermal degradation and isothermal crystalline behaviors were in this study investigated using thermogravimetric analysis(TGA),thermogravimetric analysis-Fourier transform infrared spectroscopy(TGA-FTIR) analysis,differential scanning calorimetry(DSC) and X-ray diffraction(XRD).The thermal degradation mechanism of PTT follows Mclafferty rearrangement principle.The PTTwithintrinsicviscosity(Ⅳ) of 0.74 dL/g has a maximum crystallinity... 相似文献
An immunosensor has been fabricated for direct amperometric determination of carcinoembryonic antigen. It is based on a biocompatible composite film composed of porous chitosan (pChit) and gold nanoparticles (GNPs). Firstly, a pChit film was formed on a glassy carbon electrode by means of electrodeposition. Then, thionine as a redox probe was immobilized on the pChit film modified electrode using glutaraldehyde as a cross-linker. Finally, GNPs were adsorbed on the electrode surface to assemble carcinoembryonic antibody (anti-CEA). The surface morphology of the pChit films was studied by means of a scanning electron microscope. The immunosensor was further characterized by cyclic voltammetry and electrochemical impedance spectroscopy. The electrochemical behaviors and factors influencing the performance of the resulting immunosensors were studied in detail. Results showed that the pChit films can enhance the surface coverage of antibodies and improve the sensitivity of the immunosensor. Under optimal conditions, the immunosensor was highly sensitive to CEA with a detection limit of 0.08 ng·mL?1 at three times the background noise and linear ranges of 0.2~10.0 ng·mL?1 and 10.0~160 ng·mL?1. Moreover, the immunosensor exhibited high selectivity, good reproducibility and stability. 相似文献
We report the sonophysically‐exfoliated methods access to the preparation of homogeneous‐free multi‐walled carbon nanotubes (MWCNTs) in water solution. Highly stable, uniform, individual MWCNTs are entirely performed through sodium dodecylsulfate surfactants by means of a tip sinicator. HRTEM images show that the crystalline finger walls of individual CNTs are apparently observed. Raman spectrum of MWCNTs shows that the so‐called G'‐band, associated with metallic electronic structure, was significantly observed at 2644 cm?1 with full‐width at half‐maximum of 262 cm?1, indicating that the sonication physical methods do not alter their electric properties. Owing to its easy‐to‐use procedure and low cost of implementation, this approach could lead to the commercial viability of the large‐scale MWCNTs processing. 相似文献
One new hydrolyzable tannin, 1‐O‐[(E)‐p‐coumaroyl]‐3‐O‐galloyl‐β‐D ‐glucopyranose ( 1 ), was isolated from the rhizome of Balanophora harlandii, together with 18 known phenolic compounds. Their structures were determined by detailed spectroscopic analysis. Of the known compounds, 3‐O‐caffeoyl‐D ‐glucopyranose ( 6 ) was obtained as a natural product for the first time, and compounds 2 – 6 and 8 – 19 were identified for the first time from this plant. The radical‐scavenging activity of the isolated compounds was tested by a DPPH assay. 相似文献
The polynuclear copper(II) complex [Cu2(Hdpa)2(μ‐ClDHBQ)(ClO4)2]n, 1 is bridged by ClDHBQ?2 (2,5‐dichloro‐3,6‐dihydroxy‐1,4‐benzoquinone dianionic) and 2,2′‐dipyridylamine (Hdpa). In the axial position, Cu is connected with the oxygen atom of ClO. The perchlorate anion may be envisaged as a monodentate O‐bound ligand. Through the bond bridge of O–Cu … O–Cl, the binuclear compound [Cu2(Hdpa)2(μ‐ClDHBQ)(ClO4)2] is strung together into a long chain compound. Tetrachlorocatechol underwent partial oxidation/hydrolysis/dechlorination processes to produce ClDHBQ?2. The other mononuclear complex [Cu(Hdpa)(TeCQ)](DMF), 2 , in which tetrachloroquinone (TeCQ) was produced by oxidation of tetrachlorocatechol (TeCC), therefore complex 2 is in the quinone form. The magnetic susceptibility measurements show antiferromagnetic coupling with J = ?11.9 cm?1, θ = 2.6 K, and g = 2.05 for complex 1. Complex 2 exhibits the typical paramagnetic behavior of s = 1/2. 相似文献