A reversible dual-channel chemosensor for fluoride anion

A colorimetric and fluorescent fluoride probe bearing phenolic hydroxy and imine groups has been designed and synthesised. This receptor could visually and spectroscopically recognise F^?  with high selectivity over other anions. After the addition of fluoride ions to the solution of ([1,1′-biphenyl]-4,4′-diylbis (azanylylidene)) bis (methanylylidene)) bis (naphthalen-2-ol) (TY), since the deprotonation reaction occurred between the sensor and fluoride, the fluorescence intensity of the solution changed significantly. Furthermore, the quenched fluorescence caused by fluoride ions could be recovered upon the addition of calcium ions to this complex solution. This resulted in an ‘OFF-ON-OFF’ type sensing. In particular, an IMP logic gate has been proposed using the output obtained from the fluorescence studies. The fluorescence, UV-vis titration and ¹H NMR titration experiments indicated that the effects might occur via a combined process including hydrogen bond and deprotonation between the sensor and F^? .     

Separation of aromatic amines by an open‐tubular capillary electrochromatography method

A new and simple open‐tubular CEC (OT‐CEC) method with a novel diblock copolymer poly(butyl methacrylate)₇₁‐block‐poly(glycidyl methacrylate)₉ as the coating based on its self‐assembled properties has been developed. Compared with the bare capillary, this coating could act as a surfactant and improve the separation efficiency of aromatic amines. Meanwhile, the effects of pH value, buffer concentration, and the copolymer block ratio on the separation efficiencies were investigated in detail. It has been found that the three tested aromatic amines could be baseline separated by the OT‐CEC method with the cooperation of SDS. The proposed OT‐CEC method showed good repeatability with RSDs <3.2% for testing the EOF. Moreover, it was also well validated by satisfactory linearity and favorable recovery, which ensured its successful application in the separation of aromatic amines in nail polish samples. The results revealed the potential applicability of the OT‐CEC method in cosmetic analysis.     

五个天然异戊烯基黄酮的首次全合成研究

完成了具有2,3-二羟基-3-甲基丁基黄酮化合物brosimacutin A-B,brosimacutin D,brosimacutin E,brosimacutin H和brosimacutin M五个黄酮类化合物的消旋体的合成.所有新化合物的结构都经过NMR,HRMS确认.     

Designing Silicates as Deep‐UV Nonlinear Optical (NLO) Materials using Edge‐Sharing Tetrahedra

Discovering new deep‐ultraviolet (DUV) nonlinear optical (NLO) materials is currently a great challenge. The reported DUV NLO materials are almost exclusively borates or phosphates. Silicates—the largest constituent of the earth's crust—are excluded owing to their weak second harmonic generation (SHG) response. We report a silicate, Li₂BaSiO₄, with edge‐sharing LiO₄–SiO₄ tetrahedra that achieves the balance between a short UV absorption edge, below 190 nm, and a large SHG response, 2.8×KDP. The SHG intensity is the largest for silicates without second‐order Jahn–Teller cations, and exceeds that of non‐isomorphic Li₂SrSiO₄ by more than an order of magnitude. As such Li₂BaSiO₄ may be seen as a promising DUV‐UV NLO material. This research indicates that edge‐sharing tetrahedra is a new design parameter for discovering new DUV NLO materials.     

Molecular Aggregation of Naphthalene Diimide(NDI) Derivatives in Electron Transport Layers of Inverted Perovskite Solar Cells and Their Influence on the Device Performance

One of key factors to design applicable electron transport layers (ETLs) for perovskite solar cells is the morphology of ETLs since a good morphology would help to facilitate the carrier transport at two interfaces (perovskite\ETL and ETL\cathode). However, one drawback of most organic ETL small molecules is the internal undesired accumulation, which would cause the formation of inappropriate morphology and rough ETL surface. Here, by elaborately designing the side chains of NDI derivatives, the molecular interaction could be modified to achieve the aggregation in different degrees, which would eventually affect the accumulation of molecules and surface qualities of ETLs. By speculating from the comparison between the absorption spectra of solutions and films, the sequence of extent of molecule interaction and aggregation was built among three NDI derivatives, which is further confirmed by direct evidence of atomic force microscopy (AFM) images. Then, carrier exaction abilities are simply studied by steady‐state photoluminescence spectroscopy. The carrier transport process is also discussed based on cyclic voltammetry, time‐resolved photoluminescence spectroscopy and mobility. NDIF1 are proven to have the appropriate internal aggregation to smooth the contact with cathode and low series resistance, and a device performance of 15.6 % is achieved. With the ability of preventing the thermal diffusion of Ag towards the perovskite surface due to the strong interaction between molecules, NDIF2 at high concentration shows the highest fill factor (80 %).     

Cu-OMS-2-catalyzed decarboxylation–acetoxylation of (3R,4R)-4-acid-3-[(R)-1-((t-butyl-dimethylsilyl)oxy)-ethyl]-1-methoxyphenyl-2-azetidinone with NaBrO3/NaOAc

(3R,4R)-4-Acetoxy-3-[(R)-1((t-butyldimethylsilyl)oxy)-ethyl]-1-methoxyphenyl-2-azetidinone (an important precursor for the synthesis of carbapenem antibiotics) was synthesized under mild and green conditions catalyzed by Cu-OMS-2. Normal to excellent isolated yields were obtained under given conditions.     

ADSORPTION BEHAVIOUR OF Mn（II） AND Zn（II） ON ATTAPULGITE WITH FAAS METHOD

Active attapulbgite as adsorptive reagent, the adsorptive behavior of Mn（II） and Zn（II） was studied with Flame atomic absorption spectroscopy （FAAS） method. The mainly factors of influencing the adsorption and desorption of Mn（II） and Zn（II） were discussed. The interference of coexisting ions was investigated, and the actual sample determination from adzuki beans, mung beans and phosphating waste water was conducted with good result.     

Platinum Metallacycle-Based Molecular Recognition: Establishment and Application in Spontaneous Formation of a [2]Rotaxane with Light-Harvesting Property

Macrocyclic molecule-based host–guest systems, which provide contributions for the design and construction of functional supramolecular structures, have gained increasing attention in recent years. In particular, platinum(II) metallacycle-based host–guest systems provide opportunities for chemical scientists to prepare novel materials with various functions and structures due to the well-defined shapes and cavity sizes of platinum(II) metallacycles. However, the research on platinum(II) metallacycle-based host–guest systems has been given little attention. In this article, we demonstrate the host–guest complexation between a platinum(II) metallacycle and a polycyclic aromatic hydrocarbon molecule, naphthalene. Taking advantage of metallacycle-based host–guest interactions and the dynamic property of reversible Pt coordination bonds, a [2]rotaxane is efficiently prepared by employing a template-directed clipping procedure. The [2]rotaxane is further applied to the fabrication of an efficient light-harvesting system with multi-step energy transfer process. This work comprises an important supplement to macrocycle-based host–guest systems and demonstrates a strategy for efficient production of well-defined mechanically interlocked molecules with practical values.     

Synthesis of high-density nanocavities inside TiO2-B nanoribbons and their enhanced electrochemical lithium storage properties

Single crystalline TiO2-B nanoribbons with high-density nanocavities were successfully synthesized via a simple hydrothermal route. The as-prepared TiO2-B nanoribbons exhibited a large Brunauer, Emmett, and Teller (BET) surface area of about 305 m(2)/g because of the high-density nanocavities inside the thin nanoribbons. Electrochemical measurements indicated that the TiO2-B nanoribbons with dense nanocavities showed discharge specific capacity higher than those of TiO2-B nanotubes and nanowires. It was found that the dense nanocavities have an important influence on the electrochemical lithium intercalation properties.     

子宫内膜异位症中miR-143、miR-145和miR-126的差异表达

目的探索子宫内膜异位症（EMs）中miR-143、miR-145和miR-126的差异表达,以及不同月经周期的影响。方法利用realtimeRT-PCR技术,比较miR-143、miR-145和miR-126在EMs患者在位内膜（EU,2例）、异位内膜（EC,14例）、配对EU+EC（14例）,与非EMs患者内膜（EN,28例）中的表达差异;并分析EN和EC组不同月经周期对miR-143、miR-145和miR-126表达的影响。结果不同月经周期的影响分析,发现仅EN标本中miR-143增生期表达量高于分泌期,差异有统计学意义（P＜0.05）。与EN相比,miR-143和miR-145在EU中均表达上调（P＜0.05）,miR-143、miR-145和miR-126在EC中均表达上调（P＜0.01）。配对EU-EC中,miR-143、miR-145和miR-126在EC中均表达上调（P＜0.01）。结论miR-143、miR-145和miR-126在EMs中表达高于非EMs,在EC中表达高于EU。