Facile Synthesis of Nitrogen Tetradentate Ligands and Their Applications in CuI‐Catalyzed N‐Arylation and Azide–Alkyne Cycloaddition

Five new tetradentate ligands [NNNN] with benzimidazolyl‐imine or amine nitrogen donors have been synthesized in good yields under mild conditions from easily available substrates. trans‐N,N′‐bis(1‐Ethyl‐2‐benzimidazolylmethylene)cyclohexane‐1,2‐diimine is the best accelerating ligand in this series that supports the Cu^I‐catalyzed Ullmann N‐arylation and the direct three‐component azide–alkyne cycloaddition reaction to give the corresponding substituted imidazole, pyrazole, and triazole in high yields. Single‐crystal X‐ray diffraction analysis of its complex with CuI reveals a novel one‐dimensional coordination polymer of the metal chain bridged alternately by the [NNNN] ligand and diiodides.     

UF-两段厌氧处理茶多酚废水的研究

采用前置超滤膜(UF)的两相厌氧工艺对原水COD为18362.6mg/L,荼多酚为3608.3mg/L、色度为2624.2倍的茶多酚生产废水进行为期90d的实验研究.结果表明,当实验压力为0.2Mpa时,膜组件对COD去除率为63.4%,茶多酚去除率为95.1%,色度去除率为93.4%.然后,对两相厌氧工艺的投配率、P含量和酸化段水力停留时间(HRT1)对废水COD、色度与茶多酚去除率和产气率的影响进行了研究.当投配率为15.0%、P含量为38.1mg/L、HRT1=24h,该工艺达到最佳处理效果,出水COD为1288.1mg/L,COD去除率为80.8%,色度为95.6倍,色度去除率为44.6%,残余茶多酚为119.8mg/L,茶多酚去除率为32.3%,产气率为0.85m3/kg COD,与未采用UF预处理的两相厌氧水解工艺相比,COD、色度和荼多酚去除率分别提高23.40%,10.2%和1613%,产气率增加0.15m3/kg COD.     

Rapid and sensitive analysis of three polyphenols in tobacco by CE using homemade C(4) D with a mini detection cell

A rapid, sensitive, and practical CE with C(4) D detection was developed for the analysis of three polyphenols (rutin, scopoletin, and chlorogenic acid) in tobacco samples. The constructed mini detection cell (12 mm × 10 mm × 10 mm) of C(4) D featured with small inner cell volume (～2 nL), smaller noise (<0.9 mV), repeatability, high strength and durableness. Three polyphenols were ultrasonically extracted with methanol-water (70:30, v/v) solution following SPE cleanup. The CE method was optimized with the running buffer of 150 mmol L(-1) 2-amino-2-methyl-1-propanol (pH 11.2), and the applied separation voltage of +20 kV over a capillary of 50 μm id × 375 μm od × 50 cm (38 cm to the C(4) D window, 41.5 cm to the UV detector window), which gave a baseline separation of three polyphenols within ca. 6 min. The method provided the limits of quantification (S/N = 10) at about 0.08-0.15 μg g(-1) for three polyphenols, whereas the overall recoveries ranged from 82% to 88%. The proposed method has been successfully applied to measure three polyphenols in the actual tobacco samples, and their contents were calculated and evaluated.     

A general method for palladium-catalyzed direct carbonylation of indole with alcohol and phenol

A novel strategy involving a first oxidative iodination and subsequent Pd(0)-catalyzed carbonylation to yield indole-3-carboxylate has been developed. It showed perfect generality to indole, alcohol, and phenol. The current methodology could also be conveniently applied to the synthesis of biologically active tropisetron from simple indole and tropine.     

从FeSe0.5Te0.5的V～I曲线论磁通动力学的诸模型（英文）

高温超导体的发现动摇了支配磁通动力学二十几年的Kim-Anderson模型.于是人们提出了新的涡旋玻璃态模型,集体钉扎模型和U～j对数关系模型来描述高温超导体的磁通动力学.其中,涡旋玻璃态模型已被人们广泛接受.Fe基超导体发现后,人们它行为十分类似于高温超导体.我们实验上仔细研究了FeSe0.5Te0.5单晶的V～I关系曲线,发现上述诸模型均不能很好的解释我们的实验结果,而张的反跳模型恰能很好的拟合实验结果.本文讨论了诸模型对高温超导体磁通动力学描述的适用性并给出合理的解释.     

Cooling of Akmal-Pandharipande-Ravenhall neutron stars with a rotochemical heating source

Employing phenomenological density-dependent critical temperatures of strong singlet-state proton pairing and of moderate triplet-state neutron pairing, we investigate the effects of rotochemical heating on the thermal evolution of superfluid neutron stars whose cores consist of npe matter with the Akmal-Pandharipande-Ravenhall equation of state. Since the star is not quite in the weak interaction equilibrium state during spin-down, the departure from the chemical equilibrium leads to the rotochemical heating in a rotating NS which will increase the stellar＇s temperature. Our calculations show that the rotochemical heating delays the cooling of superfluid neutron stars considerably and makes the previous classification of NS cooling ambiguous. What＇s more, our model is currently consistent with all the observational data, and in particular some middle-aged and cold NSs （PRS J0205＋6449 in 3C 58, PRS J1357-6429, RX J007.0＋7303 in CTA 1, Vela） can be better explained when taking into account rotochemical heating.     

Cooling of Akmal-Pandharipande-Ravenhall neutron stars with a rotochemical heating source

Employing phenomenological density-dependent critical temperatures of strong singlet-state proton pairing and of moderate triplet-state neutron pairing, we investigate the effects of rotochemical heating on the thermal evolution of superfluid neutron stars whose cores consist of npe matter with the Akmal-Pandharipande-Ravenhall equation of state. Since the star is not quite in the weak interaction equilibrium state during spin-down, the departure from the chemical equilibrium leads to the rotochemical heating in a rotating NS which will increase the stellar's temperature. Our calculations show that the rotochemical heating delays the cooling of superfluid neutron stars considerably and makes the previous classification of NS cooling ambiguous. What's more, our model is currently consistent with all the observational data, and in particular some middle-aged and cold NSs (PRS J0205+6449 in 3C 58, PRS J1357-6429, RX J007.0+7303 in CTA 1, Vela) can be better explained when taking into account rotochemical heating.     

Detection of L‐phenylalanine using molecularly imprinted solid‐phase extraction and flow injection electrochemiluminescence

A novel flow injection electrochemiluminescence method combined with molecularly imprinted solid‐phase extraction was developed for the determination of L ‐phenylalanine, in which was used as the luminophor and indium tin oxide glass was modified as the working electrode. Molecularly imprinted polymers, synthesized by self‐assembly with functional monomer and crossing linker, were used for the selective extraction of L ‐phenylalanine. In order to overcome the drawbacks of traditional electrochemiluminescence cells such as high IR drop, high over‐potential and so on, a novel electrochemiluminescence cell was developed. The enhanced electrochemiluminescence intensity was linearly related with the concentration of L ‐phenylalanine in the range from 1.0×10^?7 to 5.0×10^?5 g/mL with a detection limit of 2.59×10^?8 g/mL. The relative standard deviation for the determination of 1.0×10^?6 g/mL L ‐phenylalanine was 1.2% (n=11). The method showed higher sensitivity and good repeatability, and was successfully applied for the determination of L ‐phenylalanine in egg white, chicken and serum samples. A possible mechanism for the enhanced electrochemiluminescence response on indium tin oxide glass is proposed.     

A Pd(OAc)2/[mmim]I Catalyst System for Oxidative Carbonylation of Amines to Carbamates, Ureas, and 2-Oxazolidinones

A Pd(OAc)₂/[mmim]I ([mmim]I=1-methyl-3-methylimidazolium iodide) catalyst system was applied to the oxidative carbonylation of aliphatic amines, aromatic amines, and amino alcohols to carbamates, ureas, and 2-oxazolidinones under different conditions. The catalytic turnover frequencies (TOF, moles of amines converted per mole of catalyst per hour) were 12417, 17368, and 4114 h⁻¹ for the production of methyl N-phenyl carbamate, N,N′-diphenyl urea, and 2-benzoxazolinone, respectively.     

CO2激光外差探测系统灵敏度的研究

本文通过讨论探测器的信噪比和噪声等效功率的影响因素,研究了CO_2激光外差探测系统的灵敏度.