An organoantimony nitrate complex with azastibocine framework as water tolerant Lewis acid catalyst for the synthesis of 1,2-disubstitued benzimidazoles

A novel organoantimony complex of 6-cyclohexyl-6,7-dihydrodibenzo[c,f] [1,5]azastibocin-12(5H)-yl nitrate ( 2 ) was synthesized and systematically characterized by techniques such as NMR spectra, TG-DSC, and X-ray diffraction. It was found that the complex 2 exhibits relatively strong Lewis acidity (3.3 < Ho ≤ 4.8) and could be employed as a water tolerant Lewis acid catalyst for the synthesis of synthetically valuable benzimidazole derivatives starting from aldehydes and arylenediamines. This catalytic system shows excellent tolerance toward a wide variety of functional groups, such as methyl, methoxyl, fluoro, chloro, bromo, nitro, cyan, trifluoromethyl, 1-naphthaldehyde, furfural and n-butyl, together with facile reusability in 5 times scale enlarged synthesis.     

Preparation and Optical Properties of Sb2S3 Microcrystallite Doped Silica Glasses by the Sol-Gel Process

The sol-gel process has been applied to the preparation of nano-size Sb2S3 crystallite doped silica glasses and thin films. Silica glasses containing 1–1.5 wt% Sb2S3 are prepared by hydrolysis of complex solution of Si(OC2H5)4, SbCl3 and SC(NH2)2, and subsequent heat treatment. The nano-size crystallite in the matrix is observed by means of TEM. The transmission spectra of the films show that the transmission valley shifts toward longer wavelengths with increasing heat treatment time and temperature. Second harmonic generation (SHG) has been observed in the glasses illuminated with intense 1.06 m and frequency-doubled laser beams from mode-locked Nd:YAG laser.     

端视ICP-AES法同时测定玩具涂料中可溶性铅、镉、汞、砷、铬、锑、硒和钡

采用端视电感耦合等离子体原子发射光谱(ICP-AES)法同时测定玩具涂料中可溶性铅、镉、汞、砷、铬、锑、硒和钡.对仪器的工作参数和被测元素的分析谱线进行了优化和选择.铅、镉、汞、砷、铬、锑、硒和钡的检出限分别为0.006、0.0009、0.012、0.023、0.000 8、0.013、0.030和0.0006 mg/L.定量下限分别为0.99、0.15、2.0、3.8、0.14、2.2、5.0和0.10 mg/kg.相对标准偏差为0.76%～2.72%(n=8),加标回收率为96.0%～104.0%.该法适用于玩具涂料中铅、镉、汞、砷、铬、锑、硒和钡的快速测定.     

帽状锑纳米粒子的制备及表面等离子共振特性的研究

采用热蒸发法在SiO₂自组装单层膜上制备了帽状锑纳米粒子,通过扫描电镜(SEM)、原子力显微镜(AFM)、X射线衍射仪(XRD)和紫外-可见-近红外(UV-Vis-NIR)分光光度计对帽状复合纳米粒子的表面形貌、结构以及表面等离子共振特性进行了研究和表征。结果表明,制备的复合纳米粒子呈帽状,表面等离子共振峰具有明显的可调谐性,当二氧化硅粒径增大或锑帽层厚度增加时,等离子共振吸收峰位置红移。     

Sb_2Te_3纳米片的水热合成与表征

在水热条件下,以乙醇胺为还原剂,实现了亚碲酸根(TeO~(2-)_3)的分步还原,并以新生成的单质Te纳米棒为碲源,原位一步法合成出六方相Sb_2Te_3纳米片.采用X射线粉末衍射仪(XRD)、场发射扫描电子显微镜(FESEM)和透射电子显微镜(TEM)等对产物的物相、形貌及组成进行了表征.结果表明,产物Sb_2Te_3为六方纳米片,厚度约为100~200 nm,直径约为0.6~1.5μm,形貌均一,分散性良好.适宜的合成条件是水/乙醇胺体积比为8∶12,180℃下反应24 h.依据部分实验结果以及单质Te和六方相Sb_2Te_3晶体结构的比较,证明了Sb_2Te_3主要以外延方式在单质Te纳米棒表面生长,且两者的晶面取向为(003)Te//(003)Sb_2Te_3,[110]Te//[110]Sb_2Te_3.     

Sb2S3纳米粒子修饰ZnO纳米片微纳分级结构的光电化学性能

采用恒电位方法,选择氯化钾和乙二胺(EDA)为添加剂,在氧化铟锡(ITO)导电玻璃上制备了高度有序的ZnO纳米片阵列,通过二次电沉积得到了ZnO纳米片上生长纳米棒的微纳分级结构.利用化学浴沉积法在ZnO基底上沉积Sb₂S₃纳米粒子制备出了Sb₂S₃/ZnO纳米片壳核结构和Sb₂S₃/ZnO微纳分级壳核结构.利用扫描电子显微镜(SEM)、X射线衍射(XRD)、紫外-可见(UV-Vis)吸收光谱、瞬态光电流等对其形貌、结构组成和光电化学性能进行了表征和分析.结果表明, Sb₂S₃/ZnO纳米片上生长纳米棒分级壳核结构的光电流明显高于Sb₂S₃/ZnO纳米片壳核结构.在Sb₂S₃/ZnO纳米片壳核结构和Sb₂S₃/ZnO微纳分级壳核结构的基础上旋涂一层P3HT薄膜形成P3HT/Sb₂S₃/ZnO复合结构,以上述复合结构薄膜为光活性层组装成杂化太阳电池,其中, P3HT/Sb₂S₃/ZnO分级壳核结构杂化太阳电池的能量转换效率最高,达到了0.81%.     

Dust acoustic wave in a dusty plasmas with streaming ions and nonadiabatic dust charge variation

The effects of nonadiabatic dust charge fluctuation on the nonlinear propagation of the dust acoustic (DA) solitary wave in collisionless dusty plasma with streaming ions have been investigated. By using the reductive perturbation technique, a modified Korteweg-de Vries (mKdV) equation governing the nonlinear waves was derived and the solitary solution of the mKdV equation was also obtained. It was shown that the damping rate of the slow mode DA solitary wave was strongly affected by the ion streaming velocity.     

Small amplitude variable charge dust Bernstein-Greene-Kruskal double layers

A first theoretical attempt is made to investigate small amplitude, variable charge dust Bernstein-Greene-Kruskal (BGK) double layers (DLs). The nature of the dust BGK-DLs (compressive or rarefactive), their strength and thickness depend sensitively on the net negative charge residing on the grain surface, the dust grain dynamics and, more interestingly, on the ion-to-electron temperatures ratio.     

氢化物发生-原子荧光光谱法测定铜精矿中的砷、锑和铋

建立了氢化物发生-原子荧光光谱法同时测定铜精矿中砷、锑、铋的方法,采用了主量元素匹配法来消除基体干扰,优化了反应体系的酸度、还原剂浓度等条件进行了优化。砷、锑、铋的浓度在1—200μg·L~(-1)范围内与荧光强度呈线性关系。方法回收率为92%—101%,相对标准偏差为2.7%—5.5%。     

金矿石中高含量锑的断续流动氢化物发生-原子荧光光谱法快速测定

采用王水（1＋1）水浴分解样品,氢化物发生-原子荧光光谱法（HG-AFS）测定金矿石中高含量的锑.其方法回收率在95.0%-102.0%之间,相对标准偏差在1.0%-3.4%之间,方法检出限为3.0×10-10g/mL,经试验证实该方法可测范围宽、简便、快速、准确,实验室间对比分析结果吻合程度令人满意.