Enhancement of Photocurrent Generation of a Novel Stilbazolium Dye Dimer in LB Monolayer Films

A novel dye dimer,bis-{[1-(N-hexadecyl-4-pyridinium)-2-(4-N,N-dimethylaminopheyl)] ethenyl} methane diiodide (C16BP) was synthesized,and the photoelectrochemistry of the dye Langmuir-Blodgett monolayer modified ITO electrode was investigated.For comparison,the photoelectrochemistry of the monomer (E)-N-hexadexyl-4-[2-(4-N,N-dimethylaminophenyl) ethenyl] pyridinium iodide (C16P) was also measured.The results show that the photocurrent generation property of the dimer is enhanced.The photocurrent generation quantum yield is 0.38% for C16BP,while that for C16P is 0.23%.     

微波衍生-离子对高效液相-磺化四苯基卟啉光度法同时测定痕量镍、铜、锰和锌

 用磺化四苯基卟啉 (TPPS4 )作柱前衍生试剂 ,在微波作用下进行衍生反应 ,研究了衍生和分离Ni2 + ,Mn2 + ,Zn2 + 和Cu2 + 的最佳条件。在 75 0W的微波作用下衍生反应 3min ,在C18柱上采用乙腈 水 (体积比为 2 2 5∶77 5 )体系作流动相 ,四乙基溴化铵 (TEABr)作离子对试剂 ,在 415nm处检测 ,建立了微波衍生 离子对高效液相快速分离、光度检测Ni2 + ,Mn2 + ,Zn2 + 和Cu2 + 的新方法。络合物和反应试剂在 15min内出峰完毕。Zn2 + ,Cu2 + ,Ni2 + 和Mn2 + 的检测限分别为 0 0 5 μg/L ,0 0 1μg/L ,0 10 μg/L和 0 40 μg/L。     

Some Organic Reactions in Supercritical Carbon Dioxide

Organic reactions in supercritical carbon dioxide (scCO2) have facilitated great progress in recent years . ScCO2, as an environmentally friendly reaction medium, may be a substitute for 1 volatile and toxic organic solvents and show some special advantages. Firstly, CO2 is inexpensive, nonflammable, nontoxic and chemical inert under many conditions. Secondly, scCO2 possesses hybrid properties of both liquid and gas, to the advantage of some reactions involving gaseous reagents. Control o…     

Theoretical Study on the Isomerization Mechanism of Enol Ester from 2-Acyl-1, 3-cyclohexanediones

The present paper employed density function theory to investigate two reaction pathways for isomerization of enol ester proposed by Yang(path a) and the present authors(path a), respectively. The base catalytic effects of solvent triethylamine on these two reactions were also evaluated. It is demonstrated that path B is more preferable than path a due to low barrier height for the rate-determining step.     

(R)-1，1′-联萘手性单元通过溶胶凝胶法合成杂化硅干凝胶(英)

Precursor molecule (R)-6,6′-bis(triethoxysilylethen-2-yl)-2,2′-di(methoxyethoxymethyloxy)-1,1′-binaphthyl (R-2) was synthesized by Pd-catalyzed Heck reaction of (R)-6,6′-dibromo-2,2′-di(methoxyethoxymethyloxy)-1,1′-binaphthyl (R-1) intermediate with vinyltriethoxysilane. The hydrolysis and polycondensation of the precursor R-2 produced the corresponding xerogel. Both precursor and xerogel were analysed by NMR, FTIR, UV, CD spectra, fluorescent spectroscopy, polarimetry and elemental analysis. The precursor and xerogel can emit strong blue fluorescence and are expected to have a potential application in the separation of chiral molecules as fluorescent sensor. The precursor exhibits strong Cotton effect in its circular dichroism (CD) spectrum indicating a highly rigid structure.     

The Synthesis of Gracillin and Dioscin：TWO Typical Representatives of Spirostanol Glycosides

Two spirostanol saponins(gracillin and dioscin)which have the typical sugar moieties were synthesized facilely by a general approach.     

Preparation and Characterization of Microencapsulated Hexadecane Used for Thermal Energy Storage

Polyurea microcapsules about 2.5μm in diameter containing phase change material for thermal energy storage application were synthesized and characterized by interfacial polycondensation method with toluene-2,4-diisocyanate and ethylenediamine as monomers in an emulsion system. Hexadecane was used as a phase change material and OP, which is nonionic surfactant, and used as an emulsifier. The chemical structure and thermal behavior of the microcapsules were investigated by FTIR and thermal analysis respectively. The results show encapsulated hexadecane has a good potential as a solar energy storage material.     

联萘衍生物的磺化反应研究

研究了1-和2-苯基萘, 1, 1'-和2, 2'-联萘, 2, 2-二羟基-, 2, 2'-二甲氧基和-2, 2'-甲基磺酰氧基-1, 1'-联萘等七种萘衍生物和三氧化硫的磺化反应。1-苯基萘和1, 1'-联萘的磺化先发生在4位上, 第二取代位置为6和7位。2-苯基萘和2, 2'-联萘均首先得到8位磺酸取代物, 进一步磺化得到8, 4'-和8, 8'-二磺酸取代物。2, 2'-二甲氧基-1, 1'-联萘以13:87的比例得到3位和6位磺酸取代物。2, 2'-二甲磺酰氧基-1, 1'-联萘以58:42的比例得到5位和6位磺酸取代物。2, 2'-二羟基-1, 1'-联萘的等摩尔磺化得到比例为35:65的5位和6位磺酸取代物, 和大于6摩尔的SO~3反应则以62:38的比例得到5位和6位磺酸取代物。     

稀土红色荧光粉SrZnO2∶Eu3+的发光性能

A series of novel luminescent materials, SrZnO₂∶M (M=Eu³⁺, or Eu³⁺ + Li⁺) have been synthesized by high-temperature solid-state reaction. The structure and luminescence properties of SrZnO₂∶Eu³⁺ phosphor were studied through XRD, photoluminescence and Raman spectroscopy. The excitation spectra show a broad intense band and a number of small peaks corresponding to the inner 4f-shell excitations of Eu³⁺ (the strongest one is at 395 nm for ⁷F₀-⁵L₆). After SrZnO₂∶Eu³⁺ phosphor was co-doped with Li⁺ ions, its charge transfer band extended to longer wavelengths. This resulted in increase of luminescent quantum efficiency of the sample. SrZnO₂∶Eu³⁺,Li⁺ phosphor can be efficiently excited by longer UV. From the fluorescence spectrum of SrZnO₂∶Eu³⁺ phosphor, apart from transition emissions of ⁵D₀→ ⁷F_J (J=0～4), the transition emissions from ⁵D₁ → ⁷F_J (J=0～2) have been observed. For the SrZnO₂∶Eu³⁺ phosphor, under excitation of UV, the dominant emission is at about 612 nm, due to the ⁵D₀→ ⁷F₂ hypersensitive transition. The incorporation of Li⁺ ions greatly enhanced the luminescence intensity and made emission peak from ⁵D₀ → ⁷F₂ transition red-shifted.     

乙酰基硫代甲酰芳胺合成二氢吡嗪的研究

报道了一种合成乙酰基硫代甲酰芳胺的方法. 合成的乙酰基硫代甲酰芳胺与1,2-乙二胺缩合生成5-(4'-取代苯胺基)-6-甲基-2,3-二氢吡嗪类杂环化合物.