1-芳酰基-4-取代吡唑甲酰基氨基硫脲和环化产物的合成及生物活性

利用1-苯基-3-甲基-5-氯-4-吡唑甲酰基异硫氰酸酯(Ⅰ)与芳酰肼(Ⅱ)的加成反应合成了系列新的酰胺基硫脲衍生物(Ⅲ),并将Ⅲ在酸性条件下进行环化反应得到2-取代吡唑甲酰基氨基-5-芳基-1,3,4-噻二唑(Ⅳ).生物活性测定结果表明部分化合物Ⅲ和Ⅳ具有较好的除草活性.     

有机液体的慢极化介电谱

高绝缘液体存在一种特殊类型的极化响应; 其性质很不同于普通的介电极化响应。后者可用频域方法描述, 称为快响应;前者不能用频域而只能用时域方法描述, 故区别地称为慢响应。在微分时域介电谱中, 每种快或慢极化机构贡献一个峰。苯的时域谱有一个快峰和两个慢峰。室温下石蜡只有一个快峰和一个慢峰; 在加热熔解过程中慢峰分裂为两个峰。慢极化响应和液体中分子的局部束缚空间电荷有关; 慢极化介电谱可以给出分子动力的许多信息。     

RhCo双金属催化剂的研究III. Rh+Co/Al2O3上表面羰基氢化物及其动态行为

利用连续流动微反研究了Rh+Co/Al2O3催化剂的CO加氢反应, 结果表明反应在220℃以上发生, 反应活性随着温度的升高和H2/CO值的增加而增加。利用TP-IR动态方法研究了Rh+Co/Al2O3上CO和H2共吸附及其动态行为。结果表明在Rh+Co/Al2O3的孪生及线式中心上, CO和H2室温共吸附时即有部分孪生及线式CO转化为相应的羰基氢化物, 随着温度的升高, 剩余的孪生和线式CO继续向相应的羰基氢化物转化。而羰基氢化物则向多羰基氢化物转化。在到达反应温度之前, 催化剂表面只存在羰基氢化物及相应的多氢羰基氢化物。在反应温度则导致产物CH4生成。与CO加氢反应和CO歧化的吸附态研究结果相关联, 作者认为Rh+Co/Al2O3上CO加氢生成CH4是经由羰基氢化物-多氢羰基氢化物途径。     

取代二苯胺重氮盐、重氮树脂合成及光、热分解性质

二苯胺型重氮树脂是阴图PS版最重要的感光剂^[1],关于它的应用已有许多专利^{[2 5]}.作为一种预涂感光版,阴图PS版的贮存期要求在一年以上,从而对作为感光剂的重氮树脂的热稳定性有较高的要求,希望其热分解温度尽量高一些并能在潮热气候下性质稳定.一般来说,二苯胺重氮盐的苯环上带取代基时,有利这些性质的改善,如3-甲氧基二苯胺-4-重氮盐树脂就是一个例子,它已获得广泛的应用^[6,7].     

空间因素对敏化剂性质的影响

本文介绍了一种新的敏化剂cis-(NCS)₂-bis(2,2′-bipyridyl-3,3′-dicar-boxylate)ruthenium(Ⅱ)的合成,测定了它的吸收光谱及氧化还原电位,并将这种染料吸附到具有大比表面的TiO₂纳晶电极上测量它的光电转换效率。另外,参照文献分别合成出cis-(NCS)₂-bis(2,2′-bipyrdyl-4,4′-or 5,5′-dicarboxylate)Ru(Ⅱ)染料,测定它们的光电及光物理性质并以此为依据讨论了空间因素对敏化剂性质的影响。     

Suppressing Chaos and Transient in Parameter Perturbed Systems

The systems with some system parameters perturbed are investigated. These systems might exist in nature or be obtained by perturbation or truncation theory. Chaos might be suppressed or induced. Some of these dynamical systems exhibit extraordinary long transients, which makes the temporal structure seem sensitively dependent on initial conditions in finite observation time interval.     

铜-聚四氟乙烯复合电极的研制及应用

对铜-聚四氟乙烯复合电极的制作方法进行了研究,对其电分析性能做了考察,用XPS及SEM对电极表面形态进行了表征。实验证明,以5mA/cm²的电流密度镀0.5C所得的复合电极有优良的机械性能和分析性能,将其与裸铜电极相比,前者不仅加宽了电位窗,而且增大了对醇醛糖的恒电位安培法响应。将它做成流动注射分析检测池的柱状工作电极,则背景信号降低,使检出限进一步降低。可检出3×10^-6mol/L葡萄糖。本文还对它们的电氧化过程作了探讨。     

Electrochemical and Spectral Studies on Ferrocene Derivatives with Electron Pushing and Drawing Substituents

Three ferrocene derivatives, P Ⅰ: R-Fc-A, P Ⅱ:D-Fc-R and P Ⅲ: D-Fc-A(R:CH₂OH, A: CH＝C(CN)CONH₂, D:(C₁₈H₃₇)₂-C₆H₄-CH=CH), were studied by means of cyclic voltammetry and absorption spectroscopy. Compound P Ⅰ shows MLCT transition,P Ⅱ D shows strong LMCT and P Ⅲ shows both strong LMCT and π→π^* CT transitions. Based on these data, frontier orbital interactions of electron pushing and drawing substituents with ferrocene group were analyzed. It was found that a drawing substituent would lower the π^* orbital energy level and a pushing, substituent would raise the π orbital level.     

A Study of Spectroscopy on TCAQ Microcrystal

UV-visible absorption spectra of 11,11,12,12-tetracyano-9,10-anthraquinodimethane (TCAQ) solution, crystal and evaporated film were, measured. The absorption spectrum of TCAQ solution in DMF had three bands at 287 nm(4.45), 310 nm(4.23) and 350 nm(4.38) respectively; that of evaporated films had one band at 370 nm and that of crystalline powder had four bands at 243 nm, 275 nm, 320 nm and 430 nm respectively. Surface photovoltage spectra of TCAQ microcrystal gave two bands at P₁ (320 nm) and P₂ (430 nm) respectively. The absorption bands were assigned and the energy levels of frontier orbitals were tentatively determined. In addition,the mechanism of hole, production and transportation in crystalline TCAQ was discussed.     

A Novel Amphiphilic Push-pull Ferrocene Derivative: Langmuir-Blodgett Films and Second-order Optical Nonlinearity

We investigated Langmuir-Blodgett(LB) films built from the mixture of an amphiphilic push-pull ferrocene derivative(P) and behenic acid. Langmuir films of P diluted by behenic acid exhibit a very good cohesion, and the mixed films can easily be transferred onto solid substrates. Linear dichroism UV-visible and IR spectroscopy measurements of the mixed LB multilayers confirm that the molecules(P) are oriented to the substrate. The nonlinear optical experiments on the mixed monolayer deposited on the CaF₂ slide showed that P displays efficient optical second harmonic generation(SHG) with a molecular hyperpolarizability (β)h, high as 6.0×10^-29e. s. u..