3,5-二氯-DEPAP分光光度法测定铁

本文研究了2-[(3,5-diCl-2-吡啶)偶氮]-5-二乙氨苯酚(简称3,5-diCl-DEPAP)在非离子表面活性剂 OP 存在下,与铁(Ⅱ)显色反应的适宜条件,确定了配合物的组成.实验表明:在 pH=4～7范围内铁(Ⅱ)与3,5-diCl-DEPAP 形成1:2的紫红色配合物,试剂的最大吸收峰位于450nm 处,配合物的最大吸收峰位于570nm 处.ε=6.7×10~41·mol~(-1)·cm~(-1),遵守比耳定律的范围为0～10μg/25mL.     

2-[2-苯并噻唑偶氮]-5-二甲氨基苯甲酸分光光度法测定微量钴

研究了显色剂2-[2-笨并噻唑偶氮]-5-二甲氨基苯甲酸(BTAMB)与钴的显色反应,发现在pH3.5～5.0的缓冲介质中,钴与BTAMB形成稳定蓝绿色配合物。其最大吸收波长位于690nm,组成比为1:2(Co:BTAMB),表观摩尔吸光系数ε_(690)=1.03×10~5L·mol~(-1)·cm~(-1),钴浓度在0～14μg/25mL范围内遵守比耳定律。此方法可用于维生素B_(12)针剂、含钴分子筛中微量钴的测定。     

1-(6-硝基-2-苯并噻唑)-3-(4-硝基苯)-三氮烯与钴的显色反应

在Triton X-100表面活性剂存在下,研究了1-(6-硝基-2-苯并噻唑)-3-(4-硝基苯)-三氮烯(NBTNPT)与钴的显色反应.在pH 10.0～11.5的Na2B4O7-NaOH缓冲溶液中,NBTNPT与钴生成N(NBTNPT):N(Co2 )=2 : 1的配合物,其最大负吸收峰在波长535 nm处,表观摩尔吸光系数为1.33×105L·mol-1·cm-1,ρ(Co2 )为0～360μg/L时符合比耳定律.用该方法测定维生素B12注射剂中的微量钴,测定结果满意.     

钴(Ⅱ)-5-(4-磺基-1-萘偶氮)-8-羟基喹啉-OP 显色体系的分光光度法研究及应用

本文研究了5-(4-磺基-1-荼偶氮)-8-羟基喹啉在表面活性剂 OP 存在下与钴(Ⅱ)的显色反应的条件。试验结果表明,在 pH5. 6～6. 6的 KH_2PO_4-NaOH 缓冲溶液和 OP 存在下,钴(Ⅱ)与该试剂能形成稳定的红色配合物。其λ_(max)=510nm,ε_(510) =6. 69×10~4L·mol~(-1) ·cm~(-1) ,钴(Ⅱ)∶试剂=1∶3,钴(Ⅱ)含量在0～0. 7μg/ml 范围内符合比尔定律。本文所拟定的分析方法用于维生素 B_(12) 中微量钴的测定,获得满意结果。     

测定微量铋的分光光度法研究

研究了在KI及非离子表面活性剂存在下用罗丹明B(Rhm B)在水相测定微量铋的高灵敏度方法。配合物的最大吸收(λ_(max))在605nm处,表观摩尔吸光系数ε_(605)=2.88×10~51·mol~(-1)·cm~(-1),在0～10μg Bi~(3 )/25ml范围内符合比耳定律,配合物的组成比Bi~(3 ):I~-:Rhm B=1:5:2,大多数常见离子均不干扰。方法的应用范围较广。用于Bi-Sr-Ca-O超导薄膜中的铋的测定,结果较为满意。     

3.5-diCl-DMPAP与镉显色反应的研究

研究了2-[3,5-二氯-2-吡啶)偶氮]-5-二甲氨基酚,在不同表面活性剂和混合表面活性剂的存在下,与镉离子的显色反应。实验结果表明,在非离子表面活性剂Tritonx-100存在下,3.5-diCl-DMPAP与镉在pH7.4～10范围内,形成1:2的红紫色配合物,试剂的最大吸收波长为447.4nm,配合物的最大吸收波长为567.4nm,ε_(567.4)=1.15×10~5。比耳定律适用范固为0～12μg/25mL,该方法用于含镉废水中微量镉的测定,获得满意结果。     

含双PNP和O-烷基二硫代磷酸配体的双核镍配合物的合成及其电化学性能

合成了4种含亚烷基双(二(二苯基膦基)胺(即双PNP)和O-烷基二硫代磷酸的双核镍配合物((CH_2)_n(N(PPh_2)_2)_2) Ni(S_2P{O}OR)_2(1:n=4,R=CH_3;2:n=4,R=C_2H_5;3:n=3,R=CH_3;4:n=3,R=C_2H_5),用红外光谱、核磁共振谱和紫外-可见吸收光谱对配合物的结构进行了表征。用X-射线单晶衍射测定了配合物1的单晶结构,配合物1含有两个畸变平面四边形Ni S_2P_2。用循环伏安法测定了配合物1～配合物4在乙腈中的电化学性能及其在三氟乙酸(TFA)中的电催化性能,电化学测定表明配合物1～配合物4均具有电催化还原TFA制氢的能力。1 mmol·L~(-1)配合物1～配合物4在添加120 mmol·L~(-1)三氟乙酸的乙腈溶液时的电催化制氢的转换频率(TOF)和过电位(η)分别为(442.5～469.5) s~(-1)和(0.89～0.98) V。     

2-羟基-4-磺酰氨基苯重氮氨基偶氮苯的合成及与钴的显色反应

研究了2-羟基-4-磺酰氨基苯重氮氨基偶氮苯(HSDAA)的合成及与钴的显色反应.在Triton X-100表面活性剂存在下,pH=9.0～11.0的Na2B4O7-NaOH缓冲溶液中,试剂HSDAA与钴(Ⅱ)生成2:1型深红色配合物,配合物的最大吸收峰位于λ=540 nm处,表观摩尔吸光系数为8.69×104L·mol-1·cm-1,ρ(Co2 )为0～480 μg/L时符合比耳定律.用拟定方法测定维生素B12中的微量钴,结果满意.     

基于邻菲哕啉衍生物构筑的钴(Ⅱ)配合物[Co(L)_2(HL)]·4H_2O的合成和晶体结构

通过水热方法合成得到了一种新的钴(Ⅱ)配合物[Co(L)_2(HL)]·4H_2O (1)(HL=2-(2-氯-6-氟苯基)-1H-咪唑[4,5-f][1,10]邻菲罗啉),并对该配合物进行了元素分析和单晶X射线表征.该配合物属于三斜晶系,空间群 P_1-,晶胞参数 a=1.103 8(2) nm,b=1.537 4(3) nm,c=1.593 3(3) nm,α=103.35(3)°,β=93.28 (5)°,y=109.75 (3)°,V=2.448 8(10) nm_3,Z=2,C_(57)H_(36)CoN_(12)O_4F_3Cl_3,M_r=1 175.26,D_c=1.594 g/cm~3,F(000)=1198,μ(Mo K_α)=0.591 mm~(-1),R=0.097 5 和wR=0.264 0.配合物(1)分子通过π-π堆积作用形成了一个二聚体{ [Co(L)_2(HL)]·4H_2O}_2.相邻的二聚体通过氢键相互作用形成了一个二维超分子层.     

量热法测定氯化铕甘氨酸配合物及其配离子的标准生成焓

应用具有恒温环境的反应量热计,在298.15 K的温度下,分别测定了[EuCl_3·6H_2O(s)+3Gly(s)]和配合物Eu(Gly)_3Cl_3·3H_2O(s)在2 mol·L~(-1)HCl溶液中的溶解焓.根据盖斯定律设计一个热化学循环,可计算得到三水氯化铕和甘氨酸配位反应的反应焓△_rH_m~θ(298.15 K)=-55.598 kJ·mol~(-1),并计算出配合物Eu(Gly)_3Cl_3·3H_2O(s)在298.15 K时的标准生成焓△_fH_m~θ(298.15 K)=一3 598.02 kJ·mol~(-1).同时测定了Eu(Gly)_3Cl_3·3H_2O(s)在水中的溶解焓△_sH_m=9.375 kJ·mol~(-1),并计算出配离子Eu(Gly)_3~3(aq)在298.15 K时的标准生成焓△_f H_m~θ[Eu(Gly)_3~(3+),aq,298.15 K]=一2 229.68 kJ·mol~(-1).     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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