ClInPc—（TPD—PVK）光电导体性能的研究

本文以氯化酞菁铟（ＣｌＩｎＰｃ）为载流子发生层（ＣＧＬ），四苯基联苯胺（ＴＰＤ）与聚乙烯咔唑（ＰＶＫ）复合为载流子传输层（ＣＴＬ），形成双层结构的功能分离型有机光电导体（Ｐ／Ｒ），研究了它的静电感光性能。结果表明，ＣｌＩｎＰｃ／ＰＭＭＡ（３０％）与ＴＰＤ／ＰＶＫ（１：１）两者匹配时的Ｐ／Ｒ具有良好的光电导性能，其电荷接受能力Ｖｍａｘ≈８００Ｖ，光电导率△Ｖｔ（ｌｓ）＞７０％，暗衰小（＜５０Ｖ／ｓ）     

具有光电导性能的聚合物的合成

本研究首先合成了带氨基的酞菁锰,并使之成为重氮盐,通过重氮偶合法首次合成了含酞菁锰乙烯基咔唑单体,使之分别与丙烯腈、４－乙烯基吡啶发生共聚,合成出酞菁锰单体接枝率不同的共聚物Ｉ、Ⅱ,经ＩＲ、ＵＶ／ｖｉｓ、原子吸收法表征确证了聚合物和单体的结构,聚合物Ｉ、Ⅱ均具有良好的溶解性、成膜性。把聚合物Ｉ、Ⅱ及酞菁锰作为光生材料与ＴＰＤ、ＴＰＡ、吡唑啉匹配后制成功能分离型的双层光电导体。讨论了它们的光电导性,     

单层结构ε－CuPc光导体的静电照相特性──ε－CuPc的浓度的影响

本研究将ε－酞菁铜（ε－ＣｕＰｃ）按不同浓度分散在一种聚酯树脂（Ｖｙｌｏｎ２００）中，并布在铝板基上构成光导体。测试结果表明，这种光导体可用作正充电或负充电光导体，但在相同的有效充电电位下，即，在Ｖ－Ｖ＿Ｔ（其中Ｖ＿Ｔ为临界充电电位）相同的条件下，负充电的表面饱和电压高于正充电的表面饱和电压。当ε－ＣｕＰｃ的质量分数超过４０％时，光导体的暗衰减速度过快；当ε－ＣｕＰｃ的质量分数低于２０％时，暗衰减速度虽然得到控制，但光衰减速度太低，而且残留电位大幅度增高。ε－ＣｕＰｃ的质量分数在３０～４０％被认为是适当的。     

卟啉与金属卟啉的光电导性能研究

以苯甲醛和吡咯为原料,丙酸和硝基苯为溶剂,合成了四苯基卟啉(TPP),收率达29.8%。TPP与金属ZnCo、Mn盐合成相应的金属卟啉配合物,收率>90%。用核磁和质谱对化合物结构进行了表征。紫外-可见吸收光谱分析结果表明,TPP有强的Soret吸收带和四个Q带,形成金属卟啉后,Q带减少至两个,且Soret带红移。X射线衍射光谱分析显示,TPP和四苯基金属卟啉粉末均有较高的结晶度。分别以这些卟啉化合物为电荷产生材料,制备了功能分离型双层光电导体,并对它们的光电导性能进行了研究。结果表明,四苯基锌、钴卟啉配合物的光敏性明显优于TPP,其光敏度(E2/3)分别为11和10lx·s。     

α-CuPc/PVK体系光电性能的研究

研究了α-CuPc/PVK体系的伏安特性及等温衰减电流(IDC)。观察到低场欧姆区与高场非欧姆区,其转折场强为1.2×10~4V/cm。在非欧姆区1g(I/V)与V~(1/2)成线性关系,其系数为1.5×10~(-4)eV/(V/cm)~(1/2),符合Poole-Frenkel效应。用简单的弛豫过程处理了不同场强和不同温度的IDC实验结果,得到的活化能随场强增加而减小,符合Poole-Frenkel效应。并用Garofano等人推导的电流密度与弛豫时间的关系式,计算了被陷载流子密度和与温度无关的逸出频率。     

酞菁锌衍生物L—B膜的光电性能研究

用L-B膜方法在SnO_2电极上修饰了不同链长烷氧基取代的酞菁锌化合物(ZnPc C_nH_(2n+1),n=3,9,12,16),分别研究了它们单分子膜成膜性能和转移性能,并测定了修饰在SnO_2电极上的单多层分子膜的光电性能和吸收光谱。研究结果指出链短的取代基即异丙氧基取代的酞菁锌(ZnPcC_3H_7(i))具有较高的转移比及较好的光电性能。     

钒氧酞菁的合成及其薄膜结构与光电性能的研究

自从６０年前［１］金属酞菁被发现以来,就引起人们的广泛兴趣,其原因主要在于它们在染料颜料、光化学、催化、和成像中的应用．和许多其它酞菁衍生物一样,钒氧酞菁具有光导和半导体特性,这使得它在光电子学、电子成像、化学传感器、甚至于微电子器件中有潜在的十分光...     

吡唑啉类化合物的合成及其光电导性能的研究

本文介绍了一种性能优良的载流子传输材料－１－苯基－３－（对甲氧基苯基乙烯基）－５－（对甲氧基苯基）吡唑啉的制备方法。以该化合物为载流传输材料，与不同的载流子发生材料匹配，制成机能分离型有机光电导体。这些光电导体都显示出良好的光电导性能。     

近红外高感光度有机光导体—Y—氧钛酞菁的研究

随着半导体激光（ＬＤ）在技术上的不断成熟,其作为激光印字机、图象照排机、数字打样机、以及数字印刷机的扫描光源被广泛应用,开发研制近红外光谱区高感光度的有机光导体成为目前光导体研究的一个前沿．在静电照相用有机光导体中,以酞菁类有机光导体最为引人注目,多...     

酞菁化合物光电导材料的研究与开发

酞菁类化合物是一类新型的有机光电导材料。综述了酞菁化合物及其衍生物在感光元件、LB膜、太阳能光电池、非线性光学等方面的应用研究概况。     

近红外敏感的功能分离型有机光接受体系的光导性能研究Ⅰ．酞菁氧钒晶粒尺寸对其体系光导性能的影响

近红外敏感的功能分离型有机光接受体系的光导性能研究Ⅰ．酞菁氧钒晶粒尺寸对其体系光导性能的影响刘广宁，王艳乔，任德源，邱家白（中国科学院化学研究所，北京１０００８０）关键词酞菁氧钒，电照相，光接受器件激光打印和静电复印技术是当今信息处理、加工与传递的重...     

磺化酞菁镓的二聚现象研究

采用分光光度法研究了磺化酞菁镓的二聚现象；测定了二聚常数Ｋｄ，讨论了ｐＨ值、离子强度、水、温度等因素对Ｋｄ的影响。研究结果表明：磺化酞菁镓的二聚反应可表示成： ２ＳＰｃＧａＯＨ→（ＳＰｃＧａ）２Ｏ＋Ｈ２Ｏ且磺化酞菁镓的二聚常数随着离子强度、磺酸基数目、水的浓度的增加而增加。     

Study of Pb(II) in various H2O-H2SO4 mixtures by differential pulse polarography: solubility of lead sulphate,diffusion coefficient of Pb(II) and half-wave potential of Pb(Hg)/Pb(II)

A study of some properties of Pb(II) in solutions of sulphuric acid was carried out by means of differential pulse polarography. The range of concentrations of acid extended from 0.6 to 70 weight % of H₂SO₄ (0.06-11.5 M). Determination of the solubility of lead sulphate was found to be in good agreement with NBS's results in the range of H₂SO₄ concentrations they studied. With increasing concentration in H₂SO₄, the diffusion coefficient was found to decrease more than expected from the Stokes-Einstein equation, while the standard potential of Pb/Pb(II) related to she was found to increase. This led to a more important self-discharge of the negative electrode of the lead-acid battery.     

Hydrogen fluoride-catalysed alkylations of Pittsburgh Seam (hvb) coal

Friedel-Crafts type alkylations of Pittsburgh Seam (hvb) coal using several alcohols as alkylating agents and anhydrous hydrogen fluoride as catalyst rendered the coal approximately 50% and 90% extractable by tetrahydrofuran and pyridine, respectively. The initial extractability of the coal was 8% in tetrahydrofuran and 20% in pyridine. Similar changes were obtained with an Illinois No. 6 coal by similar treatment. However, in all the alcohol alkylations described, accompanying polymerization and condensation of the alcohols complicated the results.     

Electrochemical reduction of 4-(2′-thienyl)quinazoline in acid solutions

The electrochemical behaviour of 4(2′-thienyl)quinazoline (4-TQ) was studied in acid solutions of varying ionic strengths using polarography, cyclic voltammetry and controlled-potential electrolysis. 4-TQ is reduced in two single electron steps to give the dihydro-4-TQ product. The two polarographic waves were found to be diffusion-controlled, the first wave being reversible and the second wave irreversible. On the basis of the results obtained, a mechanism is suggested for 4-TQ reduction in which a dimerization reaction goes in parallel with the electron-transfer step.     

13C and 1H n.m.r. dynamic study of poly(γ-benzyl-l-glutamate) poly(β-benzyl-l-aspartate) and poly(l-alanine) in solution

¹H T₁ relaxation times were measured in solutions of poly (γ-benzyl-l-glutamate), PBLG, and poly(β-benzyl-^l-aspartate), PBLA, and ¹³C T₁ relaxation times, NOE factors and line widths in solutions of the two polypeptides and of poly(l-alanine), PLA, over a broad range of solvent composition (CDCI₃—trifluoroacetic acid) including the helix—coil transition. PBLG was also studied through temperature-induced inverted helix—coil transition. Most relaxation parameters change smoothly over the studied range, and the observed changes correspond to increase of mobility with increasing content of trifluoroacetic acid and with increasing temperature except for PBLG which undergoes an inverted helix—coil transition with temperature. Analysis of experimental data by means of the isotropic model yielded, for the backbone carbons of all three polypeptides, τ_eff ～ 2 × 10^?8 sec in the helix and τ_eff ～ 1 × 10^?9 sec in the coil form. For the side-chain carbons, τ_eff decreases in the range 10^?9 ? 10^?10 sec with increasing distance from the backbone, with τ_eff values consistently lower in the coil form. Results of analysis by means of a model with two correlation times are discussed.     

A mechanism of ionic conduction of poly (vinylidene fluoride)-lithium perchlorate hybrid films

Polymeric solid electrolytes were prepared by the hybridisation of poly(vinylidene fluoride) and lithium perchlorate. These were obtained as films of about 0.1 mm thickness, and showed high lithium ionic conductivity of about 10^?5 (S cm^?1). The conductivity depended on the contents of lithium perchlorate and polar additives having high boiling temperature. The amount of lithium perchlorate and the logarithm of the conductivity showed linear relation up to a certain (critical) amount of lithium perchlorate. Beyond the critical value, crystals of lithium perchlorate grew in polymer matrix, and the conductivity was not increased so much. Viscosity and dielectric constant of the additives were potent factors to increase the conductivity of the hybrid film. Organic polar materials with lower viscosity such as N,N-dimethyl formamide or γ-butyrolactone strongly contributed to the improvement of lithium ionic conductivity. The activation energy of conduction decreased dramatically by increasing mole ratio of additive and lithium perchlorate. The lithium ions were considered to migrate in the conduction path which was formed by polymer matrix with organic additive molecules.     

Redox reaction of tri(2-deoxy-2-L-ascorbyl)amine. Formation of a persisting free radical species in water

Electrochemical studies showed that tri(2-deoxy-2-L-ascorbyl)amine ($\text{1}$), a new compound isolated as one of the products of reaction of dehydro-L-ascorbic acid with phenylalanine (with added L-ascorbic acid) in ethanol, is oxidized in aqueous solution in two reversible one-electron transfer steps, on mercury or platinum electrode. The first step occurs through the dianion, and its product is an unusually stable blue anion radical giving a characteristic ESR signal. The product of the second step of oxidation is labile and is slowly converted into the oxidized form of di(2-deoxy-2-L-ascorbyl)amine, presumably by hydrolysis with splitting of L-ascorbic acid.     

Effect of water content on the corrosion behaviour of Ni in methanol (MeOH) solutions

The effect of water content on the corrosion behaviour of nickel in methanolic solutions have been investigated tracing the potentiostatic curves at room temperature in a standard electrochemical cell.Preliminary results reported in this communication, shown that the electrochemical behaviour of Ni in MeOH is strongly influenced by the water content of the solution and that traces of water (of the order of 0.5%) are able to guarantee the passivity of nickel.     

Thermodynamic studies of sodium bromide in 2-propanol—water mixtures (10, 30 and 50 wt.%) from electromotive force measurements

The emf of the cell: Pt|Na(Hg)|NaBr(m), w wt.% 2-propanol—water mixture|AgBr, Ag has been measured with w = 10, 30 and 50 at temperatures of 293.15, 303.15 and 313.15 K in the molality range of NaBr from 0.04 to 0.18 mol kg^?1. From these data the standard emf of the cell has been obtained and by utilizing data from the literature for the E⁰ of Ag/AgBr electrode the standard potential of sodium amalgam electrode has been determined. Mean activity coefficients of NaBr and thermodynamic functions ΔG⁰_t, ΔH⁰_t and ΔS⁰_t for transfer of NaBr from water to 2-propanol—water mixtures have also been calculated. Thermodynamic quantities of transfer have been compared to those for the HBr electrolyte.