Electronic structure and property studies of the first crowned [60] fulleropyrrolidine

The computations of the electronic structures and properties of a novel crowned [60] fulleropyrrolidine (CFP) were performed by means of AM1 methods. It has been indicated that CFP has four isomers in which the dihedral angle between phenyl group and pyrrolidine ring is around ±90°. The study of electronic structures showed that the energy levels of frontier orbitals are determined mainly by C_(60). C_(60) acted as an electronic acceptor, whereas crown ether acted as an electronic donor, which implies that there exists intramolecular charge transfer effect in this molecule. The study of nonlinear optical properties implied that the hyperpolarizability of CFP can match that of p-nitroaniline. In the meantime, the hyperpolarizability properties of CFP could be influenced by the orientation of crown ether moiety.     

Effect of Addition Groups on the Redox Properties of Fullerenes

采用循环伏安法和微分脉冲伏安法对比地研究了包括五种Ｃ６０的衍生物及四种Ｃ７０的衍生物的电化学性质．结果表明，推电子基团的引入使得富勒烯的氧化还原电位负移，这种负移的程度与加成基团的性质、个数和富勒烯的性质有关．对于Ｃ６０和Ｃ７０的单加成产物，负移的范围是０．０８～０．２０Ｖ．而对于Ｃ６０的双加成和三加成产物负移的范围分别为０．３０～０．３２Ｖ和０．５３～０．５８Ｖ．同时由于电位的负移大部分衍生物在低于＋１．５Ｖ（ｖｓ．ＳＣＥ）观察到了氧化峰，而Ｃ６０和Ｃ７０本身的氧化高达＋１．７Ｖ（ｖｓ．ＳＣＥ）．特别是对于Ｃ７０的双加成产物在＋０．４５Ｖ（ｖｓ．ＳＣＥ）出现了一个不可逆氧化峰，但是，对于同样加成基团的Ｃ６０双加成产物的氧化却在＋０．９０Ｖ（ｖｓ．ＳＣＥ），说明由于推电子基团的双加成引入，明显改变了Ｃ７０的电负性．     

YBa2Cu3O7-x高Tc超导体的热转变

自朱经武等最先报道液氮温区Y—Ba—Cu—O体系超导体以来，世界上涌现第二次高Tc超导体研究热潮。材料的烧结与退火均在高温下进行，尤以退火条件对超导性能好坏影响为大。因此，高温热转变的研究对于优良材料的获得及超导机制的认识都至为重要。迄今     

LB膜势垒层高T_c薄膜边缘结的几个实验现象

本文介绍了采用有机分子薄膜 LB 膜(Langmuir-Blodgett)作为势垒层边缘结的制备方法.文中给出了在这种结上所观察到的几种不同的电流-电压曲线,并作了若干讨论.     

聚合物非线性光学特性和器件的研究现状

与实用的无机非线性光学晶体相比，聚合物具有许多突出的优点，已经成为当今相当活跃的研究课题之一．本文简要介绍了共轭聚合物和极化聚合物的作线性光学特性及其在集成电光和全光信息处理等光电子器件中应用的研究现状．     

两亲8-氨基喹啉化合物的LB膜及其电致发光器件

以8-氨基喹啉为亲水头基合成了两亲配体2-十二烷基丙二酸二(8-氨基喹啉)酰胺(H2A)的钢配合物(CuA)。研究了H2A、CuA在纯水亚相和H2A在CuCl2亚相表面的成膜性能。H2A与亚相中的Cu^2 发生配位形成了配合物(Cu-H2A)。X射线光电子能谱表明，H2A通过氮原子与Cu^2 配位，配位比为1：1。CuA的成膜性能最好，其次是Cu/|H2A。以H2A、Cu-H2A和CuA的LB膜制备了三层电致发光器件：ITO／TPD／LB膜/Alq3／Al，其起亮电压分别为7．5、6．7和6．5V，最大亮度分别为630、352和376cd/m^2，电致发光光谱的发射峰分别为503、510和514nm。配合物较弱的电致发光性能归因于Cu^2 的荧光淬灭作用．     

ELECTRICAL PROPERTIES, EQUATIONS OF STATE AND PHASE TRANSITION IN SOLID C60 AT HIGH PRESSURE

Electrical properties and equations of state in solid C₆₀ at room temperature and high pressure have been studied in a diamond anvil cell using capacitance and resistance measurements and a piston-cylinder type device using P-V measurements, respectively. Experimental results by capacitance and P-V measurements indicate that solid C₆₀ also undergoes a phase transition at room temperature and a lower pressure, about 2GPa. The phase transition may be from a face-centered-cubic to a simple-cubic structure.     

Crystal Structures and Magnetic Studies of Naphthalene Derivatives Containing Nitronyl Nitroxides

Introduction　　Inrecentyears,greatattentionhasbeenpaidtoorganicferromagnetism ,1mainlystimulatedbythediscoveryofthefirstgenuineorganicferromagnet (p NPNN)in 1991.2 Infact,bynowtensoforganicferromagnetshavebeensynthe sizedandwellcharacterized ,3 5buttheirferromagnetictransi tiontemperaturesarestilllow .Mostofthestudiesinthisfieldareconcentratedonnitronylnitroxidederivatives.Ononehand ,variousmulti nitronylnitroxidecompoundshavebeenprepared6 withthehopetoincreasetheintermolecularspin spininte…     

有机单晶场效应晶体管

有机单晶场效应晶体管的研究对于探索电子的本质特性具有十分重要的意义.近几年来,不管是在制备技术还是在器件性能的研究方面,有机单晶场效应晶体管均取得了很大的进步,并由此引起了社会的广泛关注,成为场效应晶体管领域的一个重要研究方向.本文主要介绍了有机单晶的生长方法、有机场效应器件的各种制备技术、器件的迁移率及其影响因素,并对有机单晶场效应晶体管的发展前景和面临的一些问题作了简要的讨论.