微孔电极支撑的液/液界面上电子转移反应的研究

应用传统的三电极体系在微孔电极尖端支撑的液／液界面上，采用循环伏安法、计时电流法、方波伏安法研究了互不相溶电解质界面(1TIES)上铁氰化钾／亚铁氰化钾(水相)和二茂铁(有机相)的电子转移反应，计算得到反应中二茂铁在有机相中的扩散系数．实验证明该方法操作简便易行，是研究液／液界面上电子转移反应的有效工具．     

应用固-液相转移催1化方法合成肌醇磷酸脂

固-液相转移催化方法已成功地应用于各种肌醇磷酸脂的合成.在固- 液相转移催化条件下,肌醇衍生物O-烷基化的选择性得到了有效的改进;而在固- 液相转移催化条件下的atheron-todd反应,为肌醇衍生物的磷酰化提供了一个良好的新方法.     

Nonlinear Shift of the Raman A1 Mode in Ga-Incorporated CuInSe2 Thin Films

Composition dependence of quaternary CuIn1-x GaxSe2 films on Ga content has been systematically investigated by Raman scattering. The dominant A1 mode shifts from 174cm^-1 for CuInSe2 to 185cm^-1 for CuGaSe2 in an approximately polynomial curve other than a linear curve, indicating existence of asymmetric distribution of Ga and In on a microscopic scale in films. With Ga content x 〉 0.3, the significantly broadening and intensity decrease of A1 modes suggest the degradation of crystalline quality of chalcopyrite phase. Additionally, the quenching of additional Raman band at 183cm^-1 for the Ga-rich films reveals that CuAu-ordered phase can coexist in nominal chalcopyrite CuInSe2 films but not in CuGaSe2, due to Ga inhibition effect.     

Thermodynamic Analyses of the Solid-Liquid Interface and Growth Mode Transition in Undercooled Melts

Free energy change for atoms transferred from fiquid on to liquid-solid interface is calculated according to the structural model proposed by Jackson. Relationship among the change in free energy, the fraction of sites on the interface occupied by atoms and the interracial undercoollng is presented. This relationship can be used to judge the possible state that an interface may take, and to predict the corresponding crystal growth mode. For silicon and germanium, the experimentally observed growth mode transition from lateral growth at small undercooling to continuous growth at large undercooling is hardly to be explained by this thermodynamic calculation, which implies that the transition is possibly caused by some dynamic reasons. For nickel, crystallization is carried out only by the continuous mode, which is consistent with the experimental observations.     

ω-甲亚砜基苯乙酮阴离子与对硝基苄基衍生物的反应

Russell 等于六十年代曾用 ESR 的方法和化学方法证实某些脂肪族和芳香族硝基化合物与各种阴离子之间发生单电子转移,时-硝基苄基衍生物也可以与许多阴离子反应。我们则进一步研究对-硝基苄基衍生物(1～4)与ω-     

何谓纠缠态

 目前,关于纠缠态(Entanglement)的文章在国外一些科技期刊上屡屡出现,例如2004年的《物理评论通讯》(PhysicalReviewLetters)几乎每期都登载有有关“纠缠态”的学术论文。本刊2004年第2期所载方玉田同志的文章《谈谈纠缠态》学术性较强,现拟向读者简介“何谓纠缠态”(下面提到的“态叠加原理”参见方文,不作解释了)。     

曙红染料-碘鎓盐复合体系的光化学性质和引发丙烯酸酯光交联的效果

合成了曙红(EO)二苯基碘鎓盐(DPIO)复合光引发体系,其光响应范围可至可见光区,最大吸收527nm。曙红鎓盐体系无暗反应,但在可见光作用下,由于光诱导电子转移敏化反应使染料发生漂白作用和鎓盐裂解产生活性自由基,由此可引发环氧6101双丙烯酸酯和季戊四醇三丙烯酸酯的光固化。光固化速度与复合体系的结构组成有关,其中曙红双盐(EO(Ph_I)_2)比曙红单盐(EO(Ph_2I))具有更高的引发效率;在同样条件下双分子体系(EONa_2+Ph_2I+BF_4~-)不能引起交联反应。     

50MeV/A12C轰击197Au和209Bi核的线动量转移

用裂变碎片折叠角技术测得50MeV/A¹²C轰击¹⁹⁷Au和²⁰⁹Bi靶的线性动量转移分布,得到每个¹²C核核子线动量转移的最可几值与靶核相关,其值分别为184和173MeV/c.在线动量转移分布中,0.3附近有一小的突起,似乎可以认为是相应于弹核的α集团转移.     

2,5─哌嗪二酮与α,β─不饱和醛反应研究

综合运用了多种波谱学方法及化学手段确证并归属了2,5-哌嗪二酮与α,β-不饱和醛在超声波分散金属钾及双季铵盐作用下反应产物的立体化学与核磁共振信号,为研究这个反应提供了有用的信息.     

基团转移聚合研究的最近进展

对基团转移聚合在引发剂、单体、催化剂、立体化学、嵌段和星型共聚物、终止反应、链转移反应以及应用方面的最近进展,进行了介绍和评述。