{"title":"六元瓜环/1,2-乙二胺的超分子化合物结构及相互作用模式","authors":"曹荣 林景祥, Cao Rong Lin Jing-Xiang","doi":"10.1360/ZB2009-39-3-275","DOIUrl":"https://doi.org/10.1360/ZB2009-39-3-275","url":null,"abstract":"合成了六元瓜环与链状烷基二胺(1, 2-乙二胺)形成的超分子化合物. 采用X射线衍射技术测定了其晶体结构, 并得到元素分析、热重、红外光谱的佐证, 揭示了主客体相互作用的模式. 还采用1H NMR 技术研究了溶液中六元瓜环与乙二胺的超分子相互作用. 研究表明, 在不同的环境下瓜环与客体采取相异的超分子作用模式, 晶体结构中显示一个六元瓜环的两个端口通过离子偶极作用以不同的作用模式分别跟两个乙二胺客体分子形成一个三单元组成的超分子作用实体; 而在溶液中瓜环与乙二胺的相互作用模式与晶体中的不同.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"30 1","pages":"275-280"},"PeriodicalIF":0.0,"publicationDate":"2009-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87945955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
刘奕 陈云 曾宇平 汪世龙, Chen Yun Ceng Yu-Beng Hong Shi-Long Liu Yi
{"title":"Fe 3 O 4 纳米材料的低温溶剂控制合成及其磁性质","authors":"刘奕 陈云 曾宇平 汪世龙, Chen Yun Ceng Yu-Beng Hong Shi-Long Liu Yi","doi":"10.1360/ZB2009-39-2-121","DOIUrl":"https://doi.org/10.1360/ZB2009-39-2-121","url":null,"abstract":"报道了一种低温(60℃~100℃)溶剂控制合成立方相Fe 3 O 4 及正交相FeOOH等纳米材料的简易方法, 即采用氯化亚铁为铁源, 六亚甲基四胺为弱碱源, 借助回流装置, 通过改变反应温度、溶剂(分别以水、水与乙醇、水与乙二醇为溶剂)、时间等实验条件, 合成出正交相的FeOOH、正交相FeOOH与立方相Fe 3 O 4 的混合物以及立方相Fe 3 O 4 磁性纳米粒子. 利用X射线衍射仪(XRD)、透射电子显微镜(TEM)、物性磁测量系统以及穆斯堡尔光谱仪对产物进行了表征和分析. 结果显示, 所制备的混合相磁性纳米粒子为片状和棒状, 而立方相的的Fe 3 O 4 磁性纳米粒子呈颗粒状. 磁测量表明立方相的Fe 3 O 4 比混合相磁性纳米粒子有更大的磁饱和强度, 对立方相的Fe 3 O 4 纳米粒子进行穆斯堡尔谱分析可以明确判断所合成的样品是Fe 3 O 4 , 而不是γ- Fe 2 O 3 . 此外, 通过对实验过程、现象及表征结果等的分析; 对不同条件下Fe 3 O 4 磁性纳米粒子的形成机理做了初步探讨.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"5 1","pages":"121-128"},"PeriodicalIF":0.0,"publicationDate":"2009-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87905355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"立体效应和分子内诱导效应对R—X(R=烷基)键离解能变化趋势的影响","authors":"曹晨忠","doi":"10.1360/ZB2009-39-1-46","DOIUrl":"https://doi.org/10.1360/ZB2009-39-1-46","url":null,"abstract":"解释了“为什么R—X键离解能变化趋势不相同”的问题. R—X 键离解能(BDE)可归因于3个主要因素：C—X固有健能, 1,3成对排斥和分子内电荷-诱导偶极. 当X原子给定, R—X(R= Me, Et, i -Pr, t-Bu)的BDE变化趋势由1,3成对排斥和分子内电荷-诱导偶极两个因素控制, 前者减少R—X的BDE, 后者增加或者减少R—X的BDE. 在R—X为R—C键的系列化合物中(例如R—Me, R—CH== CH 2 , R—C≡≡ CH, R—CN等), 1,3成对排斥减少R—X的BDE, R—C键能变化趋势依R=Me, Et, i -Pr, t -Bu次序减小; 对于X原子电负性小于C原子的R—X系列化合物(例如R—H, R—BH 2 , 和R—SiH 2 等), 上述两个因素均减小R—X的BDE, 因而R—X键能变化趋势依R=Me, Et, i -Pr, t -Bu次序减小; 对于X原子电负性大于C原子的R—X系列化合物(例如R—F, R—OH, R—Cl, R—Br, R—I, 和R—NH 2 等), 1,3成对排斥减少R—X的BDE, 而分子内电荷-诱导偶极则增加R—X的BDE, 于是R—X键能变化趋势取决于两者的竞争, 结果表现为：(1) 有的系列R—X键能变化依R=Me, Et, i -Pr, t -Bu次序增大(如R—F, R—OH等); (2) 有的系列R—X键能变化依R=Me, Et, i -Pr, t -Bu次序减小(如R—I); (3) 有的系列R—X键能变化依R=Me, Et, i -Pr, t -Bu次序变化很小(如R—Br).","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"1 1","pages":"46-54"},"PeriodicalIF":0.0,"publicationDate":"2009-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83158297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
佟胜睿 王炜罡 马春平 葛茂发 王殿勋, Wang Wei-Gang Ma Chun-Beng Ge Mao-Fa Wang Dian-Xun Tong Qing-Rui
{"title":"o -, m -, p -IC 6 H 4 OCH 3 的电子结构和取代基效应","authors":"佟胜睿 王炜罡 马春平 葛茂发 王殿勋, Wang Wei-Gang Ma Chun-Beng Ge Mao-Fa Wang Dian-Xun Tong Qing-Rui","doi":"10.1360/zb2009-39-11-1469","DOIUrl":"https://doi.org/10.1360/zb2009-39-11-1469","url":null,"abstract":"采用紫外光电子能谱(UPS)手段结合理论计算研究了有机卤化物 o -, m -, p -IC 6 H 4 OCH 3 的电子结构和取代基效应. 在碘原子和甲氧基两个供电子基团的共同作用下, 这三种碘代苯甲醚的第一电离能均低于相应的碘苯和苯甲醚. 通过取代基效应研究表明碘代苯甲醚为富电子体, 因此在有机合成反应中具有较高的反应活性.","PeriodicalId":49128,"journal":{"name":"Science in China. Series B, Chemistry","volume":"2 1","pages":"1469-1475"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72754156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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