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Host-guest complexes of cucubit[8]uril with phenanthrolines and some methyl derivatives 总被引:1,自引:0,他引:1
DAY Anthony I 《中国科学B辑(英文版)》2005,48(4):305-314
Cucurbituril a molecular container (or host) has a rigid hollow interior cavity which is large enough to accommodate, one or more, smaller molecules (or guests). The cavity is accessible through two carbonyl portal openings. Molecules or guests enter the … 相似文献
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[Co(2,3-tir)(amp)Cl]ZnCl4体系中三个几何经式异构体的 识别 总被引:2,自引:0,他引:2
对[Co(2,3-tir)(amp)Cl]ZnCl42,3-tri=N-(2-aminoethyl)-1,3-propanediamine;amp=2-(aminomethyl)pyridine)体系进行了合成,分离出四个配合物。用单晶X射线衍射分析了两个结构,用二维核磁共振DQCOSY和NOESY技术联合解板了另一结构。结构解析显示它们为该体系的四个几何经式异构体(meridianisomers)。两个晶体结构都属中心对称的空间群,表明它们都是外消旋的对映体。 相似文献
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MA Peihua DONG Jun XIANG Shuangchun XUE Saifeng ZHU Qianjiang TAO Zhu ZHANG Jianxin & ZHOU Xin . Institute of Applied Chemistry Guizhou University Guiyang China . The Key Laboratory of Chemistry for Natural Products of Guizhou Province Guiyang China 《中国科学B辑(英文版)》2004,47(4)
Since the structure of cucurbituril(Q[6]) has been determined in 1981[1] and its homologues cucurbit [n = 5,7,8 and 10]uril(Q[5], Q[7], Q[8] and Q[10]) have been reported in 2000[2,3], 2002[4], a series of host-guest complexes[5—7], novel supramolecular as-semblies[8—10], molecular encapsulates[11,12] and mo-lecular containers[13,14] based on Q[n] have been stud-ied extensively. All cucurbituril homologues have common char-acteristic features, i.e. hydrophobic cavity, and polar carbonyl gr… 相似文献
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Ma?Peihua Dong?Jun Xiang?Shuangchun Xue?Saifeng Zhu?Qianjiang Tao?Zhu?Email author Zhang?Jianxin Zhou?Xin 《中国科学B辑(英文版)》2004,47(4):301-310
Three guests with two moiety probes for different Cucurbit[n = 6-8]urils have been synthesized. They are N-(2-methylenethiophen)-adamataneamine, N-(2-methylene pyrrole)-adamataneamine
and N-(2-methylenefurfuran)-adamataneamine. The probes are methyle-nepyridyl typically for Q[6] and adamataneamine typically
for Q[7]. The host-guest complexes of Cucurbit[n = 6-8]urils with these guests have been investigated by using NMR techniques
and ESMS method. Also, thermoanalysis has been used for exploring relationship of enthalpy and stability of the host-guest
complexes. 相似文献
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利用瓜环外壁的结构导向作用设计并构筑瓜环-金属离子超分子配位聚合物可能成为瓜环配位化学研究的一个新方向。根据瓜环外壁作用类型,研究内容包括:1) 瓜环外壁取代烷基推电子效应对瓜环基超分子配位聚合物形成的促进作用;2) 瓜环外壁与化合物芳环的相互作用对瓜环基超分子配位聚合物形成的促进作用;3) 瓜环外壁与无机阴离子的相互作用对瓜环基超分子配位聚合物形成的促进作用;4) 瓜环外壁取代羟基的配位作用对瓜环基超分子配位聚合物形成的促进作用。这些瓜环基超分子配位聚合物可能具有吸附捕集、分离提纯和分析等功能性质。 相似文献
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Curcurbit[n]uril(Q[n])-based supramolecular frameworks(QSFs) constructed from the outer surface interaction of Q[n]s(OSIQ) have the characteristic of simplicity,diversity and modulability.Their simplicity is reflected in their simple composition and preparation methods used for QSFs.The diversity of supramolecular organic frameworks(SOFs) is reflected in the synthesis methods and structural characteristics of the as-obtained QSFs,as well as the variety of structural directing agents and basic building blocks used to prepare QSFs.The modulability is reflected by the controllable channel size in the QSFs,which can be adjusted using different sizes of Q[n]s.In this work,the first re ported cucurbituril Q[6]was selected as the basic building block and three Q[6]-based su p ramolecular frameworks were obtained from aqueous HCl solutions in the presence of [CdCl4]2-respectively.The OSIQs are the main driving forces for the formation of these frameworks.This study shows the diversity of the QSFs. 相似文献
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N-烷基取代丙烯酰胺共聚体系热敏性质研究 总被引:3,自引:0,他引:3
N 烷基取代丙烯酰胺共聚体系热敏性质研究祝黔江(贵州农学院基础部贵阳550025)陶朱马培华刘敏(贵州大学化学系应用化学研究所贵阳550025)关键词共聚N 烷基取代聚丙烯酰胺,浊化温度,浓度,共聚比具有透明 白浊热可逆性质的高聚物在三十年前就已有... 相似文献
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Chong Liu Butian Chen Tianran Zhang Jicheng Zhang Ruoyu Wang Jian Zheng Qianjiang Mao Prof. Xiangfeng Liu 《Angewandte Chemie (International ed. in English)》2023,62(22):e202302655
Sulfide electrolytes with high ionic conductivity hold great promise for all-solid-state lithium batteries. However, the parasitic redox reactions between sulfide electrolyte and Li metal result in interfacial instability and rapid decline of the battery performance. Herein, a redox-resistible Li6PS5Cl (LPSC) electrolyte is created by regulating the electron distribution in LPSC with Mg and F incorporation. The introduction of Mg triggers the electron agglomeration around S atom, inhibiting the electron acceptance from Li, and F generates the self-limiting interface, which hinders the redox reactions between LPSC and Li metal. This redox-resistible Li6PS5Cl-MgF2 electrolyte therefore presents a high critical current density (2.3 times that of pristine electrolyte). The LiCoO2/Li6PS5Cl-MgF2/Li cell shows an outstanding cycling stability (93.3 %@100 cycles at 0.2 C). This study highlights the electronic structure modulation to address redox issues on sulfide-based lithium batteries. 相似文献
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Zheng Limei Zhu Jiannan Zhang Yunqian Zhu Qianjiang Xue Saifeng Tao Zhu 《Supramolecular chemistry》2013,25(8):709-716
The symmetrical dicyclohexanocucurbit[6]uril has been synthesised by the controlled condensation of the diether of cyclohexanoglycoluril (1) and the dimer of glycoluril (2). The symmetrical dicyclohexanocucurbit[6]uril, (CyH)2Q[6], characterised by the 1H NMR spectroscopy, ESMS and further confirmed by single crystal X-ray diffraction of a cobalt aqua exclusion complex, which demonstrates an ellipsoid cavity. Within a cucurbit[6]uril ellipsoid cavity, an inclusion complex of 5,5′-dimethyl-2,2′-bipyridine adopts a preferred orientation, aligning with the longest axis. The ellipsoid cavity is further supported by semiempirical AM1 gas phase calculations. Preferential orientation of a guest within the ellipsoid cavity of the symmetrical dicyclohexanocucurbit[6]uril 相似文献