共查询到17条相似文献,搜索用时 187 毫秒
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本文用水热法合成得到一个六元瓜环(Q[6])与一氯三水(4-吡啶甲酸)合镉(Ⅱ)配位聚合物自组装作用形成的超分子自组装体Q[6]·[Cd(H_2O)_3Cl(4-PCA)]_2·22(H_2O)。自组装体的形成源于瓜环的外壁作用,即Q[6]正电性静电势外壁与配位聚合物中4-吡啶甲酸吡啶环和配位Cl~-离子间的超分子相互作用,以及配位聚合物镉(Ⅱ)离子上配位水分子与瓜环端口羰基氧原子间的氢键作用。该自组装体对溶液中染料具有吸附作用和光催化降解的性能。 相似文献
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通过引入2,7-萘二磺酸(2,7-NDA2-)阴离子作为结构导向剂,与五元瓜环(Q[5])和过渡金属离子(Co2+、Ni2+、Zn2+、Cd2+)在水热条件下制备了4种新颖的Q[5]基超分子自组装体(Q[5]-SA),即{[M (H2O)4(Q[5])]·(NDA)}·xH2O (M=Co (1)、Ni (2)、Zn (3))和{[Cd2Cl2(H2O)4(Q[5])]·(NDA)}·13H2O (4)。单晶X射线衍射测试结果表明,自组装体1~3同构,其中Q[5]仅一端的部分端口羰基氧原子与金属离子配位形成简单配合物;而4中Q[5]的2个端口均与金属离子Cd2+配位形成了一维配位链。在自组装体1~4中,配体2,7-H2NDA均全脱质子,形成2,7-NDA2-阴离子平衡体系电荷,但均未能与金属离子配位,而在2,7-NDA2-阴离子与Q[5]外壁之间的瓜环外壁作用下进一步形成三维超分子结构。此外,还研究了自组装体1和4的荧光传感性能,结果表明它们都能够作为抗生素诺氟沙星(NFX)的比率型荧光探针。 相似文献
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以2,7-萘二磺酸(2,7-H2NDA)作为结构导向剂,与五元瓜环(Q[5])和碱金属、碱土离子(K+、Rb+、Mg2+、Ca2+)在水热条件下制备出了4种新颖的Q[5]基超分子自组装体[K2(H2O)4(Q[5])](2,7-NDA)·4H2O (1)、[Rb2(H2O)5(Q[5])](2,7-NDA)·3H2O (2)、[Mg (H2O)4(Q[5])](2,7-NDA)·8H2O (3)和[Ca (H2O)4(Q[5])](2,7-NDA)·10H2O (4)。单晶X射线衍射测试结果表明,自组装体1和2具有相同的结构: Q[5]分子与金属离子配位形成的是“分子胶囊”;而在3中Q[5]与Mg2+配位形成的是1:1型简单配合物结构;在自组装体4中,Q[5]与Ca2+配位形成的是一维Q[5]-Ca2+配位聚合物链结构。这些结构中2,7-NDA2-阴离子平衡了体系电荷,且通过其与瓜环外壁之间的弱相互作用,促进自组装体最终构筑成三维超分子结构。此外,还研究了自组装体4的溶剂识别荧光传感性能,结果表明其能够作为有机溶剂丙酮和DMF的猝灭型荧光探针。 相似文献
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Coordination of Alkaline Earth Metal Ions in the Inverted Cucurbit[7]uril Supramolecular Assemblies Formed in the Presence of [ZnCl4]2− and [CdCl4]2− 下载免费PDF全文
Qing Li Yun‐Qian Zhang Qian‐Jiang Zhu Sai‐Feng Xue Zhu Tao Prof. Dr. Xin Xiao 《化学:亚洲杂志》2015,10(5):1159-1164
A convenient method to isolate inverted cucurbit[7]uril (iQ[7]) from a mixture of water‐soluble Q[n]s was established by eluting the soluble mixture of Q[n]s on a Dowex (H+ form) column so that iQ[7] could be selected as a ligand for coordination and supramolecular assembly with alkaline earth cations (AE2+) in aqueous HCl solutions in the presence of [ZnCl4]2? and [CdCl4]2? anions as structure‐directing agents. Single‐crystal X‐ray diffraction analysis revealed that both iQ[7]–AE2+–[ZnCl4]2?–HCl and iQ[7]–AE2+–[CdCl4]2?–HCl interaction systems yielded supramolecular assemblies, in which the [ZnCl4]2? and [CdCl4]2? anions presented a honeycomb effect, and this resulted in the formation of linear iQ[7]/AE2+ coordination polymers through outer‐surface interactions of Q[n]s. 相似文献
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通过引入2,7-萘二磺酸(2,7-NDA2-)阴离子作为结构导向剂,与五元瓜环(Q[5])和过渡金属离子(Co2+、Ni2+、Zn2+、Cd2+)在水热条件下制备了4种新颖的Q[5]基超分子自组装体(Q[5]-SA),即{[M(H2O)4(Q[5])]·(NDA)}·x H2O(M=Co (1)、Ni (2)、Zn (3))和{[Cd2Cl2(H2O)4(Q[5])]·(NDA)}·13H2O (4)。单晶X射线衍射测试结果表明,自组装体1~3同构,其中Q[5]仅一端的部分端口羰基氧原子与金属离子配位形成简单配合物;而4中Q[5]的2个端口均与金属离子Cd2+配位形成了一维配位链。在自组装体1~4中,配体2,7-H2NDA均全脱质子,形成2,7-NDA2-阴离子平衡体系电荷,但均未能与金属离子配位,而在2,7-NDA2-阴离子与Q[5]外壁之间的瓜环外壁作用下进一步形成... 相似文献
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The isotopomers of L-tryptophan (L-Trp) labeled with hydrogen isotopes in the indole ring were obtained by isotope exchange
method. Heavy and tritiated water were used as the sources of stable and radioactive label. Three isotopomers, i.e., [4′-2H]-L-Trp, [4′-3H]-L-Trp, and doubly labeled [4′-2H/3H]-L-Trp were synthesized by isotope exchange enhanced by irradiation with a mercury discharge lamp. The indole whole ring
labeled isotopomers, i.e., [2′,4′,5′,6′,7′-2H5]-L-, [2′,4′,5′,6′,7′-3H5]-L-, and doubly labeled [2′,4′,5′,6′,7′-2H/3H]-L-Trp were synthesized by isotope exchange between L-Trp and D2O or DTO in the presence of deuteriated trifluoroacetic acid. 相似文献
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Xin-Xin Xu Xia Zhang Xiao-Xia Liu Ting Sun Yu-Hong Wang 《Transition Metal Chemistry》2009,34(5):571-577
Reduced molybdophosphate-based supramolecular compounds, such as (4,4′-H2bipy)[Co(H2O)2]2[Co(H2PO4)2(HPO4)4(PO4)2(MoO2)12(OH)6] · 17H2O (1), [Co(2,2′-bipy)2(H2O)]4[Co(H2O)2][Co(HPO4)6(PO4)2(MoO2)12(OH)6] · 2H2O (2), and [Co(2,2′-bipy)2(H2O)]4[Co(H2PO4)(H2O)2]2[Co(HPO4)6(PO4)2(MoO2)12(OH)6] · 8H2O (3) (4,4′-bipy=4,4′-bipyridine, 2,2′-bipy=2,2′-bipyridine), have been synthesized under hydrothermal conditions and characterized.
Compound 1 exhibits a three-dimensional supramolecular twofold interpenetrating architecture built up of one-dimensional [P4Mo6]-based infinite covalent chains and free 4,4′-bipy molecules. Compound 2 also shows a three-dimensional supramolecular network constructed from one-dimensional covalent [P4Mo6]-based chains. Unlike compounds 1 and 2, compound 3 exhibits an interesting three-dimensional ‘honeycomb-like’ supramolecular network constructed by the stacking of [Co(2,2′-bipy)2(H2O)] units with one-dimensional channels, in which the [P4Mo6]-based polyoxometalate chains are located. The magnetic properties of compounds 2 and 3 are reported.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
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Krishna C. Majumdar Subhojit Ghosh 《Monatshefte für Chemie / Chemical Monthly》2002,133(10):1317-1323
Summary. Regioselective heterocyclization of 3-(cyclohex-2′-enyl)-4-hydroxy-6-methyl pyran-2-one with various reagents afforded different
heterocycles. With N-iodosuccinimide in acetonitrile at 0–5°C it gave 6-methyl-9′-iodo-2′-oxabicyclo[3.3.1]nonano[3,2-c]pyran-2-one, with C5H5NHBr3 or C6H12N4HBr3 in CHCl3 at 0–5°C it furnished 6-methyl-9′-bromo-2′-oxabicyclo[3.3.1]nonano[3,2-c]pyran-2-one. Cold concentrated H2SO4 lead to 6-methyl-2′-oxabicyclo[3.3.1]nonano[3,2-c]pyran-2-one, whereas PdCl2(PhCN)2 in C6H6 at 80°C afforded 9-methyl benzofuro[3,2-c]pyran-2-one.
Corresponding author. E-mail: kcm@klyuniv.ernet.in
Received December 27, 2001. Accepted (revised) March 1, 2002 相似文献