共查询到17条相似文献,搜索用时 203 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)}·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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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)}·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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The crystal-chemical structure of the minerals and inorganic compounds kuznetsovite [Hg3](AsO4)Cl and terlinguaite [Hg3][HgO2]Cl2, as well as [Hg3]3(AsO4)4 and [Hg3]2[HgO2](PO2 and their analogs, is considered from the viewpoint of the packing of large supramolecular atomic groups. The cationic layer of polyhedra around the large [Hg3]4+ cations, alternating with the anionic layer of [HgO2]2-, (AsO4)3-, (PO4)3-, Cl-, plays the major role in structure formation. Segregation of mercury cations of different valences possibly reflects the solid-state transformations occurring in nature and accompanied by mercury liberation. 相似文献
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Mihir K. Chaudhurp Shiv K. Chettri Gagan C. Mandal Pradip C. Paul Satya B. Paul Pendyala Srinivas 《Journal of Chemical Sciences》1995,107(4):305-316
An interpretative account of the results of reactions in aqueous medium of a highly peroxygenated vanadium(V) complex, K [V(O2
3]·3H2O, with different organic and inorganic substrates is presented. The reactions were monitored by solution EPR spectroscopy
and isolation of products at different stages of the reactions. Redox reactions between diperoxide, K[VO(O2)2(H2O)] and VOSO4 were conducted. The results of the investigation suggest that secondary oxygen exchange-reaction occurs which not only depends
on but also utilises the intermediates in the primary reaction during diperoxovanadate-dependent oxidation of VOSO4.
In an interesting reactiontris(acetylacetonato)-manganese(III), Mn(acac)3, on being reacted with a hydrogen peroxide adduct, KF·H2O2, and bpy and phen afforded crystalline [Mn(acac)2(bpy)] and [Mn(acac)2(phen)], respectively. The X-ray structural analysis of [Mn(acac)2(phen)] showed that the compound crystallised in orthorhombic space groupPbcn. The structure consists of a pseudooctahedral Mn(II) ion being bound to two acac−(C5H5O
2
−
) and a phen ligand with the molecule lying on two-fold axis.
Reactivity profiles of two new chromium(VI) reagents viz., pyridinium fluorochromate, C5H5NH[CrO3F] (PFC), and quinolinium fluorochromate C9H7NH [CrO3F] (QFC), have been presented. The compounds are capable of acting as both electron-transfer and oxygen-atom-transfer agents.
The X-ray analysis of PFC crystals reveals that the compound crystallises in the orthorhombic space group CmcZ1. The structure consists of discrete pyridinium cations and CrO3 F anions with no significant hydrogen bonding. This results in total disorder of the pyridinium cation. The tetrahedral [CrO3 F]− ion lies on a crystallographic mirror plane. 相似文献