Porphyrin Clips Derived from Diphenylglycoluril. Synthesis, Conformational Analysis, and Binding Properties
摘要:
With the aim to construct synthetic systems that function according to the principles of enzymes, molecular clips based on diphenylglycoluril were covalently attached to (metallo)porphyrins. Two different porphyrin clips, 1 and 2, were synthesized that differ in the length and position of the linker between the clip and the porphyrin. This resulted in a great difference in flexibility of the cavity molecules, which had remarkable consequences for their binding properties in organic solution. The physical properties of the free base and zinc porphyrin clips have been studied in detail with NMR techniques and by the host-guest binding of viologen, dihydroxybenzene, and pyridine derivatives.
4.0×105 M−1) in acetone. In the solid state the cryptand forms a 2:1 threaded structure with paraquat and an interesting supramolecular poly[2]pseudorotaxane threaded structure with a dihydroxyethyl-substituted paraquat derivative, respectively. It has been further used to prepare cryptand/paraquat derivative [2]rotaxanesefficiently by the immediate solvent evaporation method using easily available
一种新颖的双(米-亚苯基)为基础的-26冠-8穴状配体已被合成。它已被用来在丙酮中制备具有两个具有高缔合常数(6.5×10 5和4.0×10 5 M -1)的百草枯衍生物的两个1:1配合物。在固态下,穴状配体形成具有百草枯的2:1螺纹结构和具有二羟乙基取代的百草枯衍生物的有趣的超分子聚[2]假轮烷烷螺纹结构。通过使用容易获得的3,5-二甲基苯基作为终止剂的立即溶剂蒸发法,它还被用于有效地制备穴状/百草枯的衍生物[2]轮烷。
Guest-dependent complexation of triptycene-derived macrotricyclic host containing one anthracene moiety with paraquat derivatives: construction of [2]rotaxanes
作者:Ya-Kun Gu、Ying Han、Chuan-Feng Chen
DOI:10.1080/10610278.2014.976220
日期:2015.6.3
Complexation between the triptycene-derivedmacrotricyclicpolyether containing an anthracene unit and paraquat derivatives in both solution and solid state was investigated. It was found that the macrotricyclic host with multi-cavity structure could form a series of [2]pseudorotaxanes with different terminal functionalised paraquat derivatives in different threading modes, which subsequently resulted
receptor containing a pentiptycene unit and a benzene ring linked by two crown ether chains has been synthesized. It could form stable complexes with paraquatderivatives with different functional groups in solution and in the solid state. It was found that the complexes dissociated upon two one-electron reduction of the bipyridinium ring. Moreover, binding and release of the guest molecules could also
A novel bis(m-phenylene)-26-crown-8-based lariat ether (i.e., 3b) was synthesized and characterized. It can bind paraquat derivatives more strongly than bis(m-phenylene)-26-crown-8 in solution. It forms pseudorotaxanes with two paraquat derivatives in the solid state. N-Methyl substitution was found to play an important role on the binding strength of lariat ether 3b. Furthermore, due to the introduction
合成并表征了一种新型双(间亚苯基)-26-冠-8 基套索醚(即 3b)。在溶液中,它可以比双(间亚苯基)-26-crown-8 更强地结合百草枯衍生物。它与两种固态百草枯衍生物形成假轮烷。发现 N-甲基取代对套索醚 3b 的结合强度起重要作用。此外,由于引入了两个苄氧基,它与百草枯衍生物的结合可以通过添加 K +(然后是 dibenzo-18-crown-6)来关闭(然后重新打开),并且解离百分比取决于添加的 K + 离子。
Steric effects on complexation of bis(
<i>meta</i>
‐phenylene)‐32‐crown‐10 derivatives with paraquats
作者:Zhenbin Niu、Feihe Huang、Harry W. Gibson
DOI:10.1002/hc.21359
日期:2017.3
Novel 5,5′-disubstituted BMP32C10 derivatives bearing different sized substituents were designed and prepared. The stoichiometries and complexation behavior between these hosts and paraquats were studied. It was found that bulky 5,5′-substituents disfavor complexation with paraquats by hindering the formation of [2]pseudorotaxane and “taco” complexes.