The trans form of an azobenzene-containing guest can complex with a pillar[6]arene, while it cannot pillar[5]arenes due to the different cavity sizes pillar[6]arene and pillar[5]arenes. spontaneous aggregation its host-guest be reversibly photocontrolled by irradiation UV visible light, leading switch between irregular aggregates vesicle-like aggregates. This new pillar[6]arene-based photoresponsive recognition motif work in organic solvents is good supplement existing widely used...

The complexation between a water-soluble pillar[6]arene (WP6) and paraquat (G1) in water was investigated. They could form stable 1:1 [2]pseudorotaxane with an extremely high association constant of (1.02 ± 0.10) × 108 M–1 mainly driven by electrostatic interactions, hydrophobic π–π stacking interactions. This molecular recognition has not only binding strength but also pH-responsiveness. threading dethreading processes this be reversibly controlled changing the solution pH. novel motif...

The first water-soluble pillar[6]arene was synthesized. Its water solubility can be reversibly controlled by changing the pH. This control used in reversible transformations between nanotubes and vesicles dispersion of multiwalled carbon water.

A novel sugar-functionalized amphiphilic pillar[5]arene containing galactose groups as the hydrophlic part and alkyl chains hydrophobic was designed synthesized. It self-assembles in water to produce nanotubes confirmed by TEM, SEM, fluorescence microscopy. These nanotubes, showing low toxicity both cancer normal cells, can be utilized excellent cell glues agglutinate E. coli. The existence of galactoses on these provides multivalent ligands that have high affinity for carbohydrate receptors

Three copillar[5]arenes, pillar[5]arenes containing different repeating units, were successfully prepared by co-oligomerization of monomers. It was demonstrated that the yields pillararenes could be improved using hydroquinone diethers with appropriate aliphatic chain lengths. Pseudorotaxane-type threaded structures obtained in solid state inclusion an n-hexane molecule into cavity either a homopillar[5]arene, pillar[5]arene only one unit, or copillar[5]arene.

A solvent-driven doubly threaded rotaxane dimer based on an amino-modified copillar[5]arene was prepared using bis(trifluoromethyl)phenyl isocyanate as stoppers. By comparison of proton NMR spectra the and control compound, inclusion-induced shielding effects decyl protons dumbbell compound were estimated. From crystal structures previously reported analogous pillar[5]arene/alkane pseudorotaxanes, we know that four methylenes can be totally encapsulated in pillar[5]arene cavity. When a is...

By the introduction of trimethylammonium groups at both upper and lower rims, a cationic water-soluble pillar[5]arene was prepared, which forms stable 1 : host–guest complex with sodium 1-octanesulfonate in water.

DIBPillar[n]arenes (n = 5, 6) were synthesized. They showed different host−guest properties with n-octyltriethyl ammonium hexafluorophosphate G due to their cavity sizes. DIBpillar[5]arene no complexation G, while DIBpillar[6]arene formed a 1:1 complex an association constant of 334 (±24) M−1 in chloroform. In this letter, the first pillar[6]arene crystal structure and investigation chemistry pillar[6]arenes are reported.

A novel non-symmetric pillar[5]arene-based anion receptor containing multiple triazole anion-binding sites was designed and synthesized. It has high affinity selectivity for the fluoride anion.

Four constitutional isomers of BMpillar[5]arene were prepared from 1-butoxy-4-methoxybenzene and they showed different binding abilities with n-octyltrimethyl ammonium hexafluorophosphate.

Two new copillar[5]arenes were prepared. They are arranged in two completely different motifs, a cyclic dimer containing monomers with conformations that mirror images of each other and linear supramolecular polymers the solid state. Not only has it been shown to form this kind is unique feature associated pillar[5]arene macrocycles but also was demonstrated weak van der Waals forces can be used control self-organization during their polymerization process.

We demonstrate that n-octylethyl ammonium hexafluorophosphate (G) can thread through the cavity of 1,4-dimethoxypillar[5]arene to form a [2]pseudorotaxane with binding constant 1.09 (±0.31) × 10(3) M(-1) in chloroform. The formation this threaded structure has been confirmed by proton NMR spectroscopy, electrospray ionization mass spectrometry, and X-ray single crystal analysis. complexation between G chloroform be switched off adding Cl(-). For comparison, 1,4-bis(n-propoxy)pillar[5]arene...

The host−guest complex of dipropoxypillar[5]arene and an ionic liquid 1,3-dimethylimidazolium iodide is found to exhibit a lower critical solution temperature (LCST)-type phase transition in chloroform. This LCST-type behavior can be conveniently modulated by experimental parameters easily combined with the for potential application product educt separation.

A pillar[4]arene[1]quinone and a difunctionalized pillar[5]arene have been synthesized by partial oxidation.

A novel pH-responsive supramolecular polymer based on the pillar[5]arene/imidazolium cation recognition motif was successfully prepared. It demonstrated that binding strength between monomer molecules in solution could be reduced by adding base, thereby leading to a decrease polymerization degree, while reverse switch achieved addition of acid change back cationic state. These processes were confirmed 1H NMR, DOSY experiments, viscosity measurements and theoretical calculations. Moreover,...

Abstract The facile and efficient preparation of pillar[ n ]arenes ( = 5 or 6) was achieved by cyclooligomerization 2,5‐dialkoxybenzyl alcohols bromides with an appropriate Lewis acid catalyst at room temperature. mechanism for this is presumed to be a Friedel–Crafts alkylation.

Host–guest complexation between a novel difunctional pillar[5]arene-based host H and alkyldiamines was fully investigated in both solution the solid state. Proton transfer from carboxylic acid groups to amine units occurred principle by undergoing an acid–base reaction. Driven cooperativity of electrostatic interactions, multiple C–H···π H-bonds, guests penetrated into cavity form pseudorotaxane-type inclusion complexes with relatively high binding affinities.

A strategy for fluorescence turn-on detection of uric acid by<bold>CD-MONT-2</bold>with high selectivity and sensitivity, through host–guest interactions.

Abstract A pillar[5]arene[1]quinone and a difunctionalized pillar[6]arene were synthesized. Their application in host–guest chemistry was investigated by using 1‐adamantanylammonium tetrakis[3,5‐bis(trifluoromethyl)phenyl]borate ( 3 ), which possesses weakly coordinating counteranion, as model guest. These hosts showed different binding affinities for with association constants.

It was demonstrated that a novel [3]pseudorotaxane could be separated by column chromatography during the synthesis of copillar[5]arene. Single crystal X-ray analysis revealed this consisted copillar[5]arene and its monomer in molar ratio 2 : 1.

ACTA CHIMICA SINICA 1,4-双正丙氧基柱[7]芳烃的合成及主客体化学 韩成友 张子彬 池小东 张明明 喻国灿 黄飞鹤 * (浙江大学化学系 杭州 310027) 摘要 我们以 1,4-二正丙氧基-2,5-双甲氧甲基苯为原料用对甲苯磺酸为催化剂在二氯甲烷中制备了 1,4-双正丙氧基柱 [5]芳烃, 1,4-双正丙氧基柱[6]芳烃和 1,4-双正丙氧基柱[7]芳烃.我们用氢谱、碳谱和质谱对它们进行了表征. 它们有不 同的氢谱却有相似的碳谱.对比它们的空腔尺寸, 柱[5]的内径大约是 4.6 Å, 与葫芦脲[6]及 α-环糊精类似.柱[6]的内径 大约是 6.7 与葫芦脲[7]及 β-环糊精类似.柱[7]的内径大约是 8.7 与葫芦脲[8]及 γ-环糊精类似.我们用正辛基三 乙基六氟磷酸铵盐作为模型客体研究了它们之间的主客体络合.柱[5]与之有微弱的络合, 柱[6]显示了良好的络合, 而 柱[7]与之没有络合.

An AB-type heteroditopic monomer was prepared by incorporating a dialkylammonium salt into copillar[5]arene from the co-oligomerization of 1-(10-bromodecyloxy)-4-methoxybenzene and 1,4-dimethoxybenzene. Based on self-assembly this new in chloroform, linear supramolecular polymer formed. The formation characterized various techniques including 1H NMR, NOESY, DOSY, specific viscosity SEM. This anion responsive, since monomers could be destroyed addition chloride anions. study provides an...