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sites anchored at the calix[6]arene platform and its ability to behave as a wheel for pseudorotaxanes and rotaxanes remains unexplored. Figure 1. Schematic representation of the interwoven structures formed between tris- and bis-(N-phenylureido) calix[6]arene derivatives, TPU and DPU, respectively, and viologen salts.

Ion-pair recognition of metal salts by pillararenes has never been reported. This limits the further development and applications of pillararene supramolecular chemistry. Herein we report the first examples of pillararene-based metal ion-pair recognition. They are host–guest complexes between three peralkylated pillar[5]arenes and the silver salt …

Methoxy-prism[5]arene PrS[5]Me is demethylated by a supramolecularly assisted reaction. In the presence of a tetramethylammonium cation, PrS[5]Me is demethylated by BBr3 in high yield, while in its absence a 55/40 mixture of PrS[5]OH/PrS[6]OH is formed. The dealkylation of prismarenes, such as PrS[6]R (R = Et, nPr) and c-PrS[5]Me, can be easily …

A pillar[5]arene derivative with a hydrophilic sulfonic group, i.e., monosulfonicpillar[5]arene (MSP5), has been successfully synthesized for the first time, which exhibited strong binding ...

In this work, we designed a new pillar[5]arene-based molecular machine responsive to the polarity of different solvents, which can exist in an interlocked structure in CDCl 3 and CD 3 OD, and can exist in an extended form in DMSO and was studied by 1 H and 2D NMR spectroscopy, HR(MS) and fluorescence spectroscopy.

A threading and stoppering approach has been taken to assemble the rotaxanes reported in this thesis. By doing so, the number of components required to synthesise a rotaxane is three: a pillar [5]arene macrocycle, an axle and a stopper group. By swapping out components, a toolkit can be adopted to fabricate rotaxanes in order to be ...

To investigate the dynamic stereochemical inversion behavior of pillar[5]arenes (P[5]s) in more detail, we synthesized a series of novel rim-differentiated P[5]s with various substituents and examined their rapid rotations by variable-temperature NMR (203–298 K). These studies revealed for the first time the barrier of "methyl-through-the-annulus" …

2D NOESY Studies. The formation of [1]rotaxane was then confirmed by 2D Nuclear Overhauser Effect Spectroscopy (NOESY). Here we also take P[5] 4 R as the model compound. As shown in Figure 2, the hydrogens of the alkyl chain on P[5] 4 R were close to the pillar[5]arene platform because H 1−4 showed strong correlation with H a and H b, …

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1 Introduction. Iptycenes are a class of aromatic compounds with arene units fused to bicyclo [2.2.2]octatriene bridgehead system. The first and simplest member of this family, triptycene was obtained by Bartlett et al. [ 1] in 1942. In the next 40 years, iptycene chemistry had not attracted much attention, and the studies almost focused on the ...

In this work, we designed a new pillar[5]arene-based molecular machine responsive to the polarity of different solvents which can exist in an interlocked structure in CDCl3 and CD3OD, and can...

IntroductionFrom Self-Assembling [2]Catenanes to Electronic DevicesA Hybrid [2]Catenane SwitchA Self-Complexing Molecular SwitchPseudorotaxane-Based Supramolecular Machines[2]Rotaxanes and ...

This review summarizes the recent progress of pillar [n]arene-based porous materials in the assembly of pillar [n]arenes on inorganic surfaces, one-dimensional …

The development of an efficient synthetic route toward rim-differentiated C5-symmetric pillar[5]arenes (P[5]s), whose two rims are decorated with different chemical functionalities, opens up successive transformations of this macrocyclic scaffold. This paper describes a gram-scale synthesis of a C5-symmetric penta-hydroxy P[5] precursor, and a …

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Calixarenes represent a fascinating class of macrocycles with several applications in supramolecular chemistry such as synthetic receptors for ion recognition, prototypes of molecular machines and devices and catalysts. In this scenario, larger calix[6]- and calix[8]arenes represent a modular platform to build novel and more efficient …

Request PDF | Molecular Switches and Machines Using Arene Building Blocks | IntroductionFrom Self-Assembling [2]Catenanes to Electronic DevicesA Hybrid [2]Catenane SwitchA Self-Complexing ...

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Calixarenes represent a fascinating class of macrocycles with several applications in supramolecular chemistry such as synthetic receptors for ion recognition, prototypes of molecular machines and devices and catalysts. In this scenario, larger calix [6]- and calix [8]arenes represent a modular platform to build novel and more efficient ...

This thesis aims to bridge the gap between pillararene based MIMs and their corresponding machine-like behaviour. On the nanoscale, molecules are constantly in …

The 1 H NMR spectra gave the useful information about the interlocked molecular structures of the prepared pillar[5]arene-terpyridnes. In the 1 H NMR spectrum of pillar[5]arene-terpyridine 3a in CDCl 3, the methylene unit (OCH 2 CO) and ethylenediamido unit (NHCH 2 CH 2 NH) displayed normal absorptions in the range of 4.37-3.58 ppm. …

Arene is designed to maximize the value of software. Through abstracted APIs, architected software layers and advanced testing protocols, Arene-developed applications are both …

JP Balancer propose une solution d'équilibrage complète pour les arbres à cardans, y compris une machine à équilibrer à roulements rigides et souples, pouvant être utilisée …

Permethylated pillar[5]arene 1 is soluble in organic solvents including chloroform, acetone, acetonitrile, THF, DMF and DMSO, whereas perhydroxylated pillar[5]arene 6 is soluble in acetone, acetonitrile, THF, methanol, DMF, DMSO and a basic aqueous solution. The deprotection of methoxy-substituents increases the polarity of …

Patel, Arjun (2021) Pillar[5]arene based molecular machines. PhD thesis, University of Nottingham. PDF (Thesis - as examined) - Repository staff only until 31 July 2023.

Download Citation | Pillar[5]arene based molecular machines | Scientists have been trying to shrink large scale technologies into smaller, molecular scales. One such pursuit is that of molecular ...

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