Results 21 to 30 of about 1,333 (175)

A Mechanical Planar Chiral Rotaxane Induces Single‐Handed Helicity in a Twisted Perylene Diimide

Angewandte Chemie, EarlyView.
A mechanical planar chiral rotaxane (Rmp) is used to induce single‐handed helical chirality (M) in a perylene diimide chromophore, resulting in persistent circular dichroism (CD) and circularly polarised luminescence (CPL). ABSTRACT The twisting of chromophores such as perylene diimides (PDIs) into helical structures affords chiroptical properties from
Thomas E. Lawson, Denis Hartmann, Artemijs Krimovs, Qilong Sun, Robert Pal, Timothy A. Barendt   +5 more
wiley   +2 more sources

Pillar[5]arene Based [1]rotaxane Systems With Redox-Responsive Host-Guest Property: Design, Synthesis and the Key Role of Chain Length

Frontiers in Chemistry, 2019
Pillar[n]arenes are a new type of macrocyclic compounds, which were first reported in 2008 by Ogoshi. They not only have cylindrical, symmetrical, and rigid structures, but also have many advantages, including easy functionalization and rich host-guest ...
Runmiao Zhang, Runmiao Zhang, Chenwei Wang, Renhua Long, Tingting Chen, Chaoguo Yan, Yong Yao   +6 more
doaj   +1 more source

Impact of Threading State on the Mechanics of γ‐Cyclodextrin–Pyrene Gels

Angewandte Chemie, EarlyView.
Tuning the threading state of discrete γ‐cyclodextrin (γ‐CD)–pyrene pseudorotaxane crosslinkers controls gel topology and ring mobility. The resulting doubly threaded slide‐ring networks exhibit solvent‐switchable dissipative dynamics, high extensibility, rate‐dependent mechanics, and low hysteresis, revealing how crosslink topology governs macroscopic
Jongwon Oh, Heyi Liang, Natsumi Nitta, Jongmin Kim, Yuan Tian, Guancen Liu, Jerald E. Hertzog, Juan J. de Pablo, Stuart J. Rowan   +8 more
wiley   +2 more sources

A Mechanical sp2‐Jail for C60 Fullerene

Angewandte Chemie, EarlyView.
A rigid bisporphyrin receptor with an exceptionally compact 3D cavity functions as a molecular “mechanical jail”, tightly enclosing C60 fullerene. Near‐perfect shape complementarity affords ultrahigh binding affinity while imposing a large kinetic barrier for guest exchange, rendering encapsulation effectively irreversible under ambient conditions ...
A. Priscila Gia, Fernando G. Guijarro, Pau Armada, Daniel Aranda, Josefina Perles, Enrique Ortí, Juan Aragó, David González‐Rodríguez, Alberto de Juan   +8 more
wiley   +2 more sources

Chirality in rotaxanes and catenanes

Chemical Society Reviews, 2018
We discuss the stereogenic units that have been investigated in interlocked molecules, their application, absolute stereochemistry and propose future directions.
E. M. G. Jamieson, F. Modicom, S. M. Goldup   +2 more
openaire   +3 more sources

Supramolecular Mechanophore Additives Enable Mechanochromic Hydrogels

Angewandte Chemie, EarlyView.
A supramolecular loop‐forming mechanophore featuring a quencher and an emitter is incorporated as a water‐soluble macromolecular additive into hydrogels. In the stress‐free state, intramolecular charge‐transfer interactions fold the loop and quench fluorescence.
Iulia Scarlat, Jess M. Clough, Christoph Weder   +2 more
wiley   +2 more sources

Cyclodextrin–Amphiphilic Copolymer Supramolecular Assemblies for the Ocular Delivery of Natamycin

Nanomaterials, 2019
Natamycin is the only drug approved for fungal keratitis treatment, but its low water solubility and low ocular penetration limit its efficacy. The purpose of this study was to overcome these limitations by encapsulating the drug in single or mixed ...
Blanca Lorenzo-Veiga, Hakon Hrafn Sigurdsson, Thorsteinn Loftsson, Carmen Alvarez-Lorenzo   +3 more
doaj   +1 more source

Force‐Induced Control of Circularly Polarized Luminescence With Rotaxane Architecture

Angewandte Chemie, EarlyView.
Force‐induced reversible on/off switching of circularly polarized luminescence is achieved with a rotaxane‐based supramolecular mechanophore. The mechanophore, featuring a chiral helicene luminophore, is incorporated as a first network cross‐linker into a double‐network organogel.
Keigo Nonaka, Takumi Kuroda, Kota Masuda, Toshiki Nishitani, Masaki Enokido, Makoto Tsurui, Yuichi Kitagawa, Yasuchika Hasegawa, Keiichi Noguchi, Koji Nakano, Yoshimitsu Sagara   +10 more
wiley   +2 more sources

BINOL as a chiral element in mechanically interlocked molecules

Beilstein Journal of Organic Chemistry, 2022
In this minireview we present the use of the axially chiral 1,1'-binaphthyl-2,2'-diol (BINOL) unit as a stereogenic element in mechanically interlocked molecules (MIMs).
Matthias Krajnc, Jochen Niemeyer
doaj   +1 more source

Photochromic rotaxanes and pseudorotaxanes

Photochemical & Photobiological Sciences, 2019
Among stimulus-responsive molecular ring-on-thread rotaxanes and pseudorotaxanes, variants incorporating photochromic sub-units are attracting considerable attention as their properties and structure can be remotely and precisely controlled, additionally without producing chemical waste. The focus herein is on photoswitching-driven assembly/disassembly
Shilin, Yu, Nathan D, McClenaghan, Jean-Luc, Pozzo   +2 more
openaire   +2 more sources