Search results for "molecular switch"

showing 3 items of 23 documents

Expansion and Compression of a Helicate with Central Diol-Units as Stereocontrolling Moieties

2022

The dicatechol ester ligand 2-H4 forms the compressed helicate Li4[(2)3Ti2] which upon removal of the internally bound lithium cations expands. In the compressed form, the chiral diol units control the stereochemistry of the complex which is lost upon expansion of the system. peerReviewed

helicatelitiumstereochemistrykationitsupramolekulaarinen kemiamolekyylitnanotekniikkaself-assemblykompleksiyhdisteetmetallitmolecular switch
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Anion Responsive Molecular Switch Based on a Doubly‐Strapped Calix[4]pyrrole

2022

A calix[4]pyrrole receptor bearing two proximally meso - meso linking isophthaloyl straps displays open and closed states depending on the calix[4]pyrrole conformation. In the crystal structures and in non-polar solvent, the calix[4]pyrrole adopts open 1,3-alternate conformation with straps on the sides. Anion binding triggers a closed state of the receptor providing two types of interactions with an aromatic benzoate guest: hydrogen bonds from the pyrrolic groups and π ··· π interactions from the phenyl groups of the straps. Slow exchange dynamics was observed on the NMR timescale indicating that benzoate, acetate and chloride anions, which bind with relatively low affinity get kinetically…

kemialliset sidoksetNMR spectroscopyvetysidoksetanionitcalix[4]pyrrolessupramolekulaarinen kemiaNMR-spektroskopiaheterosykliset yhdisteetanionssupramolecular chemistrymolecular switch
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Design, Synthesis and Characterization of a Visible-Light-Sensitive Molecular Switch and Its PEGylation Towards a Self-Assembling Molecule.

2022

HBDI-like chromophores represent a novel set of biomimetic switches mimicking the fluorophore of the green fluorescent protein that are currently studied with the hope to expand the molecular switch/motor toolbox. However, until now members capable of absorbing visible light in their neutral (i. e. non-anionic) form have not been reported. In this contribution we report the preparation of an HBDI-like chromophore based on a 3-phenylbenzofulvene scaffold capable of absorbing blue light and photoisomerizing on the picosecond timescale. More specifically, we show that double-bond photoisomerization occurs in both the E-to-Z and Z-to-E directions and that these can be controlled by irradiating …

light-driven molecular switchesnanoaggregatesHBDI-like chromophores; light-driven molecular switches; light-sensitive molecules; nanoaggregates; photoswitches; self-assembling molecules; Green Fluorescent Proteins; LightLightOrganic ChemistryGreen Fluorescent ProteinsHBDI-like chromophoresself-assembling moleculesGeneral Chemistrylight-sensitive moleculesCatalysisphotoswitchesChemistry (Weinheim an der Bergstrasse, Germany)
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