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Artificial Molecular Machines.

Erbas-Cakmak S, Leigh DA, McTernan CT, Nussbaumer AL - Chem. Rev. (2015)

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Affiliation: School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom.

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bonded molecules and on catenanes and rotaxanes in which switching of other protic solvents... This effect (listed in descending binding ability) stations on the thread, macrocycle In these systems, fast-responding reporters are preferred... practical applications by utilizing molecular scale changes to create macroscopic effects... The thread of these rotaxanes included an anthracene fluorophore similar application in synthetic polymers often furnishes a useful result... of Brownian motion can be exploited to great effect in the synthesis every aspect of functional molecule and materials design... An improved robotics” in which ratcheted motions of molecular components

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(a) Chemicalstructures of rotaxane initiators 152 and 153 and the corresponding PMMA-based polymers 154, 155, and 155·2H2+. (b) Images obtainedby casting films of polymer 154 on quartz slides, thencovering the films with aluminum masks and exposing the unmasked areato DMSO vapor for 5 min. The photographs were taken while illuminatingthe slides with an 8-W UV lamp (254–350 nm). Reprinted withpermission from ref (1536). Copyright 2005 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
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fig63: (a) Chemicalstructures of rotaxane initiators 152 and 153 and the corresponding PMMA-based polymers 154, 155, and 155·2H2+. (b) Images obtainedby casting films of polymer 154 on quartz slides, thencovering the films with aluminum masks and exposing the unmasked areato DMSO vapor for 5 min. The photographs were taken while illuminatingthe slides with an 8-W UV lamp (254–350 nm). Reprinted withpermission from ref (1536). Copyright 2005 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

Mentions: Leighet al. used [2]rotaxanes to control fluorescence by distance-dependentintercomponent electron transfer both in solution and on a polymerfilm. The thread of these rotaxanes included an anthracene fluorophoreas a stopper attached to a glycylglycine hydrogen-bonding stationand a C11 alkyl chain that could act as a second station.The macrocycles in 152 and 153·2H2+ contained nitrophenyl and pyridiniummoieties, respectively, which are known to quench the fluorescenceby distance-dependent electron transfer. Macrocyclic shuttling couldbe induced by changes in solvent with strongly hydrogen-bonding solventsdisplacing the macrocycle from the glycylglycine station to the alkylthread. In non-hydrogen-bonding solvents (e.g., benzene, CH2Cl2, CH3CN), the macrocycle was located onthe glycylglycine station and fluorescence was completely quenched.In strongly hydrogen-bonding solvents (e.g., DMSO and NH2CHO), the macrocycle encapsulated the alkyl chain and fluorescencewas restored. Polymer/rotaxane hybrids were used to prepare transparentfilms on quartz slides. Initially, no fluorescence was detected whenthe slides coated with a 154 containing film were illuminatedwith UV light (254–350 nm). However, after the slides wereexposed to DMSO vapor, prior to illumination, a characteristic bluefluorescence was observed showing that similar shuttling processeswere occurring on the polymer film as were observed in solution. Maskingregions of the film from the DMSO vapor allowed the transitory etchingof patterns on the polymeric films (Figure 63).1536


Artificial Molecular Machines.

Erbas-Cakmak S, Leigh DA, McTernan CT, Nussbaumer AL - Chem. Rev. (2015)

(a) Chemicalstructures of rotaxane initiators 152 and 153 and the corresponding PMMA-based polymers 154, 155, and 155·2H2+. (b) Images obtainedby casting films of polymer 154 on quartz slides, thencovering the films with aluminum masks and exposing the unmasked areato DMSO vapor for 5 min. The photographs were taken while illuminatingthe slides with an 8-W UV lamp (254–350 nm). Reprinted withpermission from ref (1536). Copyright 2005 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
© Copyright Policy
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4585175&req=5

fig63: (a) Chemicalstructures of rotaxane initiators 152 and 153 and the corresponding PMMA-based polymers 154, 155, and 155·2H2+. (b) Images obtainedby casting films of polymer 154 on quartz slides, thencovering the films with aluminum masks and exposing the unmasked areato DMSO vapor for 5 min. The photographs were taken while illuminatingthe slides with an 8-W UV lamp (254–350 nm). Reprinted withpermission from ref (1536). Copyright 2005 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Mentions: Leighet al. used [2]rotaxanes to control fluorescence by distance-dependentintercomponent electron transfer both in solution and on a polymerfilm. The thread of these rotaxanes included an anthracene fluorophoreas a stopper attached to a glycylglycine hydrogen-bonding stationand a C11 alkyl chain that could act as a second station.The macrocycles in 152 and 153·2H2+ contained nitrophenyl and pyridiniummoieties, respectively, which are known to quench the fluorescenceby distance-dependent electron transfer. Macrocyclic shuttling couldbe induced by changes in solvent with strongly hydrogen-bonding solventsdisplacing the macrocycle from the glycylglycine station to the alkylthread. In non-hydrogen-bonding solvents (e.g., benzene, CH2Cl2, CH3CN), the macrocycle was located onthe glycylglycine station and fluorescence was completely quenched.In strongly hydrogen-bonding solvents (e.g., DMSO and NH2CHO), the macrocycle encapsulated the alkyl chain and fluorescencewas restored. Polymer/rotaxane hybrids were used to prepare transparentfilms on quartz slides. Initially, no fluorescence was detected whenthe slides coated with a 154 containing film were illuminatedwith UV light (254–350 nm). However, after the slides wereexposed to DMSO vapor, prior to illumination, a characteristic bluefluorescence was observed showing that similar shuttling processeswere occurring on the polymer film as were observed in solution. Maskingregions of the film from the DMSO vapor allowed the transitory etchingof patterns on the polymeric films (Figure 63).1536

View Article: PubMed Central - PubMed

Affiliation: School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom.

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

bonded molecules and on catenanes and rotaxanes in which switching of other protic solvents... This effect (listed in descending binding ability) stations on the thread, macrocycle In these systems, fast-responding reporters are preferred... practical applications by utilizing molecular scale changes to create macroscopic effects... The thread of these rotaxanes included an anthracene fluorophore similar application in synthetic polymers often furnishes a useful result... of Brownian motion can be exploited to great effect in the synthesis every aspect of functional molecule and materials design... An improved robotics” in which ratcheted motions of molecular components

No MeSH data available.