Molecular Transmission: Controlling the Twist Sense of a Helical Polymer with a Single Light‐Driven Molecular Motor

Pijper, Dirk; Feringa, Ben L.

doi:10.1002/anie.200604941

Cited by 189 publications

(123 citation statements)

References 46 publications

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“…Theproduct, isolated in 52 %yield as aracemate, was subsequently stirred under reflux in ethanol with cis-[Ru(bpy) 2 Cl 2 ]. Counteranion exchange using ammonium hexafluorophosphate resulted in precipitation of [Ru(bpy) 2 -(L2)](PF 6 ) 2 ,which was collected by filtration (61 %) and used…”

Section: Osmentioning

confidence: 99%

“…Photoresponsive molecular switches and motors are emerging as fascinating tools for controlling the properties of smart materials, [1,2] as well as biological functions. [3] One of the major hurdles at present, however,isthat the molecules most widely applied, that is,a zobenzenes, [4] diarylethenes, [5] spiropyrans, [6] and overcrowded alkenes, [7] are typically operated with UV light.…”

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confidence: 99%

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Visible‐Light‐Driven Photoisomerization and Increased Rotation Speed of a Molecular Motor Acting as a Ligand in a Ruthenium(II) Complex

2015

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Toward the development of visible-light-driven molecular rotary motors, an overcrowded alkene-based ligand and the corresponding ruthenium(II) complex is presented. In our design, a 4,5-diazafluorenyl coordination motif is directly integrated into the motor function. The photochemical and thermal isomerization behavior has been studied by UV/Vis and NMR spectroscopy. Upon coordination to a Ru(II) bipyridine complex, the photoisomerization process can be driven by visible (λmax = 450 nm) instead of UV light and furthermore, a large increase of the speed of rotation is noted. DFT calculations point to a contraction of the diazafluorenyl lower half upon metal-coordination resulting in reduced steric hindrance in the "fjord region" of the molecule. Consequently, it is shown that metal-ligand interactions can play an important role in the adjustment of both photophysical and thermodynamic properties of molecular motors.

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Section: Osmentioning

confidence: 99%

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confidence: 99%

Visible‐Light‐Driven Photoisomerization and Increased Rotation Speed of a Molecular Motor Acting as a Ligand in a Ruthenium(II) Complex

2015

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“…83 For this purpose, a dynamic helical polymer, polyhexylisocyanate, was employed. An optically active amide-substituted trans motor 34 was used as an initiator in the polymerization of isocyanates, which resulted in a polymer showing random helicity (Figure 26).…”

Section: Motors On Surfaces and Molecular Transmissionmentioning

confidence: 99%

The Art of Building Small: From Molecular Switches to Molecular Motors

2007

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Molecular switches and motors are essential components of artificial molecular machines. In this perspective, we discuss progress in our design, synthesis, and functioning of photochemical and electrochemical switches and chemical and light-driven molecular motors. Special emphasis is given to the control of a range of functions and properties, including luminescence, self-assembly, motion, color, conductance, transport, and chirality. We will also discuss our efforts to control mechanical movement at the molecular level, a feature that is at the heart of molecular motors and machines. The anchoring of molecular motors on surfaces and molecular motors at work are discussed.

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“…However, it seems reasonable that, before artificial molecular machines can find applications in many fields of technology, they have to be interfaced with the macroscopic world by ordering them in some way so that they can behave coherently and can be addressed in space [96]. New generations of molecular machines and motors organized at interfaces [97], deposited on surfaces [98][99][100][101][102], embedded into liquid crystals [103][104][105] and polymers [106], or immobilized into membranes [107] or porous materials [23,108], have started to appear. On the basis of recent experiments [109,110] showing that the collective operation of machine-molecules in carefully engineered surface-deposited monolayers can indeed develop mechanical work at a larger scale, one can optimistically hope that useful devices based on artificial nanomachines will see the light in a not too distant future.…”

Section: Resultsmentioning

confidence: 99%

Molecular machines operated by light

Venturi

2008

Open Chemistry

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Abstract:The bottom-up construction and operation of machines and motors of molecular size is a topic of great interest in nanoscience, and a fascinating challenge of nanotechnology. Researchers in this field are stimulated and inspired by the outstanding progress of molecular biology that has begun to reveal the secrets of the natural nanomachines which constitute the material base of life. Like their macroscopic counterparts, nanoscale machines need energy to operate. Most molecular motors of the biological world are fueled by chemical reactions, but research in the last fifteen years has demonstrated that light energy can be used to power nanomachines by exploiting photochemical processes in appropriately designed artificial systems. As a matter of fact, light excitation exhibits several advantages with regard to the operation of the machine, and can also be used to monitor its state through spectroscopic methods. In this review we will illustrate the design principles at the basis of photochemically driven molecular machines, and we will describe a few examples based on rotaxane-type structures investigated in our laboratories. © Versita Warsaw and Springer-Verlag Berlin

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Molecular Transmission: Controlling the Twist Sense of a Helical Polymer with a Single Light‐Driven Molecular Motor

Abstract: Twisted sisters: Transmission of chirality from a light‐driven rotary molecular motor to the macromolecular level of a polyisocyanate allows fully reversible control of the preferred helical sense of the polymer backbone (see picture).

Cited by 189 publications

References 46 publications

Visible‐Light‐Driven Photoisomerization and Increased Rotation Speed of a Molecular Motor Acting as a Ligand in a Ruthenium(II) Complex

Visible‐Light‐Driven Photoisomerization and Increased Rotation Speed of a Molecular Motor Acting as a Ligand in a Ruthenium(II) Complex

The Art of Building Small: From Molecular Switches to Molecular Motors

Molecular machines operated by light

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