Molecular Switches and Motors on Surfaces

Pathem, Bala Krishna; Claridge, Shelley A.; Yong, Zheng; Weiss, Paul S.

doi:10.1146/annurev-physchem-040412-110045

Cited by 119 publications

(129 citation statements)

References 175 publications

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“…[158][159][160] Within SAMs, intermolecular distances, molecular orientation, and substrate-molecule interactions strongly influence whether assembled switches and rotors retain their functionality due to the varied chemistries of their interfaces. 161,162 Physically and electronically decoupling these functional moieties from surfaces or from neighboring molecules is often necessary to avoid steric constraints or quenching of excited states. [163][164][165][166][167][168] For example, molecular rotors can be tethered such that the axis of rotation is aligned parallel or perpendicular to the surface, in either altitudinal or azimuthal orientations, respectively.…”

Section: Acs Nanomentioning

confidence: 99%

Controlling Motion at the Nanoscale: Rise of the Molecular Machines

et al. 2015

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As our understanding and control of intra- and intermolecular interactions evolve, ever more complex molecular systems are synthesized and assembled that are capable of performing work or completing sophisticated tasks at the molecular scale. Commonly referred to as molecular machines, these dynamic systems comprise an astonishingly diverse class of motifs and are designed to respond to a plethora of actuation stimuli. In this Review, we outline the conditions that distinguish simple switches and rotors from machines and draw from a variety of fields to highlight some of the most exciting recent examples of opportunities for driven molecular mechanics. Emphasis is placed on the need for controllable and hierarchical assembly of these molecular components to display measurable effects at the micro-, meso-, and macroscales. As in Nature, this strategy will lead to dramatic amplification of the work performed via the collective action of many machines organized in linear chains, on functionalized surfaces, or in three-dimensional assemblies.

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Section: Acs Nanomentioning

confidence: 99%

Controlling Motion at the Nanoscale: Rise of the Molecular Machines

et al. 2015

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“…97 Again, values and relative order depend on the specific backbones and electrodes, as band alignment effects dominate. 209 …”

Section: Zero-dimensional Assembliesmentioning

confidence: 99%

“…For instance, azobenzene switching on surfaces can be initiated using electric fields or tunneling electrons from a STM probe tip. 209 …”

Section: Zero-dimensional Assembliesmentioning

confidence: 99%

From the bottom up: dimensional control and characterization in molecular monolayers

et al. 2013

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Self-assembled monolayers are a unique class of nanostructured materials, with properties determined by their molecular lattice structures, as well as the interfaces with their substrates and environments. As with other nanostructured materials, defects and dimensionality play important roles in the physical, chemical, and biological properties of the monolayers. In this review, we discuss monolayer structures ranging from surfaces (two-dimensional) down to single molecules (zero-dimensional), with a focus on applications of each type of structure, and on techniques that enable characterization of monolayer physical properties down to the single-molecule scale.

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“…Isolating single molecular switches within the welldefined SAMs of structural molecules as matrices (e.g., alkanethiols) has proved to be an effective approach towards reducing the physical hindrance [110][111][112][113][114][115]. These isolated single molecular switches, which we refer to as 0D molecules, are well separated from each other with their functional groups protruding above the SAM matrices and have very limited interactions with other molecular switches and matrix molecules, leading to the enhanced switching efficiency and kinetics.…”

Section: Zero-dimensional Functional Moleculesmentioning

confidence: 99%

Active molecular plasmonics: tuning surface plasmon resonances by exploiting molecular dimensions

et al. 2015

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Molecular plasmonics explores and exploits the molecule-plasmon interactions on metal nanostructures to harness light at the nanoscale for nanophotonic spectroscopy and devices. With the functional molecules and polymers that change their structural, electrical, and/or optical properties in response to external stimuli such as electric fields and light, one can dynamically tune the plasmonic properties for enhanced or new applications, leading to a new research area known as active molecular plasmonics (AMP). Recent progress in molecular design, tailored synthesis, and self-assembly has enabled a variety of scenarios of plasmonic tuning for a broad range of AMP applications. Dimension (i.e., zero-, two-, and threedimensional) of the molecules on metal nanostructures has proved to be an effective indicator for defining the specific scenarios. In this review article, we focus on structuring the field of AMP based on the dimension of molecules and discussing the state of the art of AMP. Our perspective on the upcoming challenges and opportunities in the emerging field of AMP is also included.

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Molecular Switches and Motors on Surfaces

Cited by 119 publications

References 175 publications

Controlling Motion at the Nanoscale: Rise of the Molecular Machines

Controlling Motion at the Nanoscale: Rise of the Molecular Machines

From the bottom up: dimensional control and characterization in molecular monolayers

Active molecular plasmonics: tuning surface plasmon resonances by exploiting molecular dimensions

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