Photo-controllable electronic switches based on azopyridine derivatives

García-Amorós, Jaume; Gómez, Elvira; Vallés, E.; Velasco, Dolores

doi:10.1039/c2cc34457b

Cited by 15 publications

(9 citation statements)

References 19 publications

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“…In addition, the initial trans form can be regenerated thermally in the dark. 2 This photochemical signature has been widely exploited for many applications within not only materials science [3][4][5][6][7][8][9][10] but also biology and medicine. [11][12][13][14][15][16][17] Main characteristic parameters and abilities of azobenzenebased photoactive materials are directly related to the rate of the thermally-activated cis-to-trans isomerisation of the azo dye used which, in turn, is determined mainly by its molecular architecture.…”

Section: Introductionmentioning

confidence: 99%

Understanding the fast thermal isomerisation of azophenols in glassy and liquid-crystalline polymers

García-Amorós

Velasco

2014

Phys. Chem. Chem. Phys.

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The good solubility of azophenols in low molar mass liquid crystals together with the ability of their related polymers to form homogeneous nematic and glassy thin films make such azoderivatives valuable chromophores to get a great variety of photoactivatable systems with fast switching speeds under ambient conditions. In fact, the final applicability of these systems is mainly determined by the thermal cis-to-trans isomerisation rate of the photoactive azophenol used, in other words, by the intimate mechanism the reaction goes through. The kinetico-mechanistic study reported herein shows that the rate of the thermal back reaction for azophenols is very sensitive to the local environment where the azo chromophore is located, mainly to its capability to establish hydrogen bonding with its surroundings. With a proper design, azophenol-based polymers can exhibit thermal isomerisation rates as fast as those of the monomers in solution even without the presence of any solvent.

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Section: Introductionmentioning

confidence: 99%

Understanding the fast thermal isomerisation of azophenols in glassy and liquid-crystalline polymers

García-Amorós

Velasco

2014

Phys. Chem. Chem. Phys.

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“…In this perspective, there is no need of an erasing wavelength, whereas the readout must be performed during the lifetime of the metastable state. These requirements are fulfilled by a vast variety of systems, particularly azobenzenes and related compounds [6][7][8][9][10] that display a great light stability and allow many excitation cycles. Nonetheless, readout is also a concern in these systems.…”

Section: Introductionmentioning

confidence: 99%

Chiral power change upon photoisomerization in twisted nematic liquid crystals

Simoncelli

Aramendı́a

2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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In this work, we use the photoisomerization of azobenzenes, a phenanthrospirooxazine, and a fulgide in a twisted nematic liquid crystalline phase to change the chiral twisting power of the system. The changes are probed by the rotatory power of linearly polarized light. Time resolved and steady state experiments are carried out. The chiral change and the photoisomerization process have similar characteristic recovery times and activation energy, thus probing that the change is induced by the modification in the chemical composition of the photochromic dopant system. The amplitude of the light twisting power change correlates with the order change in the liquid crystal (LC) but not with the modification in the absorption characteristics of the system. This indicates that the driving force of the chiral change is the microscopic order modification in the LC phase that affects the helical pitch of the phase.

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“…Molecular switches are molecular devices that shi reversibly between two or more stable states in response to environmental changes. [1][2][3][4][5][6] As a result, the system alters some of its properties like its uorescence emission, [7][8][9][10] electrical conductivity [11][12][13][14][15][16] or macroscopic dimensions. [17][18][19][20][21][22][23] Such variations can be detected and further transduced to an on/off response, enabling the system to act as an information transmitter or recorder at the molecular level.…”

Section: Introductionmentioning

confidence: 99%