Disperse and disordered: a mexylaminotriazine-substituted azobenzene derivative with superior glass and surface relief grating formation

Kirby, Robert E.; Sabat, Ribal Georges; Nunzi, Jean‐Michel; Lebel, Olivier

doi:10.1039/c3tc32034k

Cited by 72 publications

(81 citation statements)

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“…These materials form surface relief gratings (SRGs) efficiently under illumination of a light interference pattern at ambient temperature, well below their T g . 15,21,23 To distinguish the behavior of the different chemical groups in these molecules, a color code is used throughout this article, where red refers to the azo moiety, grey to the spacer, and blue to the backbone parts of the molecules. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 1 also shows that the UV-visible absorbance spectra of thin films of pDR1A and gDR1 are comparable both in terms of close absorption maxima (445 and 463 nm, respectively) and in terms of the asymmetric shape of the absorption band related to enhanced dipole-dipole interactions between adjacent DR1 units in the solid state.…”

Section: Resultsmentioning

confidence: 99%

Submolecular Plasticization Induced by Photons in Azobenzene Materials

et al. 2015

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We demonstrate experimentally for the first time that the illumination of azobenzene derivatives leads to changes in molecular environment similar to those observed on heating but that are highly heterogeneous at the submolecular scale. This localized photoplasticization, which can be associated with a free volume gradient, helps to understand the puzzling phenomenon of photoinduced macroscopic material flow and photoexpansion upon illumination far below the glass transition temperature (T(g)). The findings stem from the correlation of infrared (IR) spectral band shifts measured upon illumination with those measured at controlled temperatures for two amorphous DR1-functionalized azo derivatives, a polymer, pDR1A, and a molecular glass, gDR1. This new approach reveals that IR spectroscopy can be used as an efficient label-free molecular-scale thermometer that allows the assignment of an effective temperature (T(eff)) to each moiety in these compounds when irradiated. While no band shift is observed upon illumination for the vibrational modes assigned to backbone moieties of pDR1A and gDR1 and a small band shift is found for the spacer moiety, dramatic band shifts are recorded for the azo moiety, corresponding to an increase in T(eff) of up to nearly 200 °C and a molecular environment that is equivalent to thermal heating well above the bulk T(g) of the material. An irradiated azo-containing material thus combines characteristic properties of amorphous materials both below and above its bulk T(g). The direct measurement of T(eff) is a powerful probe of the local environment at the submolecular scale, paving the way toward better rationalization of photoexpansion and the athermal malleability of azo-containing materials upon illumination below their T(g).

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Section: Resultsmentioning

confidence: 99%

Submolecular Plasticization Induced by Photons in Azobenzene Materials

et al. 2015

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“…Стеклообразные слои на основе производного меток-сиаминотриазин замещенного азобензола XXXVI обес-печивают регистрацию термически стабильных гологра-фических решеток с η > 45% [140]. Рельеф поляризационных голографических решеток, зарегистрированных в слоях полимера XXXIX, превы-шал в 3 раза толщину полимерного слоя [146].…”

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Современное Состояние Разработки Светочувствительных Сред Для Голографии (Обзор)

Барачевский¹

2018

Журнал Технической Физики

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“…[20][21][22][23][24] In this paper, we studied the film growth and surface patterning of mexylaminotriazine glasses. 31 Moreover, these materials can be readily deposited from solution from various solvents to generate amorphous thin films in their vitreous phase. 25 Hydrogen bonding between triazine units has been revealed to exist in the glassy state, the resulting supramolecular aggregates frustrating the molecular reorganization required for crystallization.…”

Section: Introductionmentioning

confidence: 99%

Water-triggered spontaneous surface patterning in thin films of mexylaminotriazine molecular glasses

et al. 2015

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Surface patterning that occurs spontaneously during the formation of a thin film is a powerful tool for controlling film morphology at the nanoscale level because it avoids the need for further processing. However, one must first learn under which conditions these patterning phenomena occur or not, and how to achieve control over the surface morphologies that are generated. Mexylaminotriazine-based molecular glasses are small molecules that can readily form amorphous thin films. It was discovered that this class of materials can either form smooth films, or films exhibiting either dome or pore patterns. Depending on the conditions, these patterns can be selectively obtained during film deposition by spin-coating. It was determined that this behavior is controlled by the presence of water or, more generally, of a solvent in which the compounds are insoluble, and that the relative amount and volatility of this poor solvent determines which type of surface relief is obtained. Moreover, AFM and FT-IR spectroscopy have revealed that the thin films are amorphous independently of surface morphology, and no difference was observed at the molecular or supramolecular level. These findings make this class of materials and this patterning approach in general extremely appealing for the control of surface morphology with organic nanostructures.

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Disperse and disordered: a mexylaminotriazine-substituted azobenzene derivative with superior glass and surface relief grating formation

Cited by 72 publications

References 35 publications

Submolecular Plasticization Induced by Photons in Azobenzene Materials

Submolecular Plasticization Induced by Photons in Azobenzene Materials

Современное Состояние Разработки Светочувствительных Сред Для Голографии (Обзор)

Water-triggered spontaneous surface patterning in thin films of mexylaminotriazine molecular glasses

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