Versatile setup for optical spectroscopy under high pressure and low temperature

Tran, Michaël; Levallois, Julien; Akrap, Ana; Teyssier, J.; Kuzmenko, A. B.; Lévy-Bertrand, F.; Tediosi, Riccardo; Brandt, Mehdi; Lerch, Philippe; Marel, D. van der

doi:10.1063/1.4931990

Cited by 9 publications

(6 citation statements)

References 24 publications

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“…Indeed, we have checked the crystal structure of micro‐crystals (ground crystals) and single crystals are almost same solid‐state arrangements by PXRD and simulation pattern of SCXRD (Figure S1). Kerosene was used as a pressure transmitting medium, and all experiments were conducted at room temperature. As the applied pressure increased, the fluorescence emission of the 1 ⋅ guest clearly showed a gradual red shift, and the luminescence intensity gradually decreased (Figure a–c), which coincided with the previous results –,…”

Section: Figurementioning

confidence: 99%

Piezofluorochromism in Charge‐Transfer Inclusion Crystals: The Influence of High Pressure versus Mechanical Grinding

et al. 2018

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The distinct piezochromic luminescent responses of chargeÀtransfer inclusion crystals, which consist of small aromatic guest molecules with naphthalenediimide derivatives, are reported. Reversible multichromism is observed over the entire visible region in response to high pressure, whereas a weak response to mechanical grinding is evident. High-pressure single-crystal X-ray diffraction analysis and TD-DFT calculations clearly suggest that high compression induces a closer arrangement with a short interfacial distance between small aromatic guest molecules and naphthalenediimide derivatives, which is proposed as the origin of the drastic luminescent color change.The development of luminescent molecules that are sensitive to external stimuli has attracted considerable attention in recent years owing to their potential applications, such as in bioimaging, display, memory, and sensors. [1,2] Materials sensitive to external stimuli, such as pH, light, and temperature, have been relatively well investigated, whereas piezochromic luminescent materials, which change their luminescence upon mechanical grinding/shearing or high compression, remain poorly understood. Indeed, a number of mechanochromic systems, based on organic molecules [3] and metal complexes, [4] have been developed. In early stages of research, high-pressure effects on the electrostatic structure of organic crystals such as anthracene, chrysene, and pyrene were reported. [5] Based on the recent advance in understanding the mechanochromic systems, Zou, Tian and co-workers have reported anthracenederivatives, which exhibit mechanochromism after mechanical grinding and high pressure. [3a] In 2013, Saito, Yamaguchi and co-workers reported a propeller-shaped tetrathiazoylthiophene whose luminescence displayed distinct emission color changes in response to mechanical grinding and high pressure. [3c] Intramolecular charge-transfer (CT) fluorophores with an electron acceptor (A) and an electron donor (D) were used to demonstrate photoluminescence color changes in response to mechanical grinding and high pressure. In the molecular designs, intramolecular rotation of phenyl rings and packing modes, such as p-p stacked aggregates or amorphous states, are essential to tune the emission properties. However, the organic molecules that have been reported so far possess a major drawback. Most of the organic molecules that exhibit mechanochromism show the change of molecular packing modes and molecular torsion angles based on monomer emission, excimer emission, and intramolecular CT emission. Therefore, when grinding or smashing to make the crystal smaller, the crystal structure unexpectedly changes or collapses to form an amorphous powder. It is necessary to use pristine crystals when evaluating the piezochromic properties against high pressure. To the best of our knowledge, organic molecules that show a weak fluorescence response to mechanical grinding/smashing (anisotropic pressure) but significant response to high pressure (quasi-isotropic pressure) are rare.A...

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Section: Figurementioning

confidence: 99%

Piezofluorochromism in Charge‐Transfer Inclusion Crystals: The Influence of High Pressure versus Mechanical Grinding

et al. 2018

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“…High pressure infrared reflectivity spectra were acquired at the infrared beamline of the Swiss Light Source [26] using a diamond anvil cell-based customized setup [27] fitting a Hyperion microscope. Freshly cut ∼ 0.03 × 0.04 × 0.01 mm samples with the surface oriented parallel to the c and b axes were loaded in the sample chamber consisting of CuBe gaskets with ruby chips.…”

Section: Resultsmentioning

confidence: 99%

Pressure-induced structural transitions triggering dimensional crossover in the lithium purple bronze Li0.9Mo6O17

et al. 2021

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At ambient pressure, lithium molybdenum purple bronze (Li 0.9 Mo 6 O 17 ) is a quasi-one-dimensional solid in which the anisotropic crystal structure and the linear dispersion of the underlying bands produced by electronic correlations possibly bring about a rare experimental realization of Tomomaga-Luttinger liquid physics. It is also the sole member of the broader purple molybdenum bronzes family where a Peierls instability has not been identified at low temperatures. The present paper reports a pressure-induced series of phase transitions between 0 and 12 GPa. These transitions are strongly reflected in infrared spectroscopy, Raman spectroscopy, and x-ray diffraction. The most dramatic effect seen in optical conductivity is the metalization of the c axis, concomitant to the decrease in conductivity along the b axis. This indicates that high pressure drives the material away from its quasi-one-dimensional behavior at ambient pressure. Although the first pressure-induced structure of the series is resolved, the identification of the underlying mechanisms driving the dimensional change in the physics remains a challenge.

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“…Accordingly, HP-IR instrumentation developed by different groups has been reported. [118][119][120][121][122][123][124][125][126] A diamond anvil cell (DAC) 127,128 is most commonly used as the central part. Ruby particles are used for the precise measurement of the pressure inside a DAC.…”

Section: Mechanicsmentioning

confidence: 99%

“…123 However, designs that allow reflection exclusively, are also available. 118,121,122 Generally, the application of force along particular crystal axes causes structural changes, leading to denser crystal packing of the molecules. At high pressures (in the GPa order of magnitude) chemical bonding, molecular configuration and crystal structures are significantly affected.…”

Section: Mechanicsmentioning

confidence: 99%

Infrared spectroscopic monitoring of solid-state processes

Biliškov

2022

Phys. Chem. Chem. Phys.

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Versatile setup for optical spectroscopy under high pressure and low temperature

Cited by 9 publications

References 24 publications

Piezofluorochromism in Charge‐Transfer Inclusion Crystals: The Influence of High Pressure versus Mechanical Grinding

Piezofluorochromism in Charge‐Transfer Inclusion Crystals: The Influence of High Pressure versus Mechanical Grinding

Pressure-induced structural transitions triggering dimensional crossover in the lithium purple bronze Li0.9Mo6O17

Infrared spectroscopic monitoring of solid-state processes

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