Thermal expansion of coronene C24H12 at 185–416 K

Litasov, Konstantin D.; Gavryushkin, Pavel N.; Yunoshev, A. S.; Rashchenko, Sergey V.; Inerbaev, Talgat M.; Аkilbekov, A.

doi:10.1007/s10973-014-4253-x

Cited by 5 publications

(4 citation statements)

References 36 publications

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“…Coronene films were evaporated from a homemade Knudsen cell at ∼420 K with a corresponding evaporation rate of 0.5 ML/min, while the substrate was kept around 90 K to suppress thermal desorption of coronene molecules. The constant substrate temperature in our experiment was also necessary in the comparative study of growth behaviors of coronene on different substrates with varied coupling strength since the substrate temperature played an important role in the formation of monolayer structures as well as bulk structure . Potassium atoms were evaporated from a commercial dispenser (SAES).…”

Section: Experimental Methodsmentioning

confidence: 99%

Growth Behavior of Pristine and Potassium Doped Coronene Thin Films on Substrates with Tuned Coupling Strength

Que

Zhuang

et al. 2017

J. Phys. Chem. B

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The growth of polycyclic aromatic hydrocarbon (PAH) molecular coronene film on various substrates and the subsequent doping of potassium under ultrahigh vacuum (UHV) conditions have been systematically investigated by low-temperature scanning tunneling microscopy and spectroscopy (STM/STS). The crystalline structures and molecular orientations of coronene thin films are both thickness-dependent and substrate-sensitive due to the competition between molecule-substrate interaction and intermolecular interaction. In mono- or bilayer films, coronene molecules are flat-lying on the surface with hexagonal lattice, whereas in multilayer films, the topmost molecules are in a standing-up but tilted configuration with rectangular lattice. In particular, a 2 × 1 superstructure with respect to that of bulk coronene is formed on thick KCl film. Furthermore, we have studied the potassium doped coronene monolayer and multilayer on Ag(100) and KCl/Ag(100) surface. For K-doped coronene monolayer, at certain doping ratio x = 3, the lowest unoccupied molecular orbital (LUMO) of coronene film moves to the Fermi level, and a splitting of the LUMO state is observed. Increased potassium doping would result in a filled LUMO state below the Fermi level. By contrast, no well-ordered structures are obtained in the K-doped coronene multilayers which are vulnerable to rather moderate annealing processes owing to their relatively weak bonding with the supporting substrates, implying a big challenge of growth of PAH thick films in vacuum. The differences in the crystal structures of coronene thin films compared with that in bulk crystals might shed insight on the controversies in the experimental results on the electronic properties of alkali-metal-doped PAHs.

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Section: Experimental Methodsmentioning

confidence: 99%

Growth Behavior of Pristine and Potassium Doped Coronene Thin Films on Substrates with Tuned Coupling Strength

Que

Zhuang

et al. 2017

J. Phys. Chem. B

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“…XRD is widely used in studies. Nowadays, many researches about thermal expansion are concentrated on the inorganic materials [17][18][19] and metal-organic frameworks (MOFs) [20][21][22], while the studies about energetic materials are less. Our group has obtained exact and reliable CTEs of RDX [23], HMX [24], HNS [25], and TATB [26,27] by using X-ray powder diffraction and Rietveld refinement.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the thermal expansion of α-CL-20 with different water contents

Liu

Song

et al. 2015

J Therm Anal Calorim

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The thermal expansions of three kinds of a-CL-20 crystals have been investigated in the temperature range from 30 to 130°C by means of various-temperature X-ray powder diffraction (XRD) together with Rietveld refinement. The crystals were characterized by SEM, XRD, FTIR, and DSC/TG. The results show that the three samples contain 1/2, 1/4 mol, and none structural water, respectively. The a-CL-20 crystals all perform linear and anisotropic thermal expansion, while some differences exist. The unit-cell axes increase linearly with increasing temperature except for the a-axis. The expansion along the a-axis switches from positive to negative thermal expansion at 90°C for a-CL-20Á1/2H 2 O. The a-axis exhibits positive thermal expansion (PTE) with thermal irresilience for a-CL-20Á1/4H 2 O while PTE with thermal resilience for the anhydrous a-CL-20. The differences are caused by the structural water. The removal of structural water leads to the collapse of a-axis, further results in structural changes of the unit cell. Different water contents can cause different degree of structural changes, leading to the difference of thermal expansion behaviors.

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“…3,38,39 Its crystals are thermostable and could emit bright green fluorescence under ultraviolet rays (UV) irritation (Figure 2b,e and Figure S3 in the Supporting Information). 40,41 (2) TFBQ is a lightweight, small-sized molecule with strong electron-accepting ability, and its crystal form (Figure 2c,f) is volatile under thermal stimuli which qualified as jumping- mate. 42,43 (3) COR and TFBQ are an ideal donor−acceptor pair, and able to experimentally self-assemble into an unprecedented black cocrystal (COR-TFBQ, CCDC 1943140, Figure 2d,g) accompanied by the static chargetransfer quenching on the fluorescence of COR, 44−48 hence showing electronic properties only.…”

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confidence: 99%

“…For a proof-of-concept, a case study was performed in this work to highlight the advantage of this new design strategy. Coronene (COR) and tetrafluoro-1,4-benzoquinone (TFBQ) were chosen as the main component and the jumping-mate, respectively (Figure a), for the following reasons: (1) COR is a π-conjugated molecule with high symmetry ( D 6 h ). ,, Its crystals are thermostable and could emit bright green fluorescence under ultraviolet rays (UV) irritation (Figure b,e and Figure S3 in the Supporting Information). , (2) TFBQ is a lightweight, small-sized molecule with strong electron-accepting ability, and its crystal form (Figure c,f) is volatile under thermal stimuli which qualified as jumping-mate. , (3) COR and TFBQ are an ideal donor–acceptor pair, and able to experimentally self-assemble into an unprecedented black cocrystal (COR-TFBQ, CCDC 1943140, Figure d,g) accompanied by the static charge-transfer quenching on the fluorescence of COR, − hence showing electronic properties only. As a result, by thermally induced removal of TFBQ, besides the ability to jump, the cocrystals will also achieve switching between optical function and electronic function.…”

mentioning

confidence: 99%

Jumping Crystal Based on an Organic Charge Transfer Complex with Reversible ON/OFF Switching of Luminescence by External Thermal Stimuli

Chen

Gong

2021

ACS Materials Lett.

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Jumping crystals, as newly emerging crystal materials that can effectively convert non-kinetic energy into kinetic energy to jump, have attracted great research interest lately. Existing jumping crystals are discovered by accident or designed based on the principle that generates force through lattice deformation, whereas in this contribution, we propose a de novo concept to design versatile jumping crystals by simply introducing a “jumping-mate” (an easily escaping component under stimuli), which is more reliable and achievable. A charge transfer complex of coronene and tetrafluoro-1,4-benzoquinone was constructed as a proof-of-concept, which showed various jumping behaviors (including directional jumping) and reversible ON/OFF switching of luminescence under thermal stimuli. The rare dynamic internal conversion between electronic and optical functions was also realized in our system. Our findings may guide the creation of a new generation of advanced multi-functional jumping crystals.

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Thermal expansion of coronene C24H12 at 185–416 K

Cited by 5 publications

References 36 publications

Growth Behavior of Pristine and Potassium Doped Coronene Thin Films on Substrates with Tuned Coupling Strength

Growth Behavior of Pristine and Potassium Doped Coronene Thin Films on Substrates with Tuned Coupling Strength

Investigation on the thermal expansion of α-CL-20 with different water contents

Jumping Crystal Based on an Organic Charge Transfer Complex with Reversible ON/OFF Switching of Luminescence by External Thermal Stimuli

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