Structural phase transition in 1-chloroadamantane (C<sub>10</sub>H<sub>15</sub>Cl)

Foulon, M.; Belgrand, Thierry; Gors, C.; More, M.

doi:10.1107/s0108768189002739

Cited by 37 publications

(43 citation statements)

References 6 publications

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“…27 These adamantane derivatives show a rich polymorphic behavior that has largely been studied. [28][29][30][31][32][33][34][35][36] The physical and chemical properties, even for the simple adamantane derivatives have not been studied for some of them in which the substitution concerns more than a halogen atom.…”

Section: -mentioning

confidence: 99%

Phase Transition in Hydrogen-Bonded 1-Adamantane-methanol

Hassine

Négrier

Barrio

et al. 2015

Crystal Growth & Design

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The polymorphism of 1-adamantane-methanol C 11 H 18 O has been investigated by differential thermal analysis and single-crystal and powder X-ray diffraction. Below the melting temperature (389.5 ± 0.4 K), this compound exhibits an orthorhombic phase (Phase I, Pnnm, Z=12, Z'=1.5). The melting enthalpy was determined to be 20.5 ± 0.4 kJ mol −1 , i.e.,with an entropy change of (6.34 ± 0.13)R, which is much higher than the quoted value fromTimmermans for the melting orientationally disordered phases (2.5R), thus supporting the orientationelly ordered character of phase I. This orthorhombic phase I exhibits a statistical disorder of the hydrogen atom related to the oxygen atom, due to the position of one independent molecule on the mirror. At ca. 272 K, phase I transforms continuously through an order-disorder transition to a low-temperature monoclinic phase II (P2 1 /n, Z=12, Z'=3). The monoclinic and orthorhombic phases are related by a group-subgroup relationship, which perfectly agrees with the continuous character of the II to I transition. Moreover, by a convenient choice of an order parameter related to the continuous tilt of the c-axis, the critical exponent for this transition is found to be close to the theoretical prediction of 3D-Ising model (with a critical exponent is of ca. 0.27).

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Section: -mentioning

confidence: 99%

Phase Transition in Hydrogen-Bonded 1-Adamantane-methanol

Hassine

Négrier

Barrio

et al. 2015

Crystal Growth & Design

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“…It reveals the existence of a monoclinic low-temperature phase, with a space group P2 1 /c, so isostructural to the lowtemperature monoclinic phase of 1-BrA as revealed by Foulon et al [25]. The authors also concluded that the size of the molecule, i.e., of the halogen substituent, controls the lattice dimension and, as a consequence, the lattice parameters.…”

Section: -Cl-adamantane (C 10 H 15 Cl)mentioning

confidence: 79%

Relationship between the two-component system 1-Br-adamantane + 1-Cl-adamantane and the high-pressure properties of the pure components

Levit

Lloveras

Aznar

et al. 2018

Fluid Phase Equilibria

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The temperature-composition phase diagram of the two-component system 1-Bradamantane and 1-Cl-adamantane has been determined by means of thermal analysis techniques and X-ray powder diffraction from the low-temperature phase to the liquid state. The crossed isopolymorphism formalism has been applied to the two-component system to infer the normal pressure properties of the orthorhombic metastable phase of 1-Cladamantane at normal pressure. The experimental pressure-temperature phase diagrams for the involved compounds are related to the two-phase equilibria determined at normal pressure and inferences about the monotropic behavior of the aforementioned orthorhombic phase are discussed.2

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“…To fully characterize the low-temperature phase II of 2A=O a rigid body molecule was built up based on similar adamantane derivatives. 38 Within the rigid body constraint, the structure of phase II of 2A=O was submitted to a Rietveld refinement. As an example, the experimental collected and final calculated x-ray profiles at 190 K are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Emergence of glassy-like dynamics in an orientationally ordered phase

et al. 2012

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The dynamics of a simple rigid pseudoglobular molecule (2-adamantanone) has been studied by means of dielectric spectroscopy and examined under the constraints imposed by the space group of the crystal structure determined by x-ray powder diffraction. The low-temperature monoclinic structure of 2-adamantanone, with one molecule per asymmetric unit (Z = 1), displays a statistical intrinsic disorder, concerning the site occupancy of the oxygen atom along three different sites. Such a physically identifiable disorder gives rise to large-angle molecular rotations which inherently lead to time-average fluctuations of the molecular dipole, thus contributing to the dielectric susceptibility. The dielectric spectra for the low-temperature "ordered" phase displays a universal feature of glassy-like materials, i.e., coexistence of α-and β-relaxation processes. The former is clearly identified with the strongly restricted reorientational motions within the long-range "ordered" crystalline lattice. The latter, never observed before in fully translationally and highly orientationally ordered phases, displays all the properties of an original Johari-Goldstein β-relaxation, in spite of the strong character of this glass-like phase. These findings can be explained according to the coupling model, applied to such "ordered" phases.

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Structural phase transition in 1-chloroadamantane (C₁₀H₁₅Cl)

Cited by 37 publications

References 6 publications

Phase Transition in Hydrogen-Bonded 1-Adamantane-methanol

Phase Transition in Hydrogen-Bonded 1-Adamantane-methanol

Relationship between the two-component system 1-Br-adamantane + 1-Cl-adamantane and the high-pressure properties of the pure components

Emergence of glassy-like dynamics in an orientationally ordered phase

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Structural phase transition in 1-chloroadamantane (C10H15Cl)

Cited by 37 publications

References 6 publications

Phase Transition in Hydrogen-Bonded 1-Adamantane-methanol

Phase Transition in Hydrogen-Bonded 1-Adamantane-methanol

Relationship between the two-component system 1-Br-adamantane + 1-Cl-adamantane and the high-pressure properties of the pure components

Emergence of glassy-like dynamics in an orientationally ordered phase

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Structural phase transition in 1-chloroadamantane (C₁₀H₁₅Cl)