Differential Thermal Analysis and Dielectric Studies on 2-Methyl-2-Nitro-Propane under High Pressure

Büsing, D.; Jenau, M.; Reuter, J.; Würflinger, A.; Tamarit, J. Ll.

doi:10.1515/zna-1995-4-524

Cited by 5 publications

(1 citation statement)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2-Chloro-2-methyl-propane, (CH 3 ) 3 CCl or tert -butyl-chloride (TBCl), belongs to a group of molecular compounds of common chemical structure, (CH 3 ) 3 CX. For a large number of substituents X, the existence of an orientationally disordered phase has been found (X = Br, I, CN, SH, NO 2 , CH 3 , NH 2 , COOH, CH 2 OH, and so on). − Many detailed studies of the molecular motions in the solid phases of tert -butyl compounds have been performed using neutron scattering, − dielectric, − NMR, − and, to a lesser extend, X-ray diffraction − techniques. The results of these measurements have enabled researchers to better characterize the dynamics and the thermodynamics of the ordered and disordered phases.…”

Section: Introductionmentioning

confidence: 99%

Thermal and Structural Characterization of (CH₃)₃CCl

et al. 2000

View full text Add to dashboard Cite

The polymorphism of (CH 3 ) 3 CCl has been further investigated by both thermal and X-ray powder diffraction experiments. From the former, the phase transitions between the different phases (IV, III, II, I, and L) have been thermally characterized, and in particular, the temperature domain of phase II has been settled to be from 217.9 to 219.8 K by means of C p measurements. The structure of the lowest-temperature phase IV of (CH 3 ) 3 CCl has been determined by X-ray powder diffraction and Rietveld profile refinement. The structure, P2 1 /m with two molecules per unit cell, has been found to be isostructural with that of phase II of (CH 3 ) 3 CCN. The intermolecular interactions in the solid-state phases for (CH 3 ) 3 CCl as well as for (CH 3 ) 3 CCN have been analyzed by the study of the isobaric thermal-expansion tensor. The anisotropy of such interactions are discussed in the light of the previously studied dynamics disorder.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermal and Structural Characterization of (CH₃)₃CCl

et al. 2000

View full text Add to dashboard Cite

show abstract

Differential Thermal Analysis of Long‐Chainn‐Alcohols under High Pressure

Reuter

Würflinger

1995

Ber Bunsenges Phys Chem

View full text Add to dashboard Cite

Differential thermal analysis (DTA) measurements under pressures up to 250 MPa and temperatures of about 300 to 370 K have been performed on long chain n-alcohols C nH2 n + ,OH, including I-tetradecanol, I-pentadecanol, I-hexadecanol, I-heptadecanol and I-octadecanol. On heating, these alcohols change from a crystalline to a rotator phase a few degrees below their melting points. The rotational state of I-tetradecanol can only be reached by cooling from the melt. The p-Tphase diagrams of these alcohols have been established. They demonstrate, that the coexistence region of the rotator phase is increased under pressure. In contrast to the high-pressure phase behaviour of long chain n-paraffins the phase transition lines of n-alcohols diverge upon increasing pressure and no triple point is observed. This different behaviour is connected with the enlarged enthalpy change at the transitions to the rotator phase that reduces the slope dT/dp of this phase transition line. Dielectric measurements were performed on I-pentadecanol which support the orientationally disordered state of the rotator phase.

show abstract