Structure and dynamics of terephthalic acid from 2 to 300 K. II. The temperature dependence of the disorder: a solid-state NMR study

Journal Article · Wed Jan 01 04:00:00 EST 1986 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(86)90013-7· OSTI ID:6012900

Meier, B H; Ernst, R R

The structure of terephthalic acid C/sub 6/D/sub 4/(COOD)/sub 2/ has been found to be ordered to a high extent at 2 K, whereas an almost complete disorder of the hydrogen-bond protons was observed at 300 K. In this part, the temperature dependence of the dipolar lineshape of the two hydrogen-bonded protons in ring-deuterated terephthalic acid (C/sub 6/D/sub 4/(COOH)/sub 2/ is studied. The results are consistent with dynamic disorder in an asymmetric double-minimum potential with a free enthalpy difference of the two tautomeric species of 2 kJ/mole. 5 references, 3 figures.

• Research Organization: ETH-Zentrum, Zurich, Switzerland
• OSTI ID: 6012900
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 61:1; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
CARBOXYLIC ACIDS
CRYSTAL STRUCTURE
DATA
DEUTERIUM COMPOUNDS
DICARBOXYLIC ACIDS
ENERGY
EXPERIMENTAL DATA
FORMATION FREE ENTHALPY
FREE ENTHALPY
HYDROGEN COMPOUNDS
INFORMATION
MAGNETIC RESONANCE
MEDIUM TEMPERATURE
NUCLEAR MAGNETIC RESONANCE
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
POWDERS
RELAXATION
RESONANCE
SPIN-LATTICE RELAXATION
TEMPERATURE DEPENDENCE
TEREPHTHALIC ACID
THERMODYNAMIC PROPERTIES
VERY LOW TEMPERATURE