The thermochemistry of 2,4-pentanedione revisited: Observance of a nonzero enthalpy of mixing between tautomers and its effects on enthalpies of formation

Article Abstract:

The enthalpies of formation of pure liquid and gas-phase (Z)-4-hydroxy-3-penten-2-one and 2,4-pentanedione are examined in the light of some more recent NMR studies on enthalpy differences between gas-phase enthalpies of the two tautomers. Results in enthalpy differences between the two tautomers both in the liquid and gas phases that are identical within the experimental error, and in excellent agreement with recent gas-phase NMR studies are illustrated.

Industrial Organic Chemicals, Cyclic Crude and Intermediate Manufacturing, C5 Hydrocarbons, Thermal properties, Chemical properties, Thermochemistry

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Biomimetic assembly of polypeptide-stabilized CaCO3 nanoparticles

Article Abstract:

A simple polypeptide-directed strategy for fabricating large spherical assembly of CaCO3 nanoparticles is reported. Stepwise growth and assembly of a large number of nanoparticles are observed, from the formation of an amorphous liquidlike CaCO3-polypeptide precursor, to the crystallization and stabilization of polypeptide-capped nanoparticles, and, eventually the spherical assembly of nanoparticles.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Calcium Carbonate, Polypeptides, Atomic properties, Nanoparticles

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Phase diagram and sublimation enthalpies of model C60 revisited

Article Abstract:

The objective of the article was to reassess the previous results and conclusions on the simulation of model C60 and other fullerness. New sublimation enthalpies were reported in good agreement with the available experimental data and theoretical results.

Chemistry, Physical and theoretical, Physical chemistry, Gibbs' free energy, Phase diagrams, Sublimation (Physics)

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