منابع مشابه
Hydrogen bond strength and bond geometry in cyclic dimers of crystalline carboxylic acids.
In a study of 101 crystal structures of carboxylic acids we have observed a clear trend in the difference between the formally single and formally double C-O bond distances, as observed by X-ray diffraction, with a clear-cut distinction between aromatic acids, where the two distances are similar, and non-aromatic acids, where the two distances distinctly differ by 0.06-0.12 A. A tentative energ...
متن کاملTriphenylphosphine-catalysed amide bond formation between carboxylic acids and amines.
Unactivated carboxylic acids and amines undergo organocatalytic Ph3P/CCl4-mediated amide bond formation by employing in situ reduction of triphenylphosphine oxide to triphenylphosphine in the presence of diethoxymethylsilane and bis(4-nitrophenyl)phosphate.
متن کاملHydrogen-bond motifs in the crystals of hydrophobic amino acids.
A computer program has been developed to survey a set of crystal structures for hydrogen-bond motifs. Possible ring and chain motifs are generated automatically from a user-defined list of interacting molecular fragments and intermolecular interactions. The new program was used to analyse the hydrogen-bond networks in the crystals of 52 zwitterionic alpha-amino acids. All the possible chain mot...
متن کاملDetermination of Carboxylic Acids in Apple Juice by RP HPLC
Low molecular weight organic acids are most predominant in apple juice among these components fumaric acid was not exceed more than 5 ppm. It was thought that the HPLC is the best method of the determination of organic acids in the apple juice. In this study, chromatographic separation of organic acids of apple juice was obtained by preparing a sample and by applying them to acid phase for ...
متن کاملBond dissociation energies
The bond dissociation energy (enthalpy) is also referred to as bond disruption energy, bond energy, bond strength, or binding energy (abbreviation: BDE, BE, or D) . It is defined as the standard enthalpy change of the following fission: R−X → R + X . The BDE, denoted by Do(R−X), is usually derived by the thermochemical equation, Do(R−X) = ∆fH o(R) + ∆fH o(X) – ∆fH o(RX) . The enthalpy of format...
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ژورنال
عنوان ژورنال: The Journal of Chemical Physics
سال: 1952
ISSN: 0021-9606,1089-7690
DOI: 10.1063/1.1700640