Structure and thermal properties associated with some hydrogen bonds in crystals. IV. Isotope effects in some acid phosphates

Autor:	Alfred Rene Jean Paul Ubbelohde, Ida Woodward
Rok vydání:	1942
Předmět:	Crystallography General Energy Hydrogen chemistry Deuterium Hydrogen bond Lattice (order) Thermal Kinetic isotope effect chemistry.chemical_element Crystal structure Monoclinic crystal system
Zdroj:	Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences. 179:399-407
ISSN:	2053-9169 0080-4630
DOI:	10.1098/rspa.1942.0014
Popis:	The isotope effect has been measured for (NH 4 )H 2 PO 4 . Expansion of the crystal lattice takes place on substituting deuterium for hydrogen. The expansion is in the direction of the hydrogen bonds, and is of the same magnitude as in the isomorphous KH 2 PO 4 . A contraction of the lattice at right angles to the plane containing the hydrogen bonds is considerably larger for (NH 4 )H 2 PO 4 than for KH 2 PO 4 . From an application of the calculus of errors, the accuracy of the results is estimated to be α 11 = + 0.00269 ± 0.00006, α 33 = - 0.00123 ± 0.00009. Further investigations on the monoclinic form of KD 2 PO 4 has shown the presence of curious diffuse reflexions in moving-film photographs. Attempts to obtain (NH 4 )D 2 PO 4 or KH 2 PO 4 in the monoclinic structure were unsuccessful.
Databáze:	OpenAIRE
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