A neutron diffraction study of hydrogen bonding in the deuterium (hydrogen) L-arginine phosphate monohydrate
Abstract
The crystal structure of the title compound D(H)LAP with chemical formula (D2N)2CND · (CH2)3CH(ND3)CO2 · D2PO4 · D2O has been determined by single crystal neutron diffraction. Positional and thermal parameters of atoms were refined by block diagonal matrix least-squares technique. A final Rf value of 0.048 was obtained for 1040 observed independent reflections. The crystal structure consists of alternate layers of phosphate groups and ariginine molecules stacked along the a-axis and held together by hydrogen bonds. By deuteration of HLAP, the deuteriums occupy hydrogen positions except those hydrogen atoms bonded to carbon atoms. All the D(H) bond lengths in D(H)LAP are about 10% to 30% longer than those in HLAP And bond angles are obviously different from references [1] and [2].
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