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The use of perdeuteropolyethylpropylene (d-PEP) as a cryoprotectant for neutron studies of molecular organic solids is demonstrated by the solution of the structure of L-(-)-ephedrine hemihydrate from neutron powder diffraction data on a sample containing 20 wt% d-PEP. It is demonstrated that no contribution from d-PEP to the scattering is observed. Neutron diffraction studies of solvent-containing molecular crystals that require a perdeuterated cryoprotectant oil are thus possible.

Supporting information

cif

Crystallographic Information File (CIF) https://doi.org/10.1107/S0021889800018987/do0003sup1.cif
Contains datablocks Xray, neutron

pdf

Portable Document Format (PDF) file https://doi.org/10.1107/S0021889800018987/do0003sup2.pdf
Supplementary material

CCDC references: 151212; 151213

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