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metal-organic compounds
The structures of the commensurate 1/4 and 1/5 phases of the displacively modulated compound D-BCCD [deuterated betaine (trimethylammonioacetate) calcium chloride dihydrate, i.e. (CD3)3NCD2COOCaCl2(D2O)2 or CaCl2.C5D11NO2.2D2O] have
been determined by single-crystal neutron diffraction at 100 and 68 K,
respectively.
The structural model of the 1/4 phase is found to be quite different
from that
obtained previously from X-ray diffraction data of the hydrogenated
compound.