Abstract
Crystals structures of two modifications of the copper(II) compound with racemic threonine Cu(D-Tre)(L-Tre) are determined by the electron diffraction technique. The unit cell parameters, space group, and number of formula units per unit cell for the crystals of two modifications are as follows: a = 11.10(3) A b = 9.56(2) A, c = 5.11(2) A, γ = 92.6(2)°, space group P21/b, and Z = 2 (I); and a = 22.20(3) A, b = 9.56(2) A, c = 5.11(2) A, γ = 92.6(2)°, space group C21/b, and Z = 4 (II). The structures are polytypic modifications of the same compound.
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