Pure and doped (0" 1% Cr) crystals of K3Co(CN)6, grown from aqueous solution, were examined by single-crystal X-ray methods. Four structural types were observed: Two-layer orthorhombic, and one-, three-, and seven-layer monoclinic, the latter two being new. The cells are related by stacking of (100) one-layer monoclinic lamellae; the mechanism, indicated from space-group considerations, is one of rotation about c and stacking on (100). The geometrical relationships demonstrate polytypism in this complex cyanide.
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Kohn et al. (1961) studied this question.