Crystals of chromous acetate are monoclinic with space group C2/c. The unit cell, of dimensions a = 13.15, b =-8.55, c = 13.94 A, fl ~--117 ° 0', contains four Cr2(CttaCOO)4.2H20 molecules. Projections of the structure on two crystallographic planes are given and from these it is inferred that chromous and cupric acetate are isostructural.The most striking feature of the structure is the close approach of 2.64 /~ between the two chromium atoms in a molecule, which, as in the case of the cupric acetate structure, suggests direct interaction between such atoms.
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