The crystal structure of [Ca(C4HsN30)C12] .H20 was determined by X-ray diffraction. The complex crystallizes in the monoclinic space group P2~/c with a = 7.410(1), b = 16.152(2), c = 8.351 (1) A, fl = 107.60 (2) ° and Z = 4. The final R value is 0.070. The Ca 2+ cation is in a pentagonal-bipyramidal environment and is coordinated in the basal plane by two CI atoms, the N(3) and 0(2) atoms of a cytosine base, and 0567-7408/80/081793-05501.00 the 0(2) atom of an adjacent cytosine base. The axial sites are occupied by a C1 atom and an H20 molecule.
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