In this communication, the structure of P-3A Cu(II)-complex as determined by X-ray crystallographic analysis is presented. The crystals of P-3A Cu(ll)-complex as recrystallized from aqueous solutions were rhombohedral in shape and dark blue in color. As the crystals readily deteriorated in air by losing water of crystallization, they were sealed in glass capillaries prior to exposure to X-rays. A specimen of the approximate dimensions 0.2 x 0.2 x 0.25 mm was mounted on a Philips PW-1100 diffractometer and the unit cell dimensions and intensity data were measured with monochromatic (graphite plate) CuKa radiation. The cell dimensions ab17.075(9), c21.289 (I1) A, i-=120°, and the symmetry of the intensity distribution indicated that the LAUE group of the crystal must be 3 m. The space group was at first assumed to be P3,21* taking into account the LAUE group and the absent reflexions, 1=3 in 0 0 1. The density of the

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