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Abstract. [CuC12(CaH20N20) imposed symmetry but has an approximate molecular C(7N2) mirror plane passing through Cl(1), C1(2), Cu and 0(4).] Experimental. Compound prepared by reaction ofCuC12.2H20 with bis(2-dimethylaminoethyl) ether in boiling ethanol, crystals obtained by cooling of reaction mixture. Blue-green columnar crystal, 1.08 x 0.35 × 0.35 mm, AED2 four-circle diffractometer, graphite-monochromated Cu Ka radiation, cell parameters from 0 values of 128 reflections measured at +o9 (15 < 0 < 17.5°). For data collection, 09--28 scans with o) scan width (0.70+0.347tan0) °, 20max= 120 °, h 0-, 13, k 0--,13, l 0--,20, no significant crystal movement or decay, initial absorption correction using ~, scans, 1872 unique reflections, giving 1668 with F > 6a(F) for structure solution [from a Patterson synthesis (Cu) followed by iterative cycles of leastsquares refinement and difference Fourier synthesis] and refinement [using full-matrix least squares on F

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