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0~CH2V207, orthorhombic, Fdd2, a=20.645 (20), b=8.383 (7), c=6.442 (12) A, Z=8, Dexp=3-969, Dx=3.94 g cm -a. Crystals were grown from a melt under 02 atmosphere. The anion, V207, contains a crystallographic twofold axis through the bridging oxygen atom with V-O bond lengths ranging from 1.648 (5) to 1.743 (2) A and a V-O-V angle of 147.8 (5) °. Cu 2+ is bonded strongly to four oxygen atoms with Cu-O bond lengths ranging from 1.880 (5) to 1.972 (5)/~ and weakly to a fifth at 2.542 (4) A.