CRYSTAL AND MOLECULAR-STRUCTURE OF ANHYDROUS COPPER(II) PERCHLORATE

The structure of the pale blue-green Cu(ClO4)2 obtained by sublimation has been determined from single-crystal X-ray diffraction data. The s tructure was refined in the monoclinic space group P2(1)/c, Z = 2, a = 4.584(1), b = 8.326(2), c = 8.015(1) angstrom and beta = 114.21(1)-de gree, R = 0.044 for 894 observed reflections. The copper has a distort ed-octahedral environment with four equatorial oxygen atoms at short d istances [1.96(1) angstrom] and two long Cu-O axial interactions [2.46 (1) angstrom]. Perchlorate groups are bridging bidentate, and can be r egarded as pseudo-tridentate, leading to a three-dimensional polymeric network of infinite cross-linked chains interacting through long Cu-O contacts.