A novel three-dimensional copper(II) network via hydrogen bonds: diaqua-bis[bis(pyrazol-1-yl-kappa N-2)methane]copper(II) diperchlorate

The crystal structure of the title complex, [Cu(C7H8N4)(2)(H2O)(2)](ClO4)(2 ), consists of a discrete centrosymmetric [Cu(C7H8N4)(2)(H2O)(2)](2+) catio n and two perchlorate anions. The Cu-II centre is six-coordinated by four N donors from the two pyrazole rings [Cu-N 1.998 (2) and 2.032 (3) Angstrom] and two O atoms from the water molecules occupying the apical sites [Cu-O 2.459 (3) Angstrom]. The coordination geometry of the complex can be descri bed as octahedral. There is a unique three-dimensional network in which the perchlorate units are linked by a combination of strong O-H . . . O and we ak C-H . . . O hydrogen bonds.