Hydrogen bonding in the crystal structure of bis{3-[(thiomethyl)methyl]pyrazole}copper(II) perchlorate

The ability of a metal-coordinated pyrazole to engage in hydrogen bonding h as been explored by synthesis of the title complex, bis{3-[(thiomethyl)meth yl]pyrazole}copper(II) perchlorate (3). The coordination in 3 can be descri bed as pseudo-octahedral, with two relatively tightly-bound 3-[(thiomethyl) methyl]pyrazole ligands occupying the equatorial plane, forming a [CuN2S2]( 2+) unit with the S donors mutually trans to each other. The axial position s are each filled by a weakly bound perchlorate counterion, one oxygen of w hich forms a hydrogen bond with the pyrazole N-H moiety on an adjacent [CuN 2S2](2+) unit. (C) 2001 Elsevier Science B.V. All rights reserved.