title: Two complexes of CuBr(2) with 5-tert-butylpyrazole.
abstract: trans-Dibromobis(5-tert-butylpyrazole-N(2))copper(II), trans-[CuBr(2)(Hpz(tBu))(2)] (Hpz(tBu) is 5-tert-butylpyrazole, C(7)H(12)N(2)), exhibits a distorted square-planar geometry with a significant tetrahedral twist, while trans-dibromotetrakis(5-tert-butylpyrazole-N(2))copper(II), trans-[CuBr(2)(Hpz(tBu))(4)], adopts a distorted octahedral geometry across a crystallographic inversion centre. Both compounds exhibit intramolecular N--H...Br hydrogen-bonding interactions.
authors.affiliation: School of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, England.
authors.forename: X
authors.initials: X
authors.lastname: Liu
authors.forename: C A
authors.initials: CA
authors.lastname: Kilner
authors.forename: M
authors.initials: M
authors.lastname: Thornton-Pett
authors.forename: M A
authors.initials: MA
authors.lastname: Halcrow