Abstract
Four kinds of non-substituted imidazolate(im)-bridged copper(II) complexes using tris(1-pyrazolyl)methane (pz3CH) as a capping ligand, namely, [Cu(μ-im)(pz3CH)]nXn (X=BF4 (1), ClO4 (2), CF3SO3 (3), (SO4)0.5 (4)) were prepared. Their crystal structures have been determined, and despite the different space groups (orthorhombic Pna21 for 1–3 and monoclinic P21/n for 4) and the variety of counter anions, they consist of equally-spacing polymeric chains. The Cu ion in 1–3 has a quasi-six-coordination environment, while the Cu ion in 4 has a nearly five-coordination one. The Bonner-Fisher model gave the exchange coupling parameters 2J/kB=−98.2(16), −106.6(10), −102.0(6), and −104.2(8) K for 1–4, respectively. The strong exchange couplings originate in the equatorial coordination of the Nim atoms. We revealed that the magnitude of J values is influenced by the counter anion. The usability of the neutral pz3CH capping ligand as well as anionic pz3BH− has been shown.
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