Magnetostructural characterization of a monohydroxo-bridged, 1,1,2,2-tetrakis(2-pyridyl)ethylene-bridged copper(II) dimer

Abstract

The molecular structure of [Cu₂(dpm)₂L(OH)][CIO₄]₃·2H₂O [dpm = di(2-pyridyl)methane; L = 1,1,2,2-tetrakis(2-pyridyl)ethylene] has been determined by single-crystal X-ray diffraction: triclinic, space group P, a= 11.685(3), b= 14.569(2), c= 15.509(4)Å, α= 87.97(2), β= 73.34(2), γ= 74.15(1)° and Z= 2. The copper co-ordination geometry can be described as a square-based pyramid with the two copper(II) centres bridged by two groups, N–C–CC–C–N from L and the hydroxide ion. The bridging angle Cu–O–Cu is 137.9(4)° and the copper centres are separated by 3.663(3)Å. Magnetic susceptibility data collected as a function of temperature (5–400 K) are indicative of a relatively strong antiferromagnetic interaction (2J≈–360 cm^–1).