EPR and Spectral Studies of a Molecular and Crystal Structure of Cu (3,5-dimethylpyridine)₃(NO₃)₂

Cu - O - Cu superexchange of some polyolate-bridged copper(II) clusters

“…Via a comparison of the experimental results (black dots in figure 7) with the angular variation of ḡ, the g-factors g ⊥ = 2.029±0.002 and g = 2.280±0.002 for the Cu 2+ ion are obtained. These values are in good agreement with the known g-factor of Cu 2+ ions, whose ground states are orbital singlets of d x 2 −y 2 symmetry [13,14].…”

“…Due to the fourfold symmetry of the nearest neighbourhood of the Cu 2+ ions (see figure 1(a)) an axial spin-Hamiltonian is assumed in order to calculate the properties of the cluster [13,14]. The ESR spectrum of a frozen solution of the related complex [Cu(AnErytH −2 ) 2 ] 2− [5] confirms the validity of this assumption.…”

Vibrational Properties of the One-Dimensional, S = 1/2, Heisenberg Antiferromagnet Copper Pyrazine Dinitrate

“…The path of the superexchange has been determined by neutron diffraction experiments to be through the pyrazine molecules . The molecular structure of CuPzN provides many opportunities for the engineering of its lattice and subsequent magnetic interactions, which account for the popularity of this system. − These modifications include the possibility of substituting methyl groups on one or more carbon atoms of the pyrazine ring, replacing the S = 1 / 2 Cu spin sites with diamagnetic Zn atoms or isotopic substitution. In most cases the resulting magnetic properties are different from the pure compound.…”