The structure and magnetism of the (4,4'-bipy h2)cu2cl6 complex with infinite linear chains of dimeric units

The magnetic susceptibility of (4,4'-bipy H₂ )cu₂cl₆ has been measured over the temperature range 4.2 to 292 K. The principal structural units of the compound appear to be Cu₂Cl^2?₆ dimers arranged in linear chains throughout the crystal. Spin interaction is active between the copper atoms belonging to different Cu₂ Cl^2?₆ dimer ions as well as between the copper atoms within a dimer ion. The experimental results are compared with the Ising model for linear chains and the dimer model.