“…[21] In Table 3, a number of the copper(II) compounds is The magnetic susceptibility is then defined by Equation listed with decreasing CuϪCu distances, studied both mag- (1): netically and by use of X-ray crystallography. A number of relevant crystallographic and magnetic parameters are also (1) cluded that the metal-metal distance is one of the important factors, except when the bridging unit is azido, [5d] oxam-(N, g, µ B , k, and T have their usual meanings, the exchange parameter is denoted as J.…”