Synthesis, characterization and magnetic properties of .mu.-oxalato- and .mu.-oxamido-bridged copper(II) dimers. Crystal and molecular structures of [Cu2(mepirizole)2(C2O4)(H2O)2](PF6)2.cntdot.mepirizole.cntdot.3H2O and [Cu2(mepirizole)2(C2O4)(NO3)2(H2O)]2[Cu2(mepirizole)2(C2O4)(NO3)2] | doi.page