AbstractThe composition of the coordination compound formed by the anti‐isomers of 2‐hy‐droxy‐4(5)‐substituted benzophenone oximes with copper was deduced to contain a ligand‐metal ratio of 2:1, based on the data of Job's and slope method as well as by the method of saturated extraction and elemental analysis.By the method of UV and IR spectroscopies and molecular weight determination the structures of the complexes were elucidated. As central ion, copper was linked with phenolic oxygen and oximidonitrogen by covalent and coordinated bonds respectively. Meanwhile, the oximido hydroxy group formed stronger intermolecular hydroxy bond with phenolic oxygen of another ligand molecule. The resulting molecule seemed to be in planar square co