Copper(II) complexes with Girard-T and -D reagents
The cupric complexes of Girard-T and -D reagents have been investigated. Potentiometric and spectrophotometric experiments showed that Girard-T formed 1 : 1 and 2 : 1 ligand–cupric ion complexes, whereas Girard-D formed only a 1 : 1 complex. Acid dissociations from the cupric complexes of both reagents were recognized. The complexes, Cu(Gir-T)2 and Cu(Gir-D), were isolated in the crystalline state. The scheme for the proton dissociation of Girard reagents and hydrazones has been revised.