Structure of metal bischelates with enaminoketone derivatives of sterically hindered 2-imidazoline

Crystal structures of the first Cu(II), Ni(II), and Pd(II) bischelates with enaminoketone derivatives based on the 2-imidazoline heterocycle have been determined. In all the compounds, the coordinated heterocycles have art envelope conformation leading to a puckered structure of the complex molecules.