EPR‐Spectroscopic Characterization of Assoziating Cu(II)‐complexes of Vinylogic Amides
The e.s.r. spectra of glassy solutions of the Cu(II)‐complexes with different enaminone‐ligands were measured in dependence on substituents and solvent polarity.
CuCu distance and spatial angle α are calculated using the model of SMITH and PILBROW. In methylcylohexane only dimers could be detected. Two types of dimeric compounds were observed for which an interplane distance of r = 0.4 nm was calculated.
In dimeric Cu‐complexes of 4‐anilinomethylen‐δ2‐pyrazolin‐5‐ones the CuCu axis is perpendicular (α = 0°), in dimeric Cu‐complexes of anilinomethylenpentan‐2,4‐diones the CuCu‐axis is inclined (α = 35°).