Copper complexes pseudo-octahedral

The observation of the pseudo octahedral and pseudo compressed octahedral stereochemistries for the copper(II) ion then arise as an artifact of fluxional behaviour, Fig. 2 (A) for CuL6 chromophores and Fig. 3 (B) for the latter in CuL4X2 complexes. In... 

Copper(II) bis[(0-alkyl)-4-ethoxyphenyldithiophosphonato] and chromium(III) tris[(0-alkyl)-4-ethoxyphenyldithiophosphonato] complexes (alkyl = Me, Et, Pr1) were prepared and studied by magnetic measurements, and electronic, IR, and EPR spectroscopy. The valence vibrations of the PS2 group show that this group coordinates as isobidentate. The powder EPR spectra are typical for square-planar monomeric species and present hyperfine and superhyperfine structure. The EPR bands of the chromium(III) complexes may be attributed to metal ions in a pseudo-octahedral environment, coupled by dipole-dipole interaction.123... 

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