Synthesis and magneto-optical properties of a series of bis(β-diketonato) Co(II) complexes with imino nitroxide radical chelate

A series of bis(4,4,4-trifluoro-1-R-1,3-butanedinato) Co(II) complexes with imino nitroxide radical(IM2py), [Co(Rtfc)2(IM2py)] (R = trifluoromethyl, phenyl, naphthyl, thienyl), was prepared and characterized by the X-ray analysis which demonstrated the stereospecific formation of the trans(CF3)-isomer with the trans disposition of the CF3 groups. The significant substituents effect on the UV–Vis spectra and magnetic properties were discussed in consideration of the inversion of the dπ(t2g) orbital levels leading to the orbital orthogonality or overlap with the SOMOπ∗ of IM2py in terms of the AOM parametrizations or spin-paring energy.

Graphical abstractFor a series of the stereospecifically formed bis(β-diketonato)(IM2py) Co(II) complexes, trans(CF3)-[Co(Rtfc)2(IM2py)] both the magnetic interaction and MLCT band is affected by the substituents of the β-diketonates, which is elucidated in consideration of the inversion of the dπ(t2g) orbital levels leading to the orbital orthogonality or overlap with the SOMO of IM2py in terms of AOM parametrization.Figure optionsDownload full-size imageDownload as PowerPoint slide