Summary
Trivalent chromium, manganese, iron and cobalt salts react withm-phenylenediamine and acetylacetone to give complexes of the type [M(C16H18N2O2)X]: X = Cl, Br, NO3 or NCS for M = chromium(III) and iron(III); X = Cl, Br, OAc or NCS for manganese(III); and X = OH for cobalt(III). Conductance measurements show the complexes to be nonelectrolytes. Molecular weights determined cryoscopically, show the iron complexes to be dinuclear. Magnetic measurements above 85 K reveal the presence of slight antiferromagnetic interactions. The complexes are dimeric five-coordinate square-pyramidal withm-phenylenediamine residues acting as bridges. The electronic spectra are interpreted in terms of the Normalised Spherical Harmonic Hamiltonian Theory and the DT/DQ values which indicate that chromium complexes are slightly distorted, whereas those of manganese are severely distorted.
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Singh, D.P., Rana, V.B. Dinuclear trivalent chromium, manganese, iron and cobalt complexes bridged by aromatic diamines. Transition Met Chem 11, 23–26 (1986). https://doi.org/10.1007/BF01064496
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DOI: https://doi.org/10.1007/BF01064496