Abstract
The preparation and spectroscopic characterization of osmium tetra(p-tolyl)porphyrin complexes, Os(TTP)LL′ (2c-21; L or L′ = CO, N2, EtOH, THF, Py, PPh3, P(OMe)3, methoxide or oxide) are described. 2c-21 are compared with the analogous octaethylporphyrin complexes, 1c-11. In 2c-21, the porphyrin ligand is a stronger π-acceptor than in 1c-11. The π-acceptor capacity of the porphyrin ligand renders the dinitrogenosmium(II) porphyrins 1j or 2j less stable than the dinitrogenpentammineosmium(II) cation.
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