Iridium(III) cis-Dihydro Complexes with 3,6-Bis(2'-pyridyl)pyridazine. Crystal Structure of the Pyridazinyl Complex 2>PF6

Article abstract of DOI:10.1039/DT9880000651

The complexes X (X = PF6 or SbF6) react with 3,6-bis(2'-pyridyl)pyridazine, dppn, in dichloromethane at 20 or 0 deg C.At 20 deg C the resulting products are the monomolecular species X only, while at 0 deg C, in addition the salts dppn.HX (X = PF6 or SbF6) and the homobinuclear complexes <2<μ-C4H4N)2-3,6>>X form.The structure of the dichloromethane solvate of the latter (X = PF6) has been determined by X-ray diffraction methods.Crystals are triclinic, space group P1, with a = 14.014(4), b = 22.781(8), c = 14.328(3) Angstroem, α = 108.58(4), β = 68.79(percent), γ = 99.04(5) deg, and Z = 2.The structure has been solved from diffractometer data by Patterson and Fourier methods and refined by full-matrix least squares to R = 0.052 for 6725 observed reflections.The structure consists of binuclear cationic complexes, of PF6^- anions, and of dichloromethane molecules of solvation.The cation has imposed C_i symmetry, so that the organic ligand, chelating on its opposite sides both metals through three nitrogen and one carbon atoms, must be disordered and statistically distributed in two positions with the carbon atom bonded to both metals.The distorted octahedral co-ordination around each Ir atom is completed by two P atoms from PPh3 ligands in trans position and by two terminal hydrides in cis positions.

Full text of DOI:10.1039/DT9880000651

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