Pyrazolato-iridium(III) complexes

Article abstract of DOI:10.1016/0022-328X(94)88020-4

The preparation of new mononuclear and dinuclear compounds is reported.The complex BF4 (1) reacts with several donors, yielding the mononuclear complexes BF4 (L=CO (2), P(OMe)3 (3), CH3CN (4) or Hpz (9)).Treatment of 9 with a methanol solution of KOH affords (10) from which the pyrazolate ligand can be displaced by chlorine (14) or acetate (19) groups.Treatment of 3, 10, 14 or 19 with the dimers 4-diolefin)2> (M=Rh or Ir; diolefin=cycloocta-1,5-diene or tetrafluorobenzobarrelene) leads to the heterodinuclear compounds containing the moiety Ir(μ-X)(μ-pz)M M=Rh or Ir; X=H, pz, Cl or OCOCH3).The reaction of 1 with KOH affords the homodinuclear complex <2> (7), which upon treatment with a stoichiometric amount of HBF4 in diethyl ether gives BF4 (8). Key words: Iridium; Pyrazolate; Rhodium