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[Ir(acac)(2-C8H14)2]: A precursor in the synthesis of cyclometalated iridium(III) complexes

: Böttcher, H.-C.; Graf, M.; Sünkel, K.; Mayer, P.; Krüger, H.


Inorganica Chimica Acta 365 (2011), Nr.1, S.103-107
ISSN: 0020-1693
Fraunhofer IAP ()

A new convenient synthesis and the crystallographic characterization of [Ir(acac)(coe)2] (2, acac = acetylacetonato; coe = cis-cyclooctene) are described. The title compound crystallized from THF/ethanol in two modifications (monoclinic P21/c, 2a, and triclinic P1, 2b). Complex 2 represents an efficient starting material in the synthesis of mononuclear iridium(III) complexes containing cyclometalated 2-phenylpyridinato ligands using oxidative addition reactions of the corresponding ligands towards 2. Thus [Ir(acac)(ppy)2] (3, ppy = 2-phenylpyridinato) and [Ir(ppy)3] (4) (mer, 4a; fac, 4b) were prepared in excellent yields and short reaction times in a kind of one-pot procedure starting from [{Ir(-Cl)(coe)2}2] (1). Furthermore a convenient synthesis of [{Ir(-Cl)(ppy)2}2] (5) from 1 and Hppy is described.