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The crystal structures of tris-[9,9-dihexyl-2-(5-meth-oxy-pyridin-2-yl-κ N )-9 H -fluoren-3-yl-κ C  3 ]iridium pentane monosolvate, [Ir(C 31 H 38 NO) 3 ]·C 5 H 12 , (I), di-μ 2 -chlorido-bis-{bis-[2-(5-fluoro-pyridin-2-yl)-9,9-dihexyl-9 H -fluoren-3-yl]iridium} pentane 0.3-solvate, [Ir 2 (C 30 H 35 FN) 4 Cl 2 ]·0.3C 5 H 12 , (II), di-μ 2 -cyanato-bis-{bis-[9,9-dihexyl-2-(5-meth-oxy-pyridin-2-yl)-9 H -fluoren-1-yl]iridium} pentane monosolvate, [Ir 2 (C 31 H 38 NO) 4 (NCO) 2 (NCO) 2 ]·C 5 H 12 , (III), and {μ- N , N '-bis-[3,5-bis-(tri-fluoro-meth-yl)phen-yl]oxamidato}bis(bis{2-[4-(2,4,6-trimethylphenyl)pyridin-2-yl]phenyl-κ 2  C  1 , N '}iridium)-chloro-benzene-pentane (1/2.3/0.4), [Ir 2 (C 20 H 19 N) 4 (C 18 H 6 F 12 N 2 O 2 )]·2.3C 6 H 5 Cl·0.4C 5 H 12 , (IV), synthesized in the quest for organic light-emitting devices, were determined. The bis-μ 2 -chloro and bis-μ 2 -cyanato complexes have ΔΔ and ΛΛ configurations of the distorted octa-hedral Ir centres in racemic crystals, whereas the oxamido complex has a centrosymmetric ( meso ) structure with the ΔΛ configuration. The bridging oxamido moiety has a nearly planar anti geometry. All structures show substantial disorder of both host mol-ecules and solvents of crystallization.

acta crystallographica. section e, crystallographic communications

Phosphorescent mono- and diiridium(III) complexes cyclometalated by fluorenyl- or phenyl-pyridino ligands with bulky substituents, as prospective OLED dopants