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Iridium cyclometallated

Phenyl- and 2-naphthylbenzothiazole with iridium(III) chloride give cyclometallated derivatives of the type 54 containing two chloride bridging ligands (01IC1704). [Pg.202]

In the rhodium and iridium complexes, the C-coordination, carbene function, and cyclometallated cases prevail. Benzothiazole-2-thione was studied extensively as a ligand and various situations of the exocyclic S-monodentate coordination as well as N,S-combinations in the di-, tri-, and tetranuclear species were discovered. [Pg.212]

Sortais J-B, Pannetier N, Holuigue A, Barloy L, Sirlin C, Pfeffer M, Kyritsakas N (2007) Cyclometalation of primary benzyl amines by ruthenium(II), rhodium(III), and iridium(III) complexes. Organometallics 26 1856-1867... [Pg.330]

S. Lamansky, P. Djurovich, D. Murphy, F. Abdel-Razzaq, H.-E. Lee, C. Adachi, P.E. Burrows, S.R. Forrest, and M.E. Thompson, Highly phosphorescent te-cyclometalated iridium complexes synthesis, photophysical characterization, and use in organic light emitting diodes, J. Am. Chem. Soc., 123 4304—4312 (2001). [Pg.408]

K. Dedeian, J. Shi, N. Shepherd, E. Forsythe, and D.C. Morton, Photophysical and electrochemical properties of heteroleptic tris-cyclometalated Iridium(III) complexes, Inorgan. Chem., 44 4445-4447 (2005). [Pg.410]

W Zhu, M Zhu, Y Ke, L Su, M Yuan, and Y Cao, Synthesis and red electrophosphorescence of a novel cyclometalated iridium complex in polymer light-emitting diodes, Thin Solid Films, 446 128-131, 2004. [Pg.448]

X Chen, J Liao, Y Liang, MO Ahmed, H Tseng, and S Chen, High-efficiency red-light emission from polyfluorenes grafted with cyclometalated iridium complexes and charge transport moiety, J. Am. Chem. Soc., 125 636-637, 2003. [Pg.449]

The ruthenium(II) polypyridyl complexes are also popular but the brightnesses do not exceed 15,000 and thermal quenching is rather significant. This property can be utilized to design temperature-sensitive probes providing that the dyes are effectively shielded from oxygen (e.g., in polyacrylonitrile beads). Despite often very high emission quantum yields the visible absorption of cyclometallated complexes of iridium(III) and platinum(II) is usually poor (e < 10,000 M-1cm-1), thus,... [Pg.198]

Borisov SM, Klimant I (2007) Ultrabright oxygen optodes based on cyclometalated Iridium (III) coumarin complexes. Anal Chem 79 7501-7509... [Pg.226]

Highly enantioselective variants of these processes employ a cyclometallated iridium C,0-benzoate derived from allyl acetate, w-nitrobenzoic acid, and... [Pg.119]

More recently, using the cyclometallated iridium C,(7-benzoate derived from allyl acetate, 4-methoxy-3-nitrobenzoic acid and BIPHEP, catalytic carbonyl crotylation employing 1,3-butadiene from the aldehyde, or alcohol oxidation was achieved under transfer hydrogenation conditions [274]. Carbonyl addition occurs with roughly equal facility from the alcohol or aldehyde oxidation level. However, products are obtained as diastereomeric mixtures. Stereoselective variants of these processes are under development. It should be noted that under the conditions of ruthenium-catalyzed transfer hydrogenation, conjugated dienes, including butadiene, couple to alcohols or aldehydes to provide either products of carbonyl crotylation or p,y-enones (Scheme 16) [275, 276]. [Pg.122]

The BINAP derivative of the ort/io-cyclometallated iridium catalyst has been characterized by single crystal X-ray diffraction analysis [280]. Remarkably, although the reaction sequence depends upon oxidation of either the reactant alcohol or isopropanol, the enantiomeric purity of the homoallylic alcohol product... [Pg.124]

A wide range of carbon, nitrogen, and oxygen nucleophiles react with allylic esters in the presence of iridium catalysts to form branched allylic substitution products. The bulk of the recent literature on iridium-catalyzed allylic substitution has focused on catalysts derived from [Ir(COD)Cl]2 and phosphoramidite ligands. These complexes catalyze the formation of enantiomerically enriched allylic amines, allylic ethers, and (3-branched y-8 unsaturated carbonyl compounds. The latest generation and most commonly used of these catalysts (Scheme 1) consists of a cyclometalated iridium-phosphoramidite core chelated by 1,5-cyclooctadiene. A fifth coordination site is occupied in catalyst precursors by an additional -phosphoramidite or ethylene. The phosphoramidite that is used to generate the metalacyclic core typically contains one BlNOLate and one bis-arylethylamino group on phosphorus. [Pg.170]

Concurrent with studies on cyclometalation, studies on the effects of the structure of phosphoramidite ligand had been conducted. Several groups studied the effect of the stmcmre of ligand on the rate and selectivity of these iridium-catalyzed allylic substitutions. LI contains three separate chiral components - the two phenethyl moieties on the amine as well as the axially chiral BINOL backbone. These portions of the catalyst structure can control reaction rates by affecting the rate of cyclometalation, by inhibiting catalyst decomposition, or by forming a complex that reacts faster in the mmover-limiting step(s) of the catalytic cycle. [Pg.185]

A special type of reaction is observed with the platinum(IV) complex [PtI(Me)3] which cleaves the Af,N,Af, A -tetraphenyltetraaminoethylene under reduction to form the dimeric cyclometallated mono(NHC) complex of platinum(II) iodide [Eq. (31)]. Cyclometallation with the same ligand is also observed for ruthe-nium. Additional cyclometallations with various substituents of NHCs have been reported for ruthenium(II), rhodium(III), iridium(I), palladium(II), " and platinum(II). In the case of iridium, alkyl groups can be activated twice. In rare cases like for nickel(II) /x-bridging NHCs have been obtained. ... [Pg.25]

Alkyl-2-phenyl-5(4//)-oxazolones 342 react with the chloro-bridged iridium(III) complex [(t -C5Me5)IrCl2]2 to give cyclometalated mononuclear complexes 343. [Pg.204]

Extremely high ECL efficiencies seem to be a common feature of the homoleptic-IrL3 as well as the heteroleptic-L2Ir(X) iridium(III) cyclometallated complexes. Extremely high ECL efficiencies (up to 0.55) were observed via ion annihilation between the electrochemically generated L2Ir(acac)+ or L2Ir(pico) + cations (where... [Pg.487]

AN IRIDIUM(III) COMPLEX CONTAINING CYCLOMETALLATED TRIPHENYLPHOSPHINE FORMED BY ISOMERIZATION OF AN IRIDIUM(I) TRIPHENYLPHOSPHINE COMPLEX... [Pg.200]


See other pages where Iridium cyclometallated is mentioned: [Pg.211]    [Pg.133]    [Pg.133]    [Pg.87]    [Pg.708]    [Pg.120]    [Pg.149]    [Pg.149]    [Pg.697]    [Pg.426]    [Pg.408]    [Pg.409]    [Pg.409]    [Pg.412]    [Pg.446]    [Pg.535]    [Pg.198]    [Pg.6]    [Pg.124]    [Pg.126]    [Pg.130]    [Pg.169]    [Pg.187]    [Pg.34]    [Pg.69]    [Pg.203]    [Pg.189]    [Pg.117]    [Pg.2105]   
See also in sourсe #XX -- [ Pg.261 ]

See also in sourсe #XX -- [ Pg.30 , Pg.143 , Pg.147 ]




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Cyclometalations

Cyclometallation

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