Iridium organometallic compounds

Organometallic Compounds. The predominant oxidation states of indium in organometalUcs are +1 and +3. Iridium forms mononuclear and polynuclear carbonyl complexes including [IrCl(P(C3H3)3)2(CO)2] [14871-41-1], [Ir2014(00)2] [12703-90-1], [Ir4(CO)22] [18827-81 -1], and the conducting, polymeric [IrCl(CO)3] [32594-40-4]. Isonitnle and carbene complexes are also known. 

R. S. Dickson, Organometallic Chemistry of Rhodium and Iridium, Academic Press, New York, 1983, 432 pp. C. White, Organometallic Compounds of Cobalt, Rhodium and Iridium, Chapman Hall, London 1985, 296 pp. 

Organometallic compounds, 14 550-551 25 71. See also Organometallics carbides contrasted, 4 648 as initiators, 14 256-257 iridium, 19 649-650 molybdenum(III), 17 27 osmium, 19 642-643 palladium, 19 652 platinum, 19 656-657 reaction with carbonyl groups, 10 505-506 rhodium, 19 645-646 ruthenium, 19 639 sodium in manufacture of, 22 777 titanium(IV), 25 105-120 Organometallic fullerene derivatives,... 

An interesting study of the electron affinity of different ligands as well as comparisons between inner and outer ligands in iridium-complexes was reported by W. Nefedow, 45) demonstrating clearly that XPS can furnish a lot of valuable information on transition metal complexes and organometallic compounds in general. 

Keywords Emission quantum yields High-resolution spectroscopy Iridium complexes OLED emitters Organometallic compounds Phosphorescence Photophysics Platinum complexes Radiative rates Spin-orbit coupling Triplet emitters Zero-field splitting SOC ZFS SOC and geometry SOC paths... 

There have been a number of reports of indirect coupling constants to carbon in organometallic compounds (see Tables XXXI and XXXII). Several trends are discernible. For transition metal complexes, the trends in V(i3C—M—3ip) and (i C—M— H) appear to follow those observed for V( P—M— H) and V( P—M— P). For complexes of ruthenium, osmium, rhodium, iridium, palladium, and platinum, it is generally found that V(A—M—B) (A, B = P, H) is large when... 

C. White, Organometallic Compounds of Cobalt, Rhodium, and Iridium , Chapman and Hall, New York, 1985. 

A. Segnitz, Organometallic Compounds of Cobalt, Rhodium, Iridium, Nickel, Palladium, Houben-Weyl Methods of Organic Chemistry , 4th edn., Houben-Weyl, Stuttgart, Fed. Rep. Ger., 1984, Vol. 13, Pt. 9B, p. 1062. 

Reviews have appeared of the photophysics of molybdenum complexes, primary and secondary processes in organometallic chemistry, flash photolysis of Pe(CO)5 and Cr(CO)g, dinuclear manganese carbonyl compounds, the photochemistry of metal complexes isolated in low temperature matrices, cluster complexes, diene complexes, photoproduction of coordinativeiy unsaturated species containing rhodium or iridium, and redox chemiluminescence of organometallic compounds.Synthetic and metal organic photochemistry in industry has also been reviewed. 

For organometallic compounds, the situation becomes even more complicated because the presence of elements such as platinum, iron, and copper introduces more complex isotopic patterns. In a very general sense, for inorganic chemistry, as atomic number increases, the number of isotopes occurring naturally for any one element can increase considerably. An element of small atomic number, lithium, has only two natural isotopes, but tin has ten, xenon has nine, and mercury has seven isotopes. This general phenomenon should be approached with caution because, for example, yttrium of atomic mass 89 is monoisotopic, and iridium has just two natural isotopes at masses 191 and 193. Nevertheless, the occurrence and variation in patterns of multi-isotopic elements often make their mass spectrometric identification easy, as depicted for the cases of dimethylmercury and dimethylplatinum in Figure 47.4. 

Use of reducing agent The starting materials for the synthesis of organometallic compounds which are readily available are halides, acetylacetonates etc. In many cases it is necessary to include a reducing agent to remove the halide and to provide electrons to the metal centre (p. 166). For rhodium and iridium, the reducing medium is provided by an alcohol. 

Dimethyleneoctahydronaphthalene has been polymerized by a great variety of Ziegler-Natta and ROMP catalysts based on transition metal salts of titanium, zirconium, vanadium, molybdenum, tungsten, ruthenium, iridium, osmium, platinum or palladium and organometallic compounds [159]. Depending on the catalyst employed, addition or ring-opened polymers were preferentially formed [Eqs. (99) and (100)]. 

A great number of norbornene-like monomers [e.g., m = 1-3, R] and R2 = alkyl and aryl groups, Eqs. (103) and (104)] with or without substituents have been employed in polymerization reactions induced by Ziegler-Natta and ROMP catalysts derived from ruthenium, osmium, iridium, palladium, platinum, molybdenum, and tungsten halides or vanadium and zirconium halides or acetylacetonate associated with organometallic compounds [162, 163]. Both addition and ring-opened polymers have been obtained by this way depending on the catalyst employed [Eqs. (103) and (104)]. 

Organometallic compounds such as [Cp Ir(0H2)3]S04 can be precursors for electrodeposition of a heterogeneous hydrated iridium oxide material that is an excellent electrocatalyst for water oxidation to O2. The deposit is not formed from standard Ir salts and may consist of small (Ir02) clusters n = 2,3) held together by carboxylate ligands formed in the oxidative degradation of Cp. ... 

IV-Methylpyrrole with (Cp IrH3)2 and 3,3-dimethyl-1-butene gives a couple of unique organometallic products, 86 and 87 (990M134). In 86, the C—H bond in position 2 is activated and a rare tiVC) ti (C=C) coordination mode is realized. Species 87 is a zwitterionic compound containing a triple bond between the iridium atoms. 

Y. Wang, N. Herron, V.V. Grushin, D. LeCloux, and V. Petrov, Highly efficient electroluminescent materials based on fluorinated organometallic iridium compounds, Appl. Phys. Lett., 79 449-451 (2001). 

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