Synthesis and structure of dicarbonylbis(.eta.-pentamethylcyclopentadienyl)diiridium

Ball, Richard G.; Graham, W. A. G.; Heinekey, D. Michael; Hoyano, James K.; McMaster, A. D.; Mattson, Bruce; Michel, Suzanne

doi:10.1021/ic00335a051

Cited by 226 publications

(131 citation statements)

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“…As outlined in Scheme 4, the crucial initial step is the synthesis of the mono-and binuclear bis(cyc1ooctene)rhodium compounds 14 and 15, which are obtained in moderate (14) to good (15) The synthesis of the mixed-metal compound 17 (Scheme 5) is based on the metalation of the precursor 15 with nBuLi at low temperature in hexane followed by treatment of the lithium derivative with [IrC1(C8Hl4),], in THF. After chromatographic work-up, the rhodium-iridium complex 17 was isolated in 57% yield.…”

Section: Resultsmentioning

confidence: 99%

Novel binuclear doubly vinyl-bridged iridium complexes formed by olefinic C—H activation

Werner¹,

Wolf²,

Nessel³

et al. 1995

Can. J. Chem.

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Section: Resultsmentioning

confidence: 99%

Novel binuclear doubly vinyl-bridged iridium complexes formed by olefinic C—H activation

Werner¹,

Wolf²,

Nessel³

et al. 1995

Can. J. Chem.

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“…All 1 H and 13 C{ 1 H} NMR spectra were recorded at room temperature on Bruker or Varian spectrometers and chemical shifts were referenced to SiMe 4 for organic solvents and to the temperature-corrected residual DHO peak in aqueous experiments ( in ppm, J in Hz). The ligand precursors L4 and L6, 24 the precursor compounds 2-(1-methyl-1H-1,2,3-triazol-4-yl)pyridine, 24 2-(1-phenyl-1H-1,2,3-triazol-4-yl)pyridine, 24 5-methyl-1-phenyl-1H-1,2,3-triazole, 77 [Cp*IrCl 2 ] 2 , 78 and the complexes 9 and 10 28 were prepared according to literature procedures. All other reagents were purchased from commercial sources and were used as received.…”

Section: Experimental Section Generalmentioning

confidence: 99%

Carbene iridium complexes for efficient water oxidation: scope and mechanistic insights

Woods

Lalrempuia

Petronilho

et al. 2014

Energy Environ. Sci.

105

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Iridium complexes of Cp* and mesoionic carbene ligands were synthesized and evaluated as potential water oxidation catalysts using cerium ammonium nitrate as a chemical oxidant. Performance was evaluated by turnover frequency at 50% conversion and by absolute turnover number, and the most promising precatalysts were subjected to further study. Molecular turnover frequencies varied from 190 to 451 per hour with a maximum turnover number of 38,000. While the rate of oxygen evolution depends linearly on iridium concentration, 10 concurrent spectroscopic and manometric monitoring of stoichiometric additions of oxidant suggests oxygen evolution occurs as two sequential first order reactions. Under the conditions herein, the oxygen evolving species appears to be well defined and molecular based on the kinetic effects of careful ligand design, reproducibility, and the absence of persistent dynamic light scattering signals. Outside of these conditions, the complex mechanism is highly dependent on reaction conditions. While confident characterization of the catalytically active species is difficult, especially under high-turnover conditions, this work indicates IrOx is not essential for the 15 formation of catalytically active water oxidation species.

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“…3,4 Nowadays, efficiency of PSCs has broadly surpassed 17%, 5 and many groups worldwide are in a competition to reach higher efficiencies and stabilities. A wide series of strategies have been reported for this purpose, which mainly consist in: (i) using different mixture of halides precursors; 3,[6][7][8][9] (ii) exchanging the organic cation methylammonium (MA) 7,10,11 by other organic or inorganic cations; 7,10,12 or (iii) using different selective contacts, especially hole transporter material (HTM). 13,14 Precisely, the use of new materials or modifications as HTM is a very large field to be explored.…”

confidence: 99%

“…In order to evaluate the effect of an Ir complex as a new additive for spiro-OMeTAD in perovskites devices, we first studied the effect of IrCl 3 (commercial available, Aldrich), [IrCp*Cl 2 ] 2 , 6 and the water oxidation catalysts IrCp*(H 2 O) 3 [SO 4 ]. 21 None of these iridium species showed any enhancement of the cell's performance.…”

confidence: 99%

New iridium complex as additive to the spiro-OMeTAD in perovskite solar cells with enhanced stability

Badia¹,

Mas‐Marzá²,

Sánchez³

et al. 2014

APL Materials

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A new iridium complex, IrCp*Cl(PyPyz)[TFSI], has been synthesized and used as additive for the hole transporter material, spiro-OMeTAD, in perovskite solar cells. The cells prepared with this Ir additive present higher efficiency than reference cells, and similar to cells prepared with Co additive. We have determined that the presence of metal complexes as additives decreases the recombination rate, as it has been observed by impedance spectroscopy. Very interestingly, while the efficiency after 3 months decreases by 22% and 70% for reference cell and cell with Co additive, respectively, the efficiency of devices containing the Ir additive is only decreased by a 4%.

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Synthesis and structure of dicarbonylbis(.eta.-pentamethylcyclopentadienyl)diiridium

Cited by 226 publications

References 1 publication

Novel binuclear doubly vinyl-bridged iridium complexes formed by olefinic C—H activation

Novel binuclear doubly vinyl-bridged iridium complexes formed by olefinic C—H activation

Carbene iridium complexes for efficient water oxidation: scope and mechanistic insights

New iridium complex as additive to the spiro-OMeTAD in perovskite solar cells with enhanced stability

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