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Journal articles on the topic 'Iridium modifier'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Rademeyer, Cornelius J., Bernard Radziuk, Natalia Romanova, Nils Petter Skaugset, Asbj�rn Skogstad, and Yngvar Thomassen. "Permanent iridium modifier for electrothermal atomic absorption spectrometry." Journal of Analytical Atomic Spectrometry 10, no. 10 (1995): 739. http://dx.doi.org/10.1039/ja9951000739.

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2

Kot, Monika, Robert Wojcieszak, Ewa Janiszewska, Mariusz Pietrowski, and Michał Zieliński. "Effect of Modification of Amorphous Silica with Ammonium Agents on the Physicochemical Properties and Hydrogenation Activity of Ir/SiO2 Catalysts." Materials 14, no. 4 (February 18, 2021): 968. http://dx.doi.org/10.3390/ma14040968.

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The modification of commercial silica with solutions of NH4F or NH4Cl salts, followed by thermal treatment, enabled generation of the acidic sites in SiO2 and changed its textural properties. The use of ammonium salts solution also caused the generation of additional porosity. Using NH4F solution caused significant decrease in the specific surface area and the increase in the average pore diameter. The number and strength of resulting acid sites depend on the nature of anion in the applied ammonium salt and the concentration of salt solution. It has been found that the sample treated with NH4F presented higher total acidity (TPD–NH3) and the amount as well as the strength of acid sites increased with the concentration of the used modifier. As modified amorphous SiO2 materials used as a support for iridium (1 wt %, Ir(acac)3) nanoparticles permitted to obtain highly active catalysts for toluene hydrogenation under atmospheric pressure. The highest activity (expressed as the apparent rate and TOF) was obtained for iridium catalysts supported on silica modified by NH4F with the highest acidity. The modification of silica with NH4F favors the generation of centers able to adsorb toluene, which results in higher activity of this catalyst.

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3

Bulska, Ewa, Marek Piaścik, and Krystyna Pyrzyńska. "Iridium Modifier for Determination of Selenium by Graphite Furnace Atomic Absorption Spectrometry." Analytical Letters 33, no. 7 (January 2000): 1399–408. http://dx.doi.org/10.1080/00032710008543130.

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4

Pandey, Rina, Ju Won Lim, Jung Hyuk Kim, Basavaraj Angadi, Ji Won Choi, and Won Kook Choi. "Performance enhancement in organic photovoltaic solar cells using iridium (Ir) ultra-thin surface modifier (USM)." Applied Surface Science 444 (June 2018): 97–104. http://dx.doi.org/10.1016/j.apsusc.2018.03.012.

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5

Hou, Xiandeng, Zheng Yang, and Bradley T. Jones. "Determination of selenium by tungsten coil atomic absorption spectrometry using iridium as a permanent chemical modifier." Spectrochimica Acta Part B: Atomic Spectroscopy 56, no. 2 (February 2001): 203–14. http://dx.doi.org/10.1016/s0584-8547(00)00305-0.

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6

Piaścik, Marek, and Ewa Bulska. "Performance of permanent iridium modifier in the presence of corrosive matrix in graphite furnace atomic absorption spectrometry." Fresenius' Journal of Analytical Chemistry 371, no. 8 (October 27, 2001): 1079–82. http://dx.doi.org/10.1007/s00216-001-1107-8.

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7

Grinberg, Patricia, and Reinaldo Calixto de Campos. "Iridium as permanent modifier in the determination of lead in whole blood and urine by electrothermal atomic absorption spectrometry." Spectrochimica Acta Part B: Atomic Spectroscopy 56, no. 10 (October 2001): 1831–43. http://dx.doi.org/10.1016/s0584-8547(01)00162-8.

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8

MEERAVALI, Noorbasha N., M. A. REDDY, and Sunil Jai KUMAR. "Cloud Point Extraction of Trace Metals from Seawater and Determination by Electrothermal Atomic Absorption Spectrometry with Iridium Permanent Modifier." Analytical Sciences 23, no. 3 (2007): 351–56. http://dx.doi.org/10.2116/analsci.23.351.

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9

de Amorim, Flávia Regina, Clésia Cristina Nascentes, Milton Batista Franco, and José Bento Borba da Silva. "Fast Determination of Manganese in Milk and Similar Infant Food Samples Using Multivariate Optimization and GF AAS." International Journal of Spectroscopy 2011 (October 13, 2011): 1–7. http://dx.doi.org/10.1155/2011/810641.

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Manganese is an essential element, but high levels in foods can be toxic mainly for children. A fast and efficient method to determine Mn in milk and other infant foods using slurries and liquid samples is presented. Slurries were prepared in ultrapure water with 10 minutes of sonication. Liquid samples were diluted in ultrapure water when necessary. Multivariate optimization was used to establish some optimal analytical parameters through a fractional factorial design and a central composite design. Slurred and diluted samples were analyzed directly by GF AAS. The method presented limit of detection of (0.98±0.04) μg L−1, characteristic mass of (2.9±0.3) pg (recommended value 2 pg), RSD of 2.3% (n=5), and linear range from 0.98 to 20.0 μg L−1 using iridium as permanent modifier. The accuracy was evaluated analyzing two certified reference materials: nonfat milk powder (SRM1549) and whole milk powder (SRM8435). The powdered samples concentrations were between 0.210 and 26.3 μg g−1.

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10

Borges, Daniel L. G., Lúcia F. Dias, Márcia A. M. S. da Veiga, and Adilson J. Curtius. "Determination of cadmium in sediments and in sewage sludge by slurry sampling electrothermal atomic absorption spectrometry using iridium as permanent modifier." Journal of the Brazilian Chemical Society 14, no. 2 (April 2003): 291–96. http://dx.doi.org/10.1590/s0103-50532003000200017.

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11

Slaveykova, Vera I., Leonardo Lampugnani, Dimiter L. Tsalev, L. Sabbatini, and Elvira De Giglio. "Permanent iridium modifier deposited on tungsten and zirconium-treated platforms in electrothermal atomic absorption spectrometry: vaporization of bismuth, silver and tellurium." Spectrochimica Acta Part B: Atomic Spectroscopy 54, no. 3-4 (April 1999): 455–67. http://dx.doi.org/10.1016/s0584-8547(98)00244-4.

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12

Uggerud, Hilde Th, and Walter Lund. "Modifier effects from palladium and iridium in the determination of arsenic and antimony using electrothermal vaporisation inductively coupled plasma mass spectrometry." Spectrochimica Acta Part B: Atomic Spectroscopy 54, no. 11 (November 1999): 1625–36. http://dx.doi.org/10.1016/s0584-8547(99)00093-2.

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13

Cassella, Ricardo J., Bruno Alberto R. S. Barbosa, Ricardo E. Santelli, and Alessandra T. Rangel. "Direct determination of arsenic and antimony in naphtha by electrothermal atomic absorption spectrometry with microemulsion sample introduction and iridium permanent modifier." Analytical and Bioanalytical Chemistry 379, no. 1 (May 1, 2004): 66–71. http://dx.doi.org/10.1007/s00216-004-2500-x.

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14

Grinberg, Patricia, Reinaldo C. Campos, and Ralph E. Sturgeon. "Iridium as a permanent modifier for determination of cadmium and lead in sediment and biological samples by furnace atomization plasma emission spectrometry." Journal of Analytical Atomic Spectrometry 17, no. 7 (June 18, 2002): 693–98. http://dx.doi.org/10.1039/b203030f.

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15

Marzialetti, T., J. L. G. Fierro, and P. Reyes. "Iridium-supported catalyst for enantioselective hydrogenation of 1-phenyl-1,2-propanedione: The effects of the addition of promoter and the modifier concentration." Catalysis Today 107-108 (October 2005): 235–43. http://dx.doi.org/10.1016/j.cattod.2005.07.094.

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16

Vassileva, Emilia, Herv� Baeten, and Michel Hoenig. "Advantages of the iridium permanent modifier in fast programs applied to trace-element analysis of plant samples by electrothermal atomic absorption spectrometry." Fresenius' Journal of Analytical Chemistry 369, no. 6 (March 15, 2001): 491–95. http://dx.doi.org/10.1007/s002160000676.

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17

Giacomelli, Maria Bertı́lia Oss, José Bento Borba da Silva, Tatiana Dillenburg Saint'Pierre, and Adilson José Curtius. "Use of iridium plus rhodium as permanent modifier to determine As, Cd and Pb in acids and ethanol by electrothermal atomic absorption spectrometry." Microchemical Journal 77, no. 2 (August 2004): 151–56. http://dx.doi.org/10.1016/j.microc.2004.02.009.

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18

Slaveykova, Vera I., Leonardo Lampugnani, Dimiter L. Tsalev, and L. Sabbatini. "Morphological and spectroscopic investigation of the behavior of permanent iridium modifier deposited on pyrolytic graphite coated and zirconium treated platforms in electrothermal atomic absorption spectrometry." Spectrochimica Acta Part B: Atomic Spectroscopy 52, no. 14 (December 1997): 2115–26. http://dx.doi.org/10.1016/s0584-8547(97)00101-8.

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19

Meeravali, Noorbasha N., and Sunil Jai Kumar. "Zirconium–iridium coating as a permanent modifier for determination of tin in stream sediment, oyster tissue and total diet slurries by electrothermal atomic absorption spectrometry." Journal of Analytical Atomic Spectrometry 17, no. 7 (June 17, 2002): 704–9. http://dx.doi.org/10.1039/b201399a.

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20

Tsalev, Dimiter L., Alessandro D'ulivo, Leonardo Lampugnani, Marco di Marco, and Roberto Zamboni. "Thermally stabilized iridium on an integrated, carbide-coated platform as a permanent modifier for hydride-forming elements in electrothermal atomic absorption spectrometry. Part 1. Optimization studies." Journal of Analytical Atomic Spectrometry 10, no. 11 (1995): 1003. http://dx.doi.org/10.1039/ja9951001003.

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21

Jai Kumar, Sunil, M. A. Reddy, and N. N. Meeravali. "Ultrasonic probe extraction of tin from botanical and biological reference materials and determination using end capped electrothermal atomic absorption spectrometry (EC-ETAAS) with zirconium–iridium permanent modifier." J. Anal. At. Spectrom. 20, no. 2 (2005): 124–26. http://dx.doi.org/10.1039/b414871a.

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22

Pasias, Ι. N., Ν. S. Τhomaidis, E. B. Bakeas, and Ε. A. Piperaki. "Application of zirconium–iridium permanent modifier for the simultaneous determination of lead, cadmium, arsenic, and nickel in atmospheric particulate matter by multi-element electrothermal atomic absorption spectrometry." Environmental Monitoring and Assessment 185, no. 8 (January 18, 2013): 6867–79. http://dx.doi.org/10.1007/s10661-013-3071-0.

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23

Tsalev, Dimiter L., Alessandro D'Ulivo, Leonardo Lampugnani, Marco di Marco, and Roberto Zamboni. "Thermally stabilized iridium on an integrated, carbide-coated platform as a permanent modifier for hydride-forming elements in electrothermal atomic absorption spectrometry. Part 3. Effect of L-cysteine." Journal of Analytical Atomic Spectrometry 11, no. 10 (1996): 989. http://dx.doi.org/10.1039/ja9961100989.

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24

Castañeda Martínez, Claudia Patricia, Ignacio Alfonso Alvarado Ortega, Hugo Alfonso Rojas Sarmiento, Francisco Javier Tzompantzi Morales, and José Ricardo Gómez Romero. "Photocatalytic degradation of the 2,4-dichlorophenoxyacetic acid herbicide using supported iridium materials." Ciencia en Desarrollo 12, no. 1 (January 8, 2021): 125–34. http://dx.doi.org/10.19053/01217488.v12.n1.2021.12447.

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In this work, the effect of the addition of iridium on TiO2 and Nb2O5 supports obtained by wet impregnation method was evaluated in the photocatalytic degradation of 2,4-dichlorophenoxiacetic acid under UV irradiation. The synthetized materials were analyzed by different techniques in order to determinate their physicochemical properties. In general, it was observed that the addition of iridium modifies the surface area, band gap energy and it enhances the crystallinity of the materials. Besides, an increase in the photoactivity in the degradation of the herbicide was evidenced using the materials modified. However, the Ir/TiO2 photocatalyst possess the best photocatalytic behavior toward the degradation and possible mineralization of the herbicide. The improved performance of the photocatalyst could be argued by the role of the iridium particles as electron collectors favoring the effective separation of the charge carriers and, as consequence, increasing the degradation of the molecule.

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25

Zieliński, Michał, Monika Kot, Mariusz Pietrowski, Robert Wojcieszak, Jolanta Kowalska-Kuś, and Ewa Janiszewska. "Studies of New Iridium Catalysts Supported on Modified Silicalite-1—Their Structure and Hydrogenating Properties." Materials 14, no. 16 (August 9, 2021): 4465. http://dx.doi.org/10.3390/ma14164465.

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This paper investigates the catalytic properties of the iridium catalysts supported on modified silicalite-1. Post-synthesis modification of silicalite-1, with solutions of ammonium compounds (NH4F and NH4OH), appeared to be an efficient method to generate the acidic sites in starting support. The modification of support led not only to changes in its acidity but also its porosity—formation of additional micro- and mesopores. The novel materials were used as supports for iridium. The iridium catalysts (1 wt.% Ir) were characterized by N2 adsorption/desorption measurements, temperature-programmed reduction with hydrogen (TPR-H2), H2 chemisorption, transmission electron microscopy (TEM), temperature-programmed desorption of ammonia (TPD-NH3), X-ray photoelectron spectroscopy (XPS) and tested in the hydrogenation of toluene reaction. The catalytic activity of iridium supported on silicalite-1 treated with NH4OH (higher porosity of support, better dispersion of active phase) was much higher than that of Ir supported on unmodified and modified with NH4F silicalite-1.

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26

Tsalev, Dimiter L., Alessandro D'Ulivo, Leonardo Lampugnani, Marco di Marco, and Roberto Zamboni. "Thermally stabilized iridium on an integrated, carbide-coated platform as a permanent modifier for hydride-forming elements in electrothermal atomic absorption spectrometry. Part 2. Hydride generation and collection, and behaviour of some organoelement species." Journal of Analytical Atomic Spectrometry 11, no. 10 (1996): 979. http://dx.doi.org/10.1039/ja9961100979.

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27

Chung, Tsai-Wei, Chih-Ning Huang, Po-Chun Chen, Toshihiko Noda, Takashi Tokuda, and Jun Ohta. "Fabrication of Iridium Oxide/Platinum Composite Film on Titanium Substrate for High-Performance Neurostimulation Electrodes." Coatings 8, no. 12 (November 23, 2018): 420. http://dx.doi.org/10.3390/coatings8120420.

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Electrode materials for neural stimulation have been widely investigated for implantable devices. Among them, iridium and iridium oxide are attractive materials for bio-interface applications due to their desirable stability, electrochemical performance, and biocompatibility. In this study, iridium oxide/platinum (IrOx/Pt) composite films were successfully fabricated on titanium substrates by chemical bath deposition and these films are expected to be used as biocompatible stimulation electrodes. We modified the film compositions to optimize the performances. In addition, these IrOx/Pt composite films were characterized before and after annealing by SEM and XRD. We also identified the hydrophilicity of these iridium oxide/platinum composite films by measuring contact angles. Finally, the charge storage capacities of these iridium oxide/platinum composite films were evaluated by an electrochemical workstation. As a result, the charge storage capacities of the iridium oxide/platinum composite films are largely increased, and this leads to a very efficient neurostimulation electrode. Additionally, we successfully demonstrated the chemical bath deposition of IrOx film on the surface of the bullet-shaped titanium microelectrode.

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28

Nicholls, Dylan, and Nuri Oncel. "Iridium-modified Si(111) surface." Journal of Physics: Condensed Matter 25, no. 44 (September 20, 2013): 445004. http://dx.doi.org/10.1088/0953-8984/25/44/445004.

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29

Wu, Yongquan, Guanjie Zeng, Nannan Lvyue, Weihua Wu, Tianyu Jiang, Rongle Wu, Wei Guo, Xun Li, and Xiaolin Fan. "Triethylene glycol-modified iridium(iii) complexes for fluorescence imaging of Schistosoma japonicum." Journal of Materials Chemistry B 5, no. 25 (2017): 4973–80. http://dx.doi.org/10.1039/c7tb00662d.

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30

Siebert, Max, Golo Storch, Frank Rominger, and Oliver Trapp. "Temperature-Controlled Bidirectional Enantioselectivity in Asymmetric Hydrogenation Reactions Utilizing Stereodynamic Iridium Complexes." Synthesis 49, no. 15 (June 20, 2017): 3485–94. http://dx.doi.org/10.1055/s-0036-1588861.

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Stereochemically flexible 2,2(-bis(diphenylphosphino)biphenyl (BIPHEP) ligands were modified with chiral α-substituted carboxylic acid auxiliaries in the 3- and 3′-position. The resulting central-to-axial chirality transfer to the stereochemically flexible chiral axis of the BIPHEP core was investigated as well as complexation of these diastereomeric ligands to iridium(I). Solid-state structures of both ligand diastereomers and a diastereomerically pure iridium(I) BIPHEP complex were obtained. Thermal equilibration of the resulting iridium(I) complexes was studied to investigate the stereodynamic properties of the BIPHEP ligands. The iridium(I) complexes without and after pre-catalysis warming in solution — which induces a shift of the diastereomeric ratio — were applied for asymmetric hydrogenation of a prochiral α-substituted acrylic acid, resulting in temperature-controlled bidirectional enantioselectivity of iridium catalysts for the first time. In both cases, enantioenriched (R)-naproxen as well as (S)-naproxen — after re-equilibration of the catalyst at elevated temperatures — was obtained by using the same catalyst.

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31

Wu, Shaoguang, Youjia Wang, Yuling Zhao, Ruidong Wang, Ma Hailin, and Tianzhi Yu. "Synthesis and luminescence properties of two Ir(iii) complexes containing styrene-modified phenylpyridine ligands." New Journal of Chemistry 45, no. 6 (2021): 3311–18. http://dx.doi.org/10.1039/d0nj05318j.

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32

Na, Hanah, Ayan Maity, and Thomas S. Teets. "Bis-cyclometalated iridium complexes with electronically modified aryl isocyanide ancillary ligands." Dalton Transactions 46, no. 15 (2017): 5008–16. http://dx.doi.org/10.1039/c7dt00694b.

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33

Hess, Dieter, Bernd Hannebauer, Matthias Königa, Matthias Reckers, Stefan Buchholz, and Robert Franke. "Operando Infrared Spectroscopic and Quantum-chemical Studies on Iridium-catalyzed Hydroformylation." Zeitschrift für Naturforschung B 67, no. 10 (October 1, 2012): 1061–69. http://dx.doi.org/10.5560/znb.2012-0157.

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Hydroformylation of 1-butene using a triphenylphosphine-modified iridium catalyst was investigated by operando infrared spectroscopy. The spectra were interpreted by comparison with quantumchemically calculated vibrational spectra at the density functional theory level. The processes during activation of the catalyst and hydroformylation were investigated in detail, and the results are discussed. The recently discovered phenomenon of activity enhancement in iridium-catalyzed hydroformylation by a preceding activation step, in which the reaction mixture is treated with synthesis gas containing an excess of carbon monoxide under pressure, could be correlated with the appearance of a complex HIr(PPh3)(CO)3. The similarities and differences between iridium- and rhodium-catalyzed hydroformylation are discussed.

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34

Zhang, Mei, and Genping Huang. "Mechanism of iridium-catalysed branched-selective hydroarylation of vinyl ethers: a computational study." Dalton Transactions 45, no. 8 (2016): 3552–57. http://dx.doi.org/10.1039/c5dt04973c.

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35

Laha, Paltan, Umasankar De, Falguni Chandra, Niranjan Dehury, Sadhika Khullar, Hyung Sik Kim, and Srikanta Patra. "Alkyl chain-modified cyclometalated iridium complexes as tunable anticancer and imaging agents." Dalton Transactions 47, no. 44 (2018): 15873–81. http://dx.doi.org/10.1039/c8dt02461h.

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36

Zhao, Mengying, Yaping Pan, Xingbo Wang, Xue-Wang Gao, and Duobin Chao. "Nitroolefin-modified cyclometalated iridium(iii) complexes for tunable detection of biothiols with deep-red emission." New Journal of Chemistry 42, no. 7 (2018): 5508–13. http://dx.doi.org/10.1039/c8nj00314a.

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37

Ke, Libing, Cheng Zhang, Xinxing Liao, Kangqiang Qiu, Thomas W. Rees, Yu Chen, Zizhuo Zhao, Liangnian Ji, and Hui Chao. "Mitochondria-targeted Ir@AuNRs as bifunctional therapeutic agents for hypoxia imaging and photothermal therapy." Chemical Communications 55, no. 69 (2019): 10273–76. http://dx.doi.org/10.1039/c9cc05610f.

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38

Gatto, Giordano, Alice De Palo, Ana C. Carrasco, Ana M. Pizarro, Stefano Zacchini, Guido Pampaloni, Fabio Marchetti, and Alceo Macchioni. "Modulating the water oxidation catalytic activity of iridium complexes by functionalizing the Cp*-ancillary ligand: hints on the nature of the active species." Catalysis Science & Technology 11, no. 8 (2021): 2885–95. http://dx.doi.org/10.1039/d0cy02306j.

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39

Sheela, G., Malathy Pushpavanam, and S. Pushpavanam. "A Modified Process for Iridium Electrodeposition." Transactions of the IMF 78, no. 5 (January 2000): 191–93. http://dx.doi.org/10.1080/00202967.2000.11871336.

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40

Ureta-Zañartu, M. Soledad, Patricia Bravo, and José H. Zagal. "Methanol oxidation on modified iridium electrodes." Journal of Electroanalytical Chemistry 337, no. 1-2 (October 1992): 241–51. http://dx.doi.org/10.1016/0022-0728(92)80541-b.

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41

Ma, Wenli, Zhenzhen Tian, Shumiao Zhang, Xiangdong He, JuanJuan Li, Xiaorong Xia, Xiaobing Chen, and Zhe Liu. "Lysosome targeted drugs: rhodamine B modified N^N-chelating ligands for half-sandwich iridium(iii) anticancer complexes." Inorganic Chemistry Frontiers 5, no. 10 (2018): 2587–97. http://dx.doi.org/10.1039/c8qi00620b.

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42

Rimoldi, Martino, Akitake Nakamura, Nicolaas A. Vermeulen, James J. Henkelis, Anthea K. Blackburn, Joseph T. Hupp, J. Fraser Stoddart, and Omar K. Farha. "A metal–organic framework immobilised iridium pincer complex." Chemical Science 7, no. 8 (2016): 4980–84. http://dx.doi.org/10.1039/c6sc01376g.

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An iridium pincer complex has been immobilised in the metal–organic framework NU-1000. The stable Ir-pincer modified NU-1000 is catalytically active in the hydrogenation of alkenes in condensed phase and under flow conditions.

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43

Cheong, Yeon-Joo, Kihyuk Sung, Jin-A. Kim, Yu Kwon Kim, Woojin Yoon, Hoseop Yun, and Hye-Young Jang. "Iridium(NHC)-Catalyzed Sustainable Transfer Hydrogenation of CO2 and Inorganic Carbonates." Catalysts 11, no. 6 (May 31, 2021): 695. http://dx.doi.org/10.3390/catal11060695.

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Iridium(NHC)-catalyzed transfer hydrogenation (TH) of CO2 and inorganic carbonates with glycerol were conducted, demonstrating excellent turnover numbers (TONs) and turnover frequencies (TOFs) for the formation of formate and lactate. Regardless of carbon sources, excellent TOFs of formate were observed (CO2: 10,000 h−1 and K2CO3: 10,150 h−1). Iridium catalysts modified with the triscarbene ligand showed excellent catalytic activity at 200 °C and are a suitable choice for this transformation which requires a high temperature for high TONs of formate. On the basis of the control experiments, the transfer hydrogenation mechanism of CO2 was proposed.

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44

Van Zante, D. E., K. L. Suder, A. J. Strazisar, and T. H. Okiishi. "An Improved Aspirating Probe for Total-Temperature and Total-Pressure Measurements in Compressor Flows." Journal of Turbomachinery 117, no. 4 (October 1, 1995): 642–49. http://dx.doi.org/10.1115/1.2836583.

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The aspirating probe originally designed by Epstein and Ng at MIT was modified by replacing the two platinum-coated tungsten hot wires normally used with platinum–iridium alloy wires. The resulting improved unsteady total pressure and total temperature resolution of the modified probe is demonstrated. Flowfield measurements were made downstream of NASA Rotor 37 for a part-speed operating condition to test the performance of the probe. Time-resolved blade-to-blade total temperature and total pressure as calculated from the two platinum–iridium hot-wire voltages are shown. The flowfield measurements are compared with independent measurements of total pressure with high response transducers and total temperature calculated from laser anemometer measurements. Limitations of a more often used unsteady temperature data reduction method, which involves only one aspirating probe hot-wire voltage and a high-response pressure measurement, are discussed.

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45

Tso, Karson Ka-Shun, Kam-Keung Leung, Hua-Wei Liu, and Kenneth Kam-Wing Lo. "Photoactivatable cytotoxic agents derived from mitochondria-targeting luminescent iridium(iii) poly(ethylene glycol) complexes modified with a nitrobenzyl linkage." Chemical Communications 52, no. 24 (2016): 4557–60. http://dx.doi.org/10.1039/c6cc00918b.

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46

Akramipour, Reza, Mohammad Reza Golpayegani, Mahmoud Ghasemi, Negar Noori, and Nazir Fattahi. "Development of an efficient sample preparation method for the speciation of Se(iv)/Se(vi) and total inorganic selenium in blood of children with acute leukemia." New Journal of Chemistry 43, no. 18 (2019): 6951–58. http://dx.doi.org/10.1039/c9nj00979e.

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In this study, a new solidified deep eutectic solvent microextraction (SDES-ME) method was applied for the speciation of Se(iv), Se(vi) and total inorganic selenium in the blood of children with leukemia from Kermanshah, Iran, prior to analysis by iridium-modified tube graphite furnace atomic absorption spectrometry (GFAAS).

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47

Xian, Yuezhong, Wenliang Sun, Jian Xue, Min Luo, and Litong Jin. "Iridium oxide and palladium modified nitric oxide microsensor." Analytica Chimica Acta 381, no. 2-3 (February 1999): 191–96. http://dx.doi.org/10.1016/s0003-2670(98)00765-x.

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48

Kim, Min-Chul, and Sang-Yup Lee. "Catalytic Water Oxidation by Iridium-Modified Carbonic Anhydrase." Chemistry - An Asian Journal 13, no. 3 (January 17, 2018): 334–41. http://dx.doi.org/10.1002/asia.201701543.

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49

Yang, Dong, Mohammad R. Momeni, Hakan Demir, Dale R. Pahls, Martino Rimoldi, Timothy C. Wang, Omar K. Farha, et al. "Tuning the properties of metal–organic framework nodes as supports of single-site iridium catalysts: node modification by atomic layer deposition of aluminium." Faraday Discussions 201 (2017): 195–206. http://dx.doi.org/10.1039/c7fd00031f.

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Abstract:

The metal–organic framework NU-1000, with Zr₆-oxo, hydroxo, and aqua nodes, was modified by incorporation of hydroxylated Al(iii) ions by ALD-like chemistry with [Al(CH₃)₂(iso-propoxide)]₂ followed by steam (ALD = atomic layer deposition). Al ions were installed to the extent of approximately 7 per node. Single-site iridium diethylene complexes were anchored to the nodes of the modified and unmodified MOFs by reaction with Ir(C₂H₄)₂(acac) (acac = acetylacetonate) and converted to Ir(CO)₂ complexes by treatment with CO. Infrared spectra of these supported complexes show that incorporation of Al weakened the electron donor tendency of the MOF. Correspondingly, the catalytic activity of the initial supported iridium complexes for ethylene hydrogenation increased, as did the selectivity for ethylene dimerization. The results of density functional theory calculations with a simplified model of the nodes incorporating Al(iii) ions are in qualitative agreement with some catalyst performance data.

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50

Gatto, Giordano, Alceo Macchioni, Roberto Bondi, Fabio Marmottini, and Ferdinando Costantino. "Post Synthetic Defect Engineering of UiO-66 Metal–Organic Framework with An Iridium(III)-HEDTA Complex and Application in Water Oxidation Catalysis." Inorganics 7, no. 10 (October 10, 2019): 123. http://dx.doi.org/10.3390/inorganics7100123.

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Abstract:

Clean production of renewable fuels is a great challenge of our scientific community. Iridium complexes have demonstrated a superior catalytic activity in the water oxidation (WO) reaction, which is a crucial step in water splitting process. Herein, we have used a defective zirconium metal–organic framework (MOF) with UiO-66 structure as support of a highly active Ir complex based on EDTA with the formula [Ir(HEDTA)Cl]Na. The defects are induced by the partial substitution of terephthalic acid with smaller formate groups. Anchoring of the complex occurs through a post-synthetic exchange of formate anions, coordinated at the zirconium clusters of the MOF, with the free carboxylate group of the [Ir(HEDTA)Cl]− complex. The modified material was tested as a heterogeneous catalyst for the WO reaction by using cerium ammonium nitrate (CAN) as the sacrificial agent. Although turnover frequency (TOF) and turnover number (TON) values are comparable to those of other iridium heterogenized catalysts, the MOF exhibits iridium leaching not limited at the first catalytic run, as usually observed, suggesting a lack of stability of the hybrid system under strong oxidative conditions.

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