Relevant bibliographies by topics / Rh(I) chemistry]

Academic literature on the topic 'Rh(I) chemistry]'

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Published: 9 March 2023

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Journal articles on the topic "Rh(I) chemistry]"

1

Dickson, Ron S. "Alkyne rotation on a RhRh bond: An entry to diverse chemistry." Polyhedron 10, no. 17 (January 1991): 1995–2023. http://dx.doi.org/10.1016/s0277-5387(00)86026-x.

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Yusenko, Kirill V., Aleksandr S. Sukhikh, Werner Kraus, and Sergey A. Gromilov. "Synthesis and Crystal Chemistry of Octahedral Rhodium(III) Chloroamines." Molecules 25, no. 4 (February 11, 2020): 768. http://dx.doi.org/10.3390/molecules25040768.

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Rhodium(III) octahedral complexes with amine and chloride ligands are the most common starting compounds for preparing catalytically active rhodium(I) and rhodium(III) species. Despite intensive study during the last 100 years, synthesis and crystal structures of rhodium(III) complexes were described only briefly. Some [RhClx(NH3)6-x] compounds are still unknown. In this study, available information about synthetic protocols and the crystal structures of possible [RhClx(NH3)6−x] octahedral species are summarized and critically analyzed. Unknown crystal structures of (NH4)2[Rh(NH3)Cl5], trans–[Rh(NH3)4Cl2]Cl⋅H2O, and cis–[Rh(NH3)4Cl2]Cl are reported based on high quality single crystal X-ray diffraction data. The crystal structure of [Rh(NH3)5Cl]Cl2 was redetermined. All available crystal structures with octahedral complexes [RhClx(NH3)6-x] were analyzed in terms of their packings and pseudo-translational sublattices. Pseudo-translation lattices suggest face-centered cubic and hexagonal closed-packed sub-cells, where Rh atoms occupy nearly ideal lattices.
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Gellrich, Urs, and Thorsten Koslowski. "Rh chemistry through the eyes of theory." Wiley Interdisciplinary Reviews: Computational Molecular Science 6, no. 3 (February 25, 2016): 311–20. http://dx.doi.org/10.1002/wcms.1250.

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Patchett, Ruth, and Adrian B. Chaplin. "Coordination chemistry of a calix[4]arene-based NHC ligand: dinuclear complexes and comparison to IiPr2Me2." Dalton Transactions 45, no. 21 (2016): 8945–55. http://dx.doi.org/10.1039/c6dt01001f.

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The preparation and coordination chemistry of 5,17-bis(3-methyl-1-imidazol-2-ylidene)-25,26,27,28-tetrapropoxycalix[4]arene with rhodium(i) dimers [Rh(COD)Cl]2 and [Rh(CO)2Cl]2 has been explored.
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Gyton, Matthew R., Thomas M. Hood, and Adrian B. Chaplin. "A convenient method for the generation of {Rh(PNP)}+ and {Rh(PONOP)}+ fragments: reversible formation of vinylidene derivatives." Dalton Transactions 48, no. 9 (2019): 2877–80. http://dx.doi.org/10.1039/c8dt05049j.

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DICKSON, R. S. "ChemInform Abstract: Alkyne Rotation on a Rh-Rh Bond: An Entry to Diverse Chemistry." ChemInform 23, no. 6 (August 22, 2010): no. http://dx.doi.org/10.1002/chin.199206247.

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Ojima, Iwao, Robert J. Donovan, Patrizia Ingallina, N�ria Clos, William R. Shay, Masakatsu Eguchi, Qingping Zeng, and Anna Korda. "Organometallic chemistry and homogeneous catalysis of Rh and Rh-Co mixed metal carbonyl clusters." Journal of Cluster Science 3, no. 4 (December 1992): 423–38. http://dx.doi.org/10.1007/bf00702749.

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Atencio, Reinaldo, Gustavo Chacón, Lisbeth Mendoza, Teresa González, Julia Bruno-Colmenarez, Merlin Rosales, Briceño Alexander, and Edgar Ocando-Mavárez. "Chemistry of transition-metal complexes containing functionalized phosphines: synthesis and structural analysis of rhodium(I) complexes containing allyl and cyanoalkylphosphines." Acta Crystallographica Section C Structural Chemistry 76, no. 9 (August 30, 2020): 932–46. http://dx.doi.org/10.1107/s2053229620011420.

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A series of related acetylacetonate–carbonyl–rhodium compounds substituted by functionalized phosphines has been prepared in good to excellent yields by the reaction of [Rh(acac)(CO)2] (acac is acetylacetonate) with the corresponding allyl-, cyanomethyl- or cyanoethyl-substituted phosphines. All compounds were fully characterized by 31P, 1H, 13C NMR and IR spectroscopy. The X-ray structures of (acetylacetonato-κ2 O,O′)(tert-butylphosphanedicarbonitrile-κP)carbonylrhodium(I), [Rh(C5H7O2)(CO)(C8H13N2)] or [Rh(acac)(CO)(tBuP(CH2CN)2}] (2b), (acetylacetonato-κ2 O,O′)carbonyl[3-(diphenylphosphanyl)propanenitrile-κP]rhodium(I), [Rh(C5H7O2)(C15H14N)(CO)] or [Rh(acac)(CO){Ph2P(CH2CH2CN)}] (2h), and (acetylacetonato-κ2 O,O′)carbonyl[3-(di-tert-butylphosphanyl)propanenitrile-κP]rhodium(I), [Rh(C5H7O2)(C11H22N)(CO)] or [Rh(acac)(CO){tBu2P(CH2CH2CN)}] (2i), showed a square-planar geometry around the Rh atom with a significant trans influence over the acetylacetonate moiety, evidenced by long Rh—O bond lengths as expected for poor π-acceptor phosphines. The Rh—P distances displayed an inverse linear dependence with the coupling constants J P-Rh and the IR ν(C[triple-bond]O) bands, which accounts for the Rh—P electronic bonding feature (poor π-acceptors) of these complexes. A combined study from density functional theory (DFT) calculations and an evaluation of the intramolecular H...Rh contacts from X-ray diffraction data allowed a comparison of the conformational preferences of these complexes in the solid state versus the isolated compounds in the gas phase. For 2b, 2h and 2i, an energy-framework study evidenced that the crystal structures are mainly governed by dispersive energy. In fact, strong pairwise molecular dispersive interactions are responsible for the columnar arrangement observed in these complexes. A Hirshfeld surface analysis employing three-dimensional molecular surface contours and two-dimensional fingerprint plots indicated that the structures are stabilized by H...H, C...H, H...O, H...N and H...Rh intermolecular interactions.
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Pandey, Krishna K. "Coordination chemistry of NSO−, NSO2− and S3N− ligands: comparison of electronic structure of RhNSO, RhSH and RhCl complexes." Inorganica Chimica Acta 182, no. 2 (April 1991): 163–71. http://dx.doi.org/10.1016/s0020-1693(00)90151-8.

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Loreto, Domenico, Giarita Ferraro, and Antonello Merlino. "Unusual Structural Features in the Adduct of Dirhodium Tetraacetate with Lysozyme." International Journal of Molecular Sciences 22, no. 3 (February 2, 2021): 1496. http://dx.doi.org/10.3390/ijms22031496.

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The structures of the adducts formed upon reaction of the cytotoxic paddlewheel dirhodium complex [Rh2(μ-O2CCH3)4] with the model protein hen egg white lysozyme (HEWL) under different experimental conditions are reported. Results indicate that [Rh2(μ-O2CCH3)4] extensively reacts with HEWL:it in part breaks down, at variance with what happens in reactions with other proteins. A Rh center coordinates the side chains of Arg14 and His15. Dimeric Rh–Rh units with Rh–Rh distances between 2.3 and 2.5 Å are bound to the side chains of Asp18, Asp101, Asn93, and Lys96, while a dirhodium unit with a Rh–Rh distance of 3.2–3.4 Å binds the C-terminal carboxylate and the side chain of Lys13 at the interface between two symmetry-related molecules. An additional monometallic fragment binds the side chain of Lys33. These data, which are supported by replicated structural determinations, shed light on the reactivity of dirhodium tetracarboxylates with proteins, providing useful information for the design of new Rh-containing biomaterials with an array of potential applications in the field of catalysis or of medicinal chemistry and valuable insight into the mechanism of action of these potential anticancer agents.
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Dissertations / Theses on the topic "Rh(I) chemistry]"

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King, A. P. "Structural and reactive studies of Rh(110) and Rh(111) surfaces." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377227.

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Wang, Yaquan. "New routes to Rh (and CeO←2-promoted) Rh/SiO←2 catalysts for alcohol synthesis." Thesis, Brunel University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359923.

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Emslie, David James Hannington. "The redox chemistry of Rh(I) pyrzolylborate and related complexes." Thesis, University of Bristol, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302160.

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Alshehri, Feras. "The hydrogenation of substituted benzenes over Rh/silica." Thesis, University of Glasgow, 2017. http://theses.gla.ac.uk/8342/.

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The catalytic hydrogenation of substituted benzenes to saturated cyclic products is an industrially relevant reaction. It is important in the production of fine chemicals, petroleum and in the fuel industry. It is used in the process of lowering the aromatic content in diesel fuels to follow up the up-to-date environmental legalisation. It has been widely reported that aromatic ring hydrogenation is a structure insensitive reaction, however more recent studies have suggested that structure sensitivity may indeed exist. Therefore, the demand to perform more research on substituted benzenes to understand their behaviour during the hydrogenation has increased. Unlike most of what was found in literature, this study involved substituents which include methyl, ethyl, propyl, hydroxyl and methoxy groups. These reactions were performed at different parameters of temperatures, H2 pressure and concentrations and over Rh/SiO2 catalyst. Different mechanisms were suggested for the hydrogenation of aromatic compounds. A stepwise mechanism is generally accepted to explain the reaction mechanism. This suggestion was built on the fact aromatic adsorption is zero order in aromatics which suggests a strong adsorption of the substrates. This mechanism was confirmed in this work by the observation of alkyl cyclohexenes as intermediates during the hydrogenation of alkyl benzenes. Interesting points were observed during the hydrogenation of phenols. Firstly, cyclohexane was formed independently and directly from the original phenol. This observation was not found in most of previous studies. The other point was that phenol and anisole reacted in different ways from each other. Phenol was found to react in three independent routes, the formation of cyclohexanone, the formation of cyclohexanol and the formation of cyclohexane. Whereas, cyclohexanol was not formed directly from anisole, it was formed from cyclohexanone and after the total conversion of anisole. Competitive hydrogenations were also executed in order to investigate the behaviour of different groups in the same reaction. The findings of these tests were different from what was observed during the solo tests. As for the hydrogenation of alkylbenzenes, a steric effect might explain the differences between these substrates. It was observed that the reaction rate decreased as the alkyl group attached to the ring increased. These findings were not the same during the competitive hydrogenation. n-Propylbenzene, which has a larger group attached to the aromatic ring, showed higher reactivity in the presence of toluene and ethylbenzene, which suggests that the steric effect was not the only factor affecting the hydrogenation of substituted benzenes. These findings were explained by an electronic effect applied by the alkyl groups attached to the ring. The effect of these groups increases as the group size increases. In addition to steric and electronic effects, the mode of adsorption was also suggested to affect the competitive hydrogenations of phenols. Different modes of adsorption and different medium species formed leads to different behaviour during the competitive hydrogenation. In addition, NMR analysis was performed on selected samples from toluene and deuterated toluene reactions with deuterium and hydrogen. Toluene reaction with deuterium showed that all hydrogen atoms were replaced by deuterium at the beginning of the reaction. It was also shown from NMR results that -CD3 group was contacted to the surface which confirms the ability of -CH3 group to be adsorbed to the surface as well as the aromatic ring.
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Smith, Joshua J. "Stereoselective Rh- and Cu-catalysed additions to imines and aldehydes." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/39370/.

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Chapter 1.Copper-Catalysed Borylative Coupling of Vinylazaarenes and N-Boc Imines. Methodology for the copper-catalysed three-component couplings of vinylazaarenes, bis(pinacolato)diboron, and N-Boc imines has been developed. Oxidation of the initially formed boron species gives azaarene-containing, Boc-protected amino alcohols with reasonable to good diastereoselectivities. Additionally the synthetic utility of the reaction products have been demonstrated. The crude boron species have been shown to undergo a Suzuki-Miyaura cross coupling to give further functionalised products. Finally, facile deprotection of the reaction products is possible. Chapter 2. Chain Walking of Allylrhodium Species in Rhodium-Catalysed Nucleophilic Allylations of Imines and Aldehydes. Allylrhodium species derived from δ-trifluoroboryl β,γ-unsaturated esters undergo chain walking towards the ester moiety. The resulting allylrhodium species react with imines to give products containing two new stereocenters and a Z-alkene. By using a chiral diene ligand, products can be obtained with high enantioselectivities. A pronounced matched/mismatched effect with the chirality of the allyltrifluoroborate is also observed. In an analogous reaction a rhodium-hydride species has been shown to catalyse the addition of diene esters and aldehydes via allylrhodium intermediates which also undergo chain walking towards the ester moiety. The methodology enables allylation of aromatic aldehydes with compounds containing both diene and ester functionalities linked by carbon chains of up to eight carbons in length.
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Korkis, Stamatis E. "New reactive sites enabled via an allyl-to-allyl 1,4-Rh(III) migration." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/48787/.

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The Rh(III)-catalysed oxidative C–H allylation and homoallylation of N-acetylbenzamides with 1,3-dienes is described. The presence of allylic hydrogens cis to the less substituted alkene of the 1,3-diene is important for the success of these reactions, though not essential. With the assistance of reactions using deuterated 1,3-dienes, a proposed mechanism is provided. The key step is postulated to be the first reported examples of allyl-to-allyl 1,4-Rh(III) migration. Importantly, migration to primary or secondary allylic position results in allylation products, whereas migration to a tertiary position leads to homoallylation. Using 1,4-dienes as the coupling partner, N-tosylbenzamides are homoallylated. Preliminary results indicate a mixture of isomer products, with major isomer resulting from an allyl-to-allyl 1,4-Rh(III) migration.
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Telep, David A. "Investigation into optimal Rh(III) dopant placement in silver bromide emulsions /." Online version of thesis, 1993. http://hdl.handle.net/1850/11745.

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Thammajak, Nirawat. "Synthesis and characterisation of metal oxides isostructural with La₁₈Li₈Rh₅O₃₉." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:5a97db26-edb3-45e0-972d-e516da0384d3.

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The structural chemistry and magnetic properties of compounds isostructural with La18Li8Rh5O39 have been studied. In this cubic structure (space group Pm_3n), [111] chains of alternating RhO6 octahedra (2a, 8e sites) and LiO6 trigonal prisms (16i site) occupy channels within a La-O framework. In order to study the consequences of both reducing the dimensions of the channels and introducing paramagnetic cations into both the framework and the polyhedral chains, compositions in the series Nd18Li8Rh5-xFexO39 (1 ≤ x ≤ 4) have been synthesised and characterised by magnetometry, neutron diffraction and Mössbauer spectroscopy. Iron preferentially occupies the 2a site as low-spin Fe(IV) and the larger 8e site as high-spin Fe(III). Compositions having x > 1 show spin-glass-like behaviour below ~5 K. The behaviour of this series of compositions has been compared with that of the known series La18Li8Rh5-xFexO39. In order to facilitate this comparison, the structure of La18Li8Fe5O39 has been fully characterised by both neutron diffraction and EXAFS. The use of both techniques has revealed differences between the mean and local environments of iron. In order to explore and extend the range and combinations of elements that can be accommodated in this structure, the Ti-containing compounds Ln18Li8M4TiO39 (Ln=La,Nd,Pr,Sm; M=Rh,Fe,Co) have been synthesised. Nd18Li8Fe4TiO39 was selected for a detailed study by magnetometry, neutron diffraction, Mössbauer spectroscopy and XANES. Cations were found to be stabilised in unusual oxidation states and disordered over three sites of the Nd18Li8Fe4TiO39 polyhedral chains. The 8e site is occupied by high-spin Fe3+, Ti3+ and Li+ in a ratio of 76:20:4; the 2a site by low-spin Fe4+ and Ti4+ in a ratio of 79:21 and the trigonal-prismatic 16i site by Li+ and Fe3+ in a ratio of 98:2. Nd18Li8Fe4TiO39 undergoes a transition to a spin-glass state at 4.25(5) K, whereas La18Li8Fe4TiO39 revealed a different type of magnetic transition at ~8 K. The nature of this transition is not yet clear. Monophasic samples could not be prepared in the Nd/Rh system and cation vacancies were found in Nd/Co. No pure samples of Sm-containing compositions could be prepared, while the only Pr composition which was obtained pure, according to X-ray diffraction, Pr18Li8Co4TiO 39 shows the similar magnetic properties to Pr18Li8Co3TiO39. The compositions Ln18Li8M3 M'O39 (Ln=La,Nd,Pr,Sm; M,M'=Fe,Co,Ti) with 25% of the 8e sites vacant have been investigated. The Co-containing compositions Nd18Li8Co3FeO39-y, Nd18Li8CoFe3O39-y and Nd18Li8Co3TiO39-y were characterised by neutron diffraction. Cation vacancies on the 8e sites were found to coexist with anion vacancies around the 2a sites. The remaining octahedral sites are occupied by a disordered arrangement of transition-metal cations. The trigonal-prismatic sites are fully occupied by Li except in the case of Nd18Li8CoFe3O39-y where some Fe is present, as confirmed by Mössbauer spectral data. Antiferromagnetic interactions are present on the Nd sublattice in each composition, but a spin glass forms below 5 K when a high concentration of spins is also present on the octahedral sites. The magnetic character of the Ln cations plays an important role in determining the properties of these compounds. Long-range magnetic order of the transition-metal cations was not observed in any compositions. Although this might be partly attributable to the cation disorder in the polyhedral chains, the apparent antiferromagnetic behaviour of Nd-containing compositions in which the transition metals have a low magnetic moment, e.g. Nd18Li8Co3TiO39-y, and the marked contrast between certain La and Nd compositions in which the transition metal content is the same, e.g. Nd18Li8Fe4TiO39 and La18Li8Fe4TiO39, suggests that the Ln sublattice is fully involved in determining the magnetic behaviour.
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Schreiber, Tara N. "SYNTHESIS AND COMPLEXATION OF RHODIUM TRICHLORIDE BY 1-AZA-4,7-DITHIACYCLONONANE AND DERIVATIVES." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1153756558.

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Medvetz, Douglas Allen. "The Synthesis, Characterization, and Antitumor Properties of Ag(I), Cu(II), and Rh(III) Metal Complexes." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1216840371.

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Books on the topic "Rh(I) chemistry]"

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Swars, Kurt, and G. R. Watts. Rh Rhodium: Coordination Compounds with o- and N-Containing Ligands. Springer, 2013.

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Swars, Kurt, and G. R. Watts. Gmelin Handbook of Inorganic and Organometallic Chemistry - 8th Edition Element R-H Rh. Rhodium (System-NR. 64) Supplement R-H Gmelin Rh.Rhodium Suppl. Springer, 1991.

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Book chapters on the topic "Rh(I) chemistry]"

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Hocart, S. J., M. V. Nekola, and D. H. Coy. "Present status of LH-RH analog chemistry." In LH-RH and its Analogues, edited by Manfred Schmidt-Gollwitzer and Rosemarie Schley, 43–50. Berlin, Boston: De Gruyter, 1985. http://dx.doi.org/10.1515/9783110861488-007.

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Kölle, Ulrich, and Holger Fränzl. "Oxidation of Alcohols by [Cp*Rh(ppy)(OH)]+." In Organometallic Chemistry and Catalysis, 97–102. Vienna: Springer Vienna, 2001. http://dx.doi.org/10.1007/978-3-7091-6274-3_9.

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De Bruin, Bas, Dennis G. H. Hetterscheid, Arjan J. J. Koekkoek, and Hansjörg Grützmacher. "The Organometallic Chemistry of Rh-, Ir-, Pd-, and Pt-Based Radicals: Higher Valent Species." In Progress in Inorganic Chemistry, 247–354. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470144428.ch5.

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Cao, Zexing. "Reactivity of Metal Carbene Clusters Pt n CH 2 + and PtMCH 2 + (M = Cu, Ag, Au, Pt, Rh) Toward O2 and NH3: A Computational Study." In Computational Organometallic Chemistry, 169–218. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25258-7_7.

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Gladiali, Serafino, Serenella Medici, Tamàs Kégl, and Làszlò Kollàr. "Synthesis, Characterization, and Catalytic Activity of Rh(I) Complexes with (S)-BINAPO, an Axially Chiral Inducer Capable of Hemilabile P,O-Heterobidentate Coordination." In Organometallic Chemistry and Catalysis, 127–37. Vienna: Springer Vienna, 2001. http://dx.doi.org/10.1007/978-3-7091-6274-3_13.

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Knoll, Jessica D., and Karen J. Brewer. "A New Paradigm for Photodynamic Therapy Drug Design: Multifunctional, Supramolecular DNA Photomodification Agents Featuring Ru(II)/Os(II) Light Absorbers Coupled to Pt(II) or Rh(III) Bioactive Sites." In Progress in Inorganic Chemistry: Volume 59, 189–244. Hoboken, New Jersey: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118869994.ch02.

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Solymosi, F. "Activation and Reactions of CO2 on Rh Catalysts." In Carbon Dioxide Chemistry, 44–54. Elsevier, 1994. http://dx.doi.org/10.1016/b978-1-85573-799-0.50010-8.

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Wang, Minghao, Alexander Lu, and Vy M. Dong. "Hydroformylation: Alternatives to Rh and Syn-gas." In Reference Module in Chemistry, Molecular Sciences and Chemical Engineering. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-820206-7.00093-7.

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Ghomari, R., A. Bouferguene, P. E. Hoggan, and S. M. Mekelleche. "A Density Functional Theory Study of the Adsorption of 2-Cyclohexenone on Rh(111)." In Advances in Quantum Chemistry, 175–90. Elsevier, 2014. http://dx.doi.org/10.1016/b978-0-12-800536-1.00009-5.

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Ji, G. L. "Electrostatic Adsorption of Anions." In Chemistry of Variable Charge Soils. Oxford University Press, 1997. http://dx.doi.org/10.1093/oso/9780195097450.003.0007.

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Electrostatic adsorption of anions is one of the important characteristics of variable charge soils. This is caused by the fundamental feature that these soils carry a large quantity of positive surface charge. However, because these soils carry positive as well as negative surface charges, they may exert both attractive and repulsive forces on anions. Therefore, the situation in the adsorption of anions by these soils may be quite complex. There may also be the occurrence of negative adsorption of anions. Besides, for some anion species both electrostatic force and specific force may be involved during their interactions with variable charge soils. As shall be seen in this chapter, such specific force may be operative even for some anion species such as chloride that are generally considered as solely electrostatic in nature during adsorption. Because of historical reasons, the literature on electrostatic adsorption of anions by soils is very limited. Nevertheless, as shall be seen in this chapter, the topic is of interest in both theory and practice. In the present chapter, adsorption of anions shall be discussed mainly from the viewpoint of electrostatic adsorption. The other type of adsorption, specific adsorption or coordination adsorption, shall be dealt with in Chapter 6. The radius of anions is generally much larger than that of cations. Thus, the charge density on anions would be low. When hydrated, because of the smaller ion-dipole force exerted on water molecules, anions are less hydrated than cations. This can be seen in Table 4.1. The rH/rc ratio for cations ranges from 2.22 to 6.37, while that for anions is smaller than 2 except for F-. The orientation of water molecules around anions, especially in the primary hydration region, is also different from that around cations (Conway, 1981). Because of the small rH/rc ratio, hydration does not induce the change in order of size when anions of the same valency are compared. For example, the crystal radii of Cl-, NO3-, and ClO4- are 0.181, 0.264, and 0.292 nm, respectively, while the hydrated radii of these ions are 0.332, 0.335, and 0.338, respectively.
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Conference papers on the topic "Rh(I) chemistry]"

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Garg, D., B. Ghosh, D. Kumar, P. Sahoo, H. Shah, P. Tripathi, and N. Viswanathan. "Evolution of Steel Chemistry and Cleanliness During RH Degassing Process." In AISTech 2022 Proceedings of the Iron and Steel Technology Conference. AIST, 2022. http://dx.doi.org/10.33313/386/202.

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Stefanescu, Ana-Maria, Cristina Dumitrescu, and Adriana Padure. "Plasma Neurotransmitters Variation in Growth Hormone Deficient Children under rh-GH Replacement Therapy. Preliminary Data." In 2nd International Electronic Conference on Medicinal Chemistry. Basel, Switzerland: MDPI, 2016. http://dx.doi.org/10.3390/ecmc-2-a015.

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JIA, MENGQIU, N. I. KUDRYASHOV, and A. MERETSKY. "THE METHOD OF DETERMINATION OF THE SURFACE COMPOSITION OF THE Ir-Rh ALLOYS." In Proceedings of the International Symposium on Solid State Chemistry in China. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812776846_0071.

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Stefanescu, Ana-Maria, Dana Manda, Adriana Padure, and Cristina Dumitrescu. "Interrelation between Histamine and Serotonin, Dopamine, GABA, IGF-1 in a Growth Hormone (GH) Deficient Group under rh-GH Replacement Therapy." In 3rd International Electronic Conference on Medicinal Chemistry. Basel, Switzerland: MDPI, 2017. http://dx.doi.org/10.3390/ecmc-3-04639.

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Raoufi, Arman, Sagar Kapadia, and James C. Newman. "Sensitivity Analysis and Computational Optimization of Fuel Reformer." In ASME 2016 14th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2016 Power Conference and the ASME 2016 10th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fuelcell2016-59110.

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In this study, the catalytic combustion of methane is numerically investigated using an unstructured, implicit, fully coupled finite volume approach. Nonlinear system of equations is solved by Newton’s method. The catalytic partial oxidation of methane over both platinum and rhodium catalysts are studied three-dimensionally. Eight gas-phase species (CH4, CO2, H2O, N2, O2, CO, OH and H2) are considered for the simulation. Surface chemistry is modeled by detailed reaction mechanisms including 24 heterogeneous reactions with 11 surface-adsorbed species for Pt catalyst and 38 heterogeneous reactions with 20 surface-adsorbed species for Rh catalyst. The numerical results are compared with the experimental data and good agreement is observed. The performance of the fuel reformer is analyzed for two different catalysts. The sensitivity analysis for the reactor is performed using three different approaches: finite difference, direct differentiation and adjoint method. The design cycle is performed using two gradient-based optimization algorithms to improve the value of the implemented cost function and optimize the reactor performance.
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6

Shaafaey, Mamoon, Amir Bahrololoumi, and Roozbeh Dargazany. "Experimental Characterization of Polyurethane Adhesive: Independence of Environmental and Mechanical Aging." In ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-95230.

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Abstract Assessment of the durability of elastomers for structural applications has been of much interest among the literary circles for quite some time. All polymeric materials undergo degradation when in contact with aggressive environmental agents like humidity, water, and temperature. This rate of degradation should increase with the growing intensity of the ambient environmental agents involved. On the other hand, during service life, these materials are also subjected to mechanical loading in one way or the other. The rate and extent of degradation can be accessed by scrutinizing the changes in constitutive behavior of material through mechanical and chemical properties. Accelerated thermal, hydrolytic, and hygrothermal aging are among the most common modes of process-related degradation, leading generally to chain scission, cross-linking phenomena, and reduced resistance to fracture stress and strain. In this experimental study, our goal is to separate the environmental degradation from mechanical damage. A polyurethane based (PUB) adhesive was aged in thermo-oxidative (0%RH), hydrolytic aging, and hygrothermal (80%RH) aging environments. The damage and decay mechanisms have been used to draw a distinction between environmental degradation and mechanical damage. Material characterization included cyclic tensile tests, gravimetric measurements to observe water-uptake, FTIR and scanning electron microscopy (SEM) tests on as-received and aged samples. Aging was conducted at three different temperatures (60°C, 80°C and 95°C) and four different exposure durations (1, 10, 30, and 90 days). This work confirms that environmental degradation is separable from mechanical damage. Data collected during gravimetric measurements indicate that during aging in desalinated water, water uptake increases linearly with the square root of the aging duration, which agrees with Fick’s second law. Increasing water uptake is proportional to decreasing tensile strength and toughness of the material. The total mechanical and environmental damage is a synergized effect of all exposure conditions and parameters involved i.e. aging time, temperature, oxygen, water, and humidity. The chemistry and mechanics of the polymer degradation were found to be in good agreement with each other.
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Sausa, Rosario C., Stephen L. Howard, and Andrzej W. Miziolek. "Mass spectrometric and laser-based studies of H2/N2O and H2/NO2 low pressure flames." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.tuoo4.

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A major new research facility consisting of a low-pressure burner apparatus has been constructed at the Ballistic Research Laboratory to study the detailed flame chemistry relevant to the gaseous flames of burning propellants. Experimental results provide temperature and species profiles that are necessary to validate flame models being developed to simulate propellant combustion. This facility is an integrated apparatus that consists of various diagnostic tools which include laser spectroscopy, Fourier transform infrared spectroscopy, and molecular beam triple quadrupole mass spectrometry. In this paper, we report on spatially resolved temperature and species profiles obtained in premixed H2/N2O/Ar and H2/NO2/Ar low-pressure flames (20 Torr). The temperature measurements were obtained by laser-induced fluorescence (LIF) of OH radical employing its (A2Σ+–X2Π) (1,0) band near 281 nm. Temperatures were abstracted from a Boltzmann energy simulation and compared with those obtained with Pt/Pt-Rh(10%) thermocouples coated with noncatalytic beryllium/yttrium oxide. Species profiles include H, H2, O, OH, N2O, NO, NO2, O2, H2O and NO2. Profiles for radical species such as OH and NO are compared with those obtained with LIF and/or resonant-enhanced multiphoton ionization to ensure that there are no systematic errors in a given technique.
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8

Alazhary, Sharif, Hamid Mohammadi, Mamoon Shaafaey, and Roozbeh Dargazany. "Independence of Environmental and Mechanical Damages on Silicone Adhesive Stored in a Thermo-Oxidative Environment." In ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-96008.

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Abstract Elastomeric polymer materials hold a special place in today’s industrial sectors with respect to structural application needs. Low quality materials are detrimental to industries like aerospace, and automotive engineering. Assessment of the durability of elastomers for structural applications has been of much interest among the literary circles for decades and new materials keep outperforming the existing ones. Polymeric adhesives are one of the most abundantly used materials in these industries. All polymeric materials get damaged when in contact with aggressive environments in presence of high temperature and oxygen. Commonly referred to as thermo-oxidation, this environment exposes the material to heat and oxidation reactions in presence of oxygen. Resultantly, during service life, the damage to the polymer matrix is primarily caused by two factors: mechanical damage and environmental aging. Environmental aging is an irreversible phenomenon caused by changes in the molecular structure while mechanical damage maintains the shape of the polymer matrix, and the deterioration is mostly due to polymer chain mobility. Environmental aging can be caused by a single environmental agent or by a synergized impact of several environmental elements. Increasing temperature is found to be proportional to decreasing tensile strength and toughness of material. The rate and extent of degradation can be accessed by scrutinizing the changes in constitutive behavior of material through mechanical and chemical properties. Accelerated thermal aging is among the most common modes of process related degradation, leading generally to chain scission, and crosslinking phenomena and reduced resistance to fracture stress, and strain. In this experimental study, our goal is to separate the environmental degradation from mechanical damage. A silicone-based adhesive was aged in thermo-oxidative at (0%RH) aging environment. The damage and decay mechanisms have been used to draw a distinction between environmental degradation and mechanical damage. Material characterization included uniaxial tensile test (failure and cyclic) and scanning electron microscopy (SEM) tests on as-received and aged samples. Aging was conducted at three different temperatures (60°C, 80°C and 95°C) and six different exposure durations (1, 3, 10, 30, 90 and 200 days). This work confirms that environmental damage is superposed on top of the mechanical damage, and thus, they are separable. The total mechanical and environmental damage is a synergized effect of all exposure conditions and parameters involved i.e., aging time, temperature, and oxygen. The chemistry and mechanics of the polymer degradation were found to be in good agreement with each other.
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Reports on the topic "Rh(I) chemistry]"

1

Kao, C. T. The structure, ordering, and chemistry of molecular overlayers on Rh(111) and Rh(100) single crystal surfaces: A vibrational spectroscopic and LEED crystallographic study. Office of Scientific and Technical Information (OSTI), October 1988. http://dx.doi.org/10.2172/6185255.

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