Relevant bibliographies by topics / Metal carbene complexes

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  4. Book chapters
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Academic literature on the topic 'Metal carbene complexes'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Metal carbene complexes"

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Öfele, K., E. Tosh, C. Taubmann, and W. A. Herrmann. "Carbocyclic Carbene Metal Complexes." Chemical Reviews 109, no. 8 (August 12, 2009): 3408–44. http://dx.doi.org/10.1021/cr800516g.

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OEFELE, K., and F. R. KREISSL. "ChemInform Abstract: Transition Metal Carbene and Carbyne Complexes." ChemInform 26, no. 6 (August 18, 2010): no. http://dx.doi.org/10.1002/chin.199506264.

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Fischer, Ernst Otto, Christos Apostolidis, Ernst Dornberger, Alexander C. Filippou, Basil Kanellakopulos, Bernhard Lungwitz, Jakob Müller, Bernhard Powietzka, Jean Rebizant, and Werner Roth. "Carben- und Carbin-Komplexe des Technetiums und Rheniums - Synthese, Struktur und Reaktionen / Carbene and Carbyne Complexes of Technetium and Rhenium - Synthesis, Structure and Reactions." Zeitschrift für Naturforschung B 50, no. 9 (September 1, 1995): 1382–95. http://dx.doi.org/10.1515/znb-1995-0916.

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AbstractSynthesis, structure and reactions of technetium and rhenium complexes bearing metal-carbon multiple bonds are reported. Addition of LiPh to Cp*M (CO)3 (1a : M = Tc; 1b: M = Re) (Cp* = η5-C5Me5) in Et2O yields the acyl complexes Li[Cp*(CO)2MC(O)Ph]·Et2O (2a: M = Tc; 2 b: M = Re). These are converted with Et3OBF4 into the carbene complexes Cp*(CO)2M = C(OEt)Ph (3a, 3b). Reaction of 3a and 3 b with BCl3 affords the carbyne complexes [Cp*(CO)2M ≡ CPh]BCl4 (4a, 4b) in high yield. The acyl complex 2b can be directly converted into the carbyne complex [Cp*(CO)2Re ≡ CPh]Br (5b), when it is treated with oxalyl bromide. Nucleophiles add at the carbynecarbon atoms of 4a and 4b, as demonstrated by the reaction with NaOCy (Cy = cyclohexyl) to afford the carbene complexes Cp*(CO)2M = C(OCy)Ph (6a, 6b). Similarly, reaction of P(OMe)3 with [Cp*(CO)2Re ≡ CPh]Cl (5b'), the latter being generated in situ from 2b and oxalyl chloride, gives the ylide complex {Cp*(CO)2Re = C[P(OMe)3]Ph}Cl (7b'). In comparison, addition of P(OMe)3 to [Cp*(CO)2Tc ≡ CPh]Cl (5a'), generated in situ from 2a and oxalyl chloride, induces a carbvne-carbonvl coupling reaction resulting in the formation of the ketenyl complex . Thermolysis of the compounds 2a, 2b, 4a, 4b and 7b' has been studied in vacuo and the products of decomposition identified by IR spectroscopy. The solid-state structure of the carbene complexes 3 a and 3 b was determined by single crystal X-ray diffraction studies. Both compounds crystallize in the monoclinic space group P21/n with very similar unit cell data. Striking feature of the isostructural carbene complexes is the nearly perpendicular orientation of the carbene ligand relative to the Cp* ring.
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Michalak and Kośnik. "Chiral N-heterocyclic Carbene Gold Complexes: Synthesis and Applications in Catalysis." Catalysts 9, no. 11 (October 25, 2019): 890. http://dx.doi.org/10.3390/catal9110890.

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N-Heterocyclic carbenes have found many applications in modern metal catalysis, due to the formation of stable metal complexes, and organocatalysis. Among a myriad of N-heterocyclic carbene metal complexes, gold complexes have gained a lot of attention due to their unique propensity for the activation of carbon-carbon multiple bonds, allowing many useful transformations of alkynes, allenes, and alkenes, inaccessible by other metal complexes. The present review summarizes synthetic efforts towards the preparation of chiral N-heterocyclic gold(I) complexes exhibiting C2 and C1 symmetry, as well as their applications in enantioselective catalysis. Finally, the emerging area of rare gold(III) complexes and their preliminary usage in asymmetric catalysis is also presented.
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Lin, Joseph C. Y., Roy T. W. Huang, Chen S. Lee, Amitabha Bhattacharyya, Wen S. Hwang, and Ivan J. B. Lin. "Coinage Metal−N-Heterocyclic Carbene Complexes." Chemical Reviews 109, no. 8 (August 12, 2009): 3561–98. http://dx.doi.org/10.1021/cr8005153.

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Longevial, Jean-François, Mamadou Lo, Aurélien Lebrun, Danielle Laurencin, Sébastien Clément, and Sébastien Richeter. "Molecular complexes and main-chain organometallic polymers based on Janus bis(carbenes) fused to metalloporphyrins." Dalton Transactions 49, no. 21 (2020): 7005–14. http://dx.doi.org/10.1039/d0dt00594k.

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Janus bis(N-heterocyclic carbenes) composed of a porphyrin core with two N-heterocyclic carbene (NHC) heads fused to opposite pyrroles were used as bridging ligands for the preparation of metal complexes.
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Peters, Marius, Adinarayana Doddi, Thomas Bannenberg, Matthias Freytag, Peter G. Jones, and Matthias Tamm. "N-Heterocyclic Carbene-Phosphinidene and Carbene-Phosphinidenide Transition Metal Complexes." Inorganic Chemistry 56, no. 17 (August 22, 2017): 10785–93. http://dx.doi.org/10.1021/acs.inorgchem.7b01798.

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Mungur, Shaheed A., Stephen T. Liddle, Claire Wilson, Mark J. Sarsfield, and Polly L. Arnold. "Bent metal carbene geometries in amido N-heterocyclic carbene complexes." Chemical Communications, no. 23 (2004): 2738. http://dx.doi.org/10.1039/b410074c.

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Office, Editorial. "The steric and electronic effects of metal-containing substituents on Fischer carbene metal clusters." Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 28, no. 3 (September 6, 2009): 237–60. http://dx.doi.org/10.4102/satnt.v28i3.61.

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Yang, Liangru, Qi Guo, Yongmei Xiao, and Pu Mao. "Development of ChelatingN-Heterocyclic Carbene Metal Complexes." Chinese Journal of Organic Chemistry 35, no. 9 (2015): 1834. http://dx.doi.org/10.6023/cjoc201503040.

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Dissertations / Theses on the topic "Metal carbene complexes"

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Casely, Ian J. "Electropositive metal N-heterocyclic carbene complexes." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/3873.

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The first chapter is an introduction to the f-elements, with a focus on the synthesis and chemistry of tetravalent cerium complexes. The synthesis, characterisation and reactivity of carbenes, particularly N-heterocyclic carbenes (NHCs), and anionic-functionalised NHC ligands is discussed. The synthesis and reactivity of s-block, Group three and fblock NHC complexes is reviewed. The synthesis of the alcohol-functionalised unsaturated imidazolium proligand, [H2L]I [H2L = HOCMe2CH2(1-CH{NCHCHNiPr})], is extended to saturated imidazolinium analogues, [H2LR]X, [HOCMe2CH2(1-CH{NCH2CH2NR})]X (R = iPr, abbreviated to P; R = Mes, abbreviated to M; R = Dipp, abbreviated to D, X = Cl, I). Mono-deprotonation results in the isolation of bicyclic imidazolidines HLR, which can be ring-opened and silylated by treatment with Me3SiI, to afford [HLR, OSiMe3]I, R = iPr and Mes. Further deprotonation of HLR with MN"2 (M = Mg, Zn; N" = N(SiMe3)2) affords LRMN" (M = Mg and Zn) and ZnLR 2. These complexes proved active for the polymerisation of raclactide at room temperature without the need for an initiator. The third chapter focuses on cerium chemistry. Repetition of the literature synthesis of CeIV tert-butoxide compounds affords the unsolvated Ce(OtBu)4 and also the cluster Ce3(OtBu)11. Treatment of Ce(OtBu)4 with HL did not yield a CeIV-NHC complex, but one bearing a tethered imidazolium group, (OtBu)3Ce( -OtBu)2( -HL)Ce(OtBu)3. The synthesis of a CeIII-NHC complex, CeL3, and the oxidation of this forms an unprecedented CeIV-NHC complex, CeL4, via ligand redistribution; the complex contains two bidentate ligands and two alkoxide-tethered free NHC groups. Functionalisation of the free NHCs with boranes affords the adducts Ce(L)2(L-B)2, where B = BH3 or 9-BBN (9-Borabicyclo[3.3.1]nonane). A number of cerium complexes of the saturated-backbone NHC, LR, LRCeN"2 and LR 2CeN", have been synthesised and their oxidation chemistry and reactivity investigated. The final chapter contains an NMR study of the synthesis of a series of yttrium LR adducts, LP xYN"(3-x) (x = 1, 2 or 3), and of the synthesis of uranium complexes LRUN"2, R = Mes or Dipp, including a range of small molecule reaction chemistry. The uranyl NHC complexes, UO2LR 2, R = Mes or Dipp, have also been synthesised and characterised; these possess very high frequency carbene carbon chemical shifts.
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Niven, Stuart. "Chelating carbene ligands and their metal complexes." Thesis, Cardiff University, 2007. http://orca.cf.ac.uk/54628/.

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This thesis describes the synthesis of a number of functionalised imidazolium salts as precursors to N- heterocyclic carbenes and their subsequent coordination to Ag and Pd. Further a number of the Pd complexes were tested in the Heck reaction and their activities compared to complexes with similar structural features currently within the literature. A range of imidazolium salts have been synthesised which include quinoline and octahydroacridine moieties and have been characterised by a number of methods including X-ray crystallography. A bis imidazolium salt has also been prepared as a DIOP analogue. The imidazolium salts were successfully reacted with Ag20 to form the NHCAg(I) complexes. The quinoline and octahydroacridine based NHCs were transmetallated to Pd as chelating ligands, the quinoline based systems appearing as planar, strained complexes in the X-ray structure. The activities of the quinoline and octahydroacridine based NHCPd(II) complexes in the Heck coupling of 4-bromoacetophenone and 4-chlorobenzaldehyde with n-butyl acrylate were assessed and found to be comparable to similar systems with low to satisfactory conversions.
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Serre, Veronique. "Synthesis of new N-heterocyclic carbene metal complexes." Thesis, Loughborough University, 2004. https://dspace.lboro.ac.uk/2134/34833.

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This thesis describes the synthesis of new N-heterocyclic carbene complexes through the synthesis of 1,4-bis-substituted imidazolium salts or tricyclic saturated imidazolium salts. The introduction highlights some of the most successful methods for preparing N-heterocyclic carbenes and corresponding metal complexes. Examples of the use of these complexes in transition metal-catalysed processes are provided towards the end of this chapter. The second chapter is dedicated to our efforts to synthesize 1,4-bis-substituted imidazolium salts as precursors for the synthesis of N-heterocyclic carbene complexes. The first part of this chapter describes the synthesis of 1,4-bis-substituted imidazolium salts using 1,4-bis-substituted diazabutadienes. Following this, attempts to deprotonate imidazolium salts to afford the desired N-heterocyclic carbenes are discussed. On the basis of the results obtained for the synthesis of 1,4-bis-substituted imidazol-2-ylidenes, the synthesis of N-heterocyclic carbene complexes, where the carbene is generated in situ are explored at the end of this chapter. The synthesis of enantiomerically pure tricyclic saturated imidazolium salts via enantiomerically pure diamines is discussed in the third chapter. Firstly, different methods were tested for the preparation of diamines from 6,6'-dimethyl-2,2'-bipyridine, 2,2'-biquinoline and (S,S)-6,6-bis-(1-methoxy-2,2'-dimethylpropyl)-2,2'-bipyridine. Following this, is reported the synthesis of tricyclic saturated imidazolium salts. Suzuki cross coupling of 4-chlorotoluene with phenylboronic acid was investigated in the presence of different imidazolium salts. This chapter concludes with a few suggestions for the synthesis of enantiomerically pure 2,6-bipiperidines. The fourth chapter is the experimental section and is dedicated to the methods of synthesis and characterization of the compounds mentioned in the previous chapters. X-ray reports regarding the crystallographic representation of the structures presented in chapter two and three are provided in chapter five.
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Collinson, John Michael. "Immobilised N-heterocyclic carbene metal complexes in catalysis." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/42227.

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Transition metal-based catalysts are one of the most powerful tools available to chemists and the development of ligand systems with which to modify their activity is a constant area of research. In the last twenty years N-Heterocyclic carbenes (NHCs) have established themselves at the forefront of organometallic chemistry. To increase the lifetime of the catalyst these ligands are increasingly being immobilised on supports as, this allows recovery and reuse while attempting to retain the activity. Cleaner, greener and safer processes are increasingly important and the recovery of the catalyst by simple separation also removes contamination and enables the possibility of re-use. This thesis describes the development of a new concept to immobilise transition metal complexes through an N-heterocyclic carbene ligand. The introductory Chapter provides an overview of transition metal catalysis, introducing the use of supported catalysis including the use of magnetic nanoparticles to aid the recovery of the catalyst systems. A discussion is included of N-heterocyclic carbene ligands, including their synthesis, activity in catalysis as ligands for metal complexes as well as attempts to support the systems and their use in various reactions. Chapter 2 provides an in-depth introduction to palladium catalysis, focusing on cross-coupling and dehalogenation reactions. The design of palladium catalysts, concentrating on palladium-NHC complexes and covers the use of supported catalysts. The synthesis and immobilisation of a novel palladium carbene complex is also described. The supported and unsupported complexes were screened in the Suzuki-Miyaura reaction and dehalogenation reaction. The activity and recycling properties of the supported catalyst system are discussed. The next Chapter outlines the use of copper-NHC complexes in the 1,3-dipolar cycloaddition reaction of azides and alkynes to form 1,2,3-triazoles. The preparation and characterisation of a novel N-heterocyclic carbene ligand is described, along with the construction of the supported copper systems. These catalysts were then investigated in the cycloaddition reaction and assessed for their activity and recovery. The scope of the reaction is also explored, investigating functional group tolerance. The final Chapter contains experimental procedures and characterisation data for all compounds synthesised during this project.
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Zhang, Pinglu. "Cyclodextrin-(N-Heterocyclic Carbene)-Metal Complexes for Cavity-Dependent Catalysis." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066380/document.

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Des complexes de Cyclodextrine (CD)-NHC-Métaux (NHC= Carbènes N-Hétérocycliques), comprenant des métaux tel que AgI, CuI et AuI ont été synthétisés. Une étude structurale a mis en évidence la position intra-cavitaire du métal, induisant des interactions C-H…M, C-H…X et π…X. L’influence du type de cavité (α-, β-, γ-CD) et du type de dérivés NHC (Imidazole, benzimidazole, triazole) a été étudiée. Les interactions diminuent avec l’augmentation de la taille de la cavité et en parallèle, celles-ci ont été amplifiées avec des dérivés NHC possédant un effet donneur plus fort. Les complexes de cuivre correspondants montrent une bonne réactivité pour la réaction d’hydroboration des alcynes. Il a de plus été observé que la sélectivité est dépendante de la taille de la cavité. En effet, alors que le complexe α-CD-Cu donne le produit linéaire, le complexe β-CD-Cu oriente vers la formation de l’isomère branché. Les espèces CD-Cu potentiellement impliquées dans le cycle catalytique ont été étudiées. Deux mécanismes différents sont ainsi proposés. Dans la réaction catalysée par le complexe α-CD-Cu, le processus catalytique a lieu en dehors de la cavité; tandis que lorsque la cavité est plus grande (β-CD) la catalyse a lieu à l’intérieur de la celle-ci. Par ailleurs, les complexes ont également montré une différente énantiosélectivité et régiosélectivité dans une réaction de cycloisomerization catalysée par des comlexes dor, en fonction de la taille de la cavité de ces catalyseurs. Les résultats catalytiques ont prouvé que les complexes CD-NHC-Métaux fonctionnent comme des catalyseurs pour lesquels la taille de la cavité influe sur la séléctivité
Cyclodextrin (CD)-NHC-Metal complexes (NHC=N-Heterocyclic Carbene), including the AgI, CuI and AuI complexes were synthesized. A structural study showed that the metal was inside the cavity, and induced by C-H…M, C-H…X and π…X interactions. Variations on α-, β-, γ-CD cavities and NHC derivatives (midazole, benzimidazole, triazole) were studied. When the size of the cavity increased, these interactions decreased. Furthermore, stronger σ-donating effects lead to stronger interactions. CD-Cu complexes showed good activity in catalytic hydroboration of alkynes. The selectivity is depending on the size of the cavity of the catalyst. α-CD copper complex gives linear hydroboration products, while β-CD copper complex yields the branched isomers. The CD-Cu species potentially involved in the catalytic cycle were studied, two different mechanisms were thus proposed. In the α-CD-Cu complex catalyzed reactions, the catalytic process takes place outside the cavity; while a bigger cavity β-CD permits the catalysis to take place inside the cavity. Furthermore, the gold complexes also show different enantioselectivity and regioselectivity in cycloisomerization using different cavity-based catalysts. Catalytic results evidenced the selectivity of a catalytic reaction is dependent on the cavity of the CD-NHC-metal complexes
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Brayshaw, Simon Keith. "Metal complexes bearing pendant alkynes and metal complexes of N-heterocyclic carbenes." University of Western Australia. School of Biomedical and Chemical Sciences, 2004. http://theses.library.uwa.edu.au/adt-WU2005.0017.

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This thesis is comprised of two parts. The first part describes the synthesis of cyclopentadienyltungsten complexes containing a pendant alkyne group (I), and the subsequent photo-induced intramolecular coordination of the alkyne, forming complexes such as II. Compounds containing intramolecularly coordinated alkynes are rare, and this is the first example using cyclopentadiene as the core ligand. The second part describes the synthesis and structural characterisation of a number of novel metal complexes containing N-heterocyclic carbene ligands, some containing particular functionality for taylored applications. New methods were used to form complexes of rhodium, iridium, silver and gold (eg. III, IV). Structural and spectroscopic properties of the complexes were correlated with electronic characteristics of the ancillary ligands. A number of rhodium and iridium complexes (eg. IV) derived from imidazolium-linked cyclophanes were synthesised and structurally characterised. Complexes of N-heterocyclic carbenes with pendant ionic groups were synthesised, and a preliminary examination of their catalytic activity in water was performed. N-Heterocyclic carbenes complexes containing an electron withdrawing nitro group were synthesised and the effect of the nitro group on metal-ligand bonding was examined.
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Martínez, Lombardía Alberto. "Heterogenized n-heterocyclic carbene metal complexes for selective catalysis." Doctoral thesis, Universitat Rovira i Virgili, 2016. http://hdl.handle.net/10803/386577.

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La present tesi doctoral està adreçada al desenvolupament de catalitzadors que permetin dur a terme processos sintètics de manera més eficient i sostenible. Es presenten dues noves famílies de catalitzadors suportats, ambdues pertanyents al grup de complexos organometàl·lics moleculars immobilitzats sobre un suport sòlid. La primera família inclou complexos de Pd amb lligands carbè N-heterocíclic monodentats de gran impediment estèric, immobilitzats sobre òxids inorgànics, com ara sílicas, alúmina o òxid de titani. Aquesta família de catalitzadors es va aplicar en dos tipus de reaccions: i) reaccions d'acoblament C-C i ii) semireducción d'alquins. Entre les reaccions d'acoblament esmentades, els complexos de [Pd (NHC)] immobilitzats es van aplicar a les reaccions de Suzuki, Heck i Sonogashira, i es van avaluar en base a la seva activitat, selectivitat i reciclabilitat. A més, en el cas de les reaccions de Suzuki i Sonogashira, aquests catalitzadors també es van aplicar en condicions de flux continu. L'aplicació d'aquesta família de catalitzadors en la semireducció selectiva d'alquins es va dur a terme utilitzant dues metodologies diferents: utilitzant hidrogen molecular, o bé utilitzant el sistema trietilamina / àcid fòrmic com donador de H (condicions de transferència d'hidrogen). La segona família de catalitzadors suportats contempla complexos de Rh (I) estabilitzats amb lligands bidentats de tipus carbé N-heterocíclic, amb quiralitat axial, i funcionalitzats amb un grup piré. La immobilització d'aquests complexos de Rh sobre la superfície de nanotubs de carboni "multi-walled" va tenir lloc mitjançant interaccions de tipus "pi-pi stacking" entre la superfície dels nanotubs i el grup piré present en el lligand. Finalment, es presenten els resultats obtinguts en l'aplicació d'aquests complexos de Rh en diversos processos catalítics.
La presente tesis doctoral se centra en el desarrollo de catalizadores que permitan llevar a cabo procesos sintéticos de manera más eficiente y sostenible. Se presentan dos nuevas familias de catalizadores soportados, ambas pertenecientes al grupo de complejos organometálicos moleculares inmovilizados sobre un soporte sólido. La primera familia incluye complejos de Pd con ligandos carbeno N-heterocíclico monodentados de gran impedimento estérico, inmovilizados sobre óxidos inorgánicos, como sílicas, alúmina u òxido de titanio. Esta familia de catalizadores se aplicó en dos tipos de reacciones: i) reacciones de acoplamiento C-C y ii) semireducción de alquinos. Entre las reacciones de acoplamiento mencionadas, los complejos de [Pd(NHC)] inmovilizados se aplicaron en las reacciones de Suzuki, Heck y Sonogashira, y se evaluaron en base a su actividad, selectividad y reciclabilidad. Además, en el caso de las reacciones de Suzuki y Sonogashira, estos catalizadores también se aplicaron en condiciones de flujo continuo. La aplicación de esta familia de catalizadores en la semireducción selectiva de alquinos se llevó a cabo utilizando dos metodologías diferentes: utilizando hidrógeno molecular, o bien utilizando el sistema trietilamina/ácido fórmico como dador de H (condiciones de transferencia de hidrógeno). La segunda familia de catalizadores soportados contempla complejos de Rh(I) estabilizados con ligandos bidentados de tipo carbeno N-heterocíclico, con quiralidad axial, y funcionalizados con un grupo pireno. La inmovilización de estos complejos de Rh sobre la superficie de nanotubos de carbono "multi-walled" tuvo lugar mediante interacciones de tipo "pi-pi stacking" entre la superficie de los nanotubos y el grupo pireno presente en el ligando. Finalmente, se presentan los resultados obtenidos en la aplicación de estos complejos de Rh en varios procesos catalíticos.
The present PhD thesis aims at contributing to the development of more efficient and sustainable synthetic processes through catalysis. In this regard, two families of new solid-supported catalysts are presented. Both families belong to the group of molecularly defined organometallic complexes immobilized onto a solid support. The first family includes Pd complexes of sterically hindered monodentate N-Heterocylic Carbene ligands supported onto inorganic oxide materials, namely silicas, alumina and titania. This family of catalysts was applied in two types of reactions: i) C-C cross-couplings and ii) semireduction of alkynes. Among cross-coupling reactions, the supported [Pd(NHC)] complexes could be applied in Suzuki, Heck and Sonogashira couplings and their performance was assessed in terms of activity, selectivity and reusability. For the Suzuki and Sonogashira couplings, the catalysts were also appied under continuous flow conditions. The application of this family of catalysts in the selective reduction of alkynes was carried out following two different methodologies: using hydrogen gas, or using triethylamine/formic acid as the H-donor system (transfer hydrogenation conditions). The second family of solid-supported catalysts features Rh(I) complexes bearing axially chiral bidentate N-Heterocyclic carbene ligands functionalized with a pyrene moiety. Immobilization of these Rh complexes onto the surface of multi-walled carbon nanotubes was achieved by means of "pi-pi stacking interactions" between the surface of the nanotubes and the pyrene moiety present in the ligand. Results obtained from the application of these complexes as catalysts in various reactions are presented.
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Ahmed, Aminu. "Mixed donor carbene pyridyl ligands and their metal complexes." Thesis, Cardiff University, 2008. http://orca.cf.ac.uk/54889/.

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This thesis describes the synthesis of a series of Ag(I), Pd(II), Rh(I) and Ir(I) complexes of quinoline functionalised nucleophilic heterocyclic carbene (NHC) ligands. The transmetallation properties of the Ag(I) complexes were utilised to prepare the corresponding Pd(II), Rh (I) and Ir(I) (NHC) complexes. A series of quinoline based imidazolium, pyrimidinium salts were prepared and characterised as NHC ligand precursors. Ag(I)(NHC) complexes were prepared by the reaction of the quinoline functionalised salts with Ag20 in DCM. All complexes were spectroscopically characterised and the results of single X- ray crystallographic studies are reported for two of the complexes and the geometry around the silver cation was observed to be distorted linear. Two quinoline based palladium (II) (NHC) complexes were prepared via transmetallation Ag(I)(NHC) complexes is reported. The synthesis of a series of methylene bridged quinoline functionalised Rh (I) and Ir(I) (NHC) complexes through transmetallation of the Ag(I)(NHC) complexes is reported and the results of single X-ray crystallographic studies are reported for most of the complexes showing consistent pattern in term of bond lengths and angles. Two of the Ir(I) (NHC) complexes were tested as catalysts in transfer hydrogenation reactions, showing good activity at low Ir loadings.
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Kelly, Roy A. III. "New Metal-NHC Complexes: Synthesis, Characterization, and Uses." ScholarWorks@UNO, 2014. http://scholarworks.uno.edu/td/1817.

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N-Heterocyclic Carbenes (NHC) present a viable alternative to traditional phosphine ligands in a variety of organometallic mediated catalytic reactions. Singlet ground-state carbenes are stabilized by the push-pull presence of two adjacent nitrogen atoms in an imidizolium 5-membered ring, allowing neutral electron donor properties. The ability to synthesize a variety of NHC ligands with differing steric and electronic properties is possible by changing the sustiuents on the nitrogen atoms of the imidizolium. Tunable characteristics and enhanced chemical and thermal stability give NHC’s an advantage over phosphines in many catalytic systems. This dissertation focuses on the use N-Hetercyclic Carbenes in a variety of organometallic complexes. The synthesis of NHC complexes with a variety of transition metals is described. The transition metals complexed with NHC’s include palladium, iridium, nickel and ruthenium. The catalytic activity of the metal-NHC complexes is investigated as well.
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Germeroth, Anne Inger. "Reactivity of electropositive f-block metal N-heterocyclic carbene complexes." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/9519.

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The combination of Lewis acidic f-block metals and a labile nucleophilic carbene can be an excellent means to activate small molecules such as silanes, CO2 and other traditionally inert substrates. Furthermore, bidentate alkoxy-NHC ligands have shown promise in the support of unusual high oxidation state organometallic complexes, including examples of CeIV, PdIV and UVI. In this thesis the synthesis and reactivity of a series of f-block metal NHC complexes is described. Chapter One introduces N-heterocyclic carbenes and their f-block metal complexes, in particular of cerium, praseodymium and uranium. Furthermore, it will give an overview of small molecule activation by NHCs, lanthanides and specifically [Ce(LAr)N"], (L = OC(CH3)2CH2(CNCH2CH2NMes) the magnetic properties and use of lanthanides e.g. as single molecule magnets and oxo-functionalisation of the uranyl moiety. Chapter Two describes the addition-elimination reaction chemistry of CeIII and UIV NHC complexes in which polar reagents add in a heterocyclic fashion across the MNHC bond. It also describes the synthesis of the lithium salt of the alkoxycarbene proligand [LiLAr]4 and its reactivity towards f-element halide and aryloxide salts. A series of reactions to target the formation of metal-metal bonds is described. Chapter Three focuses on the synthesis of novel cerium and praseodymium complexes [Pr(LAr)N"2], [Pr(LAr)2N"], [Pr(OAr2,6-tBu)3] and [Ce(OAr2,6-tBu)3] and their reactivity towards oxidants. A series of alkoxide bridged lanthanide dimers [(Cl)Ce(μ- LAr)2Ce(Cl)2], [N"(LAr)Ce(μ-OAr2,6-tBu)OAr2,6- 2Ce(LAr)N"] and [N"(Cl)Pr(μ LAr)2Pr(Cl)N"] have been made and characterised including by SQUID variable temperature magnetometry. Chapter Four evaluates the synthesis and reactivity of uranyl complexes [UO2(LAr)2], [UO2N"2(py)2] and [UO2(OAr2,6-tBu)2(py)2], specifically their reactivity towards haloboranes in different solvents. Additionally, the oxo-functionalisation of uranyl compounds with haloboranes is discussed. Chapter Five draws conclusions and provides a summary of the work presented. Chapter Six comprises the experimental details and analytical data.
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Books on the topic "Metal carbene complexes"

1

Kühl, Olaf. Functionalised N-heterocyclic carbene complexes. Hoboken, N.J: Wiley, 2009.

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Kühl, Olaf. Functionalised N-heterocyclic carbene complexes. Chichester, U.K: Wiley, 2010.

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Functionalised N-heterocyclic carbene complexes. Hoboken, N.J: Wiley, 2009.

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Kühl, Olaf. Functionalised N-heterocyclic carbene complexes. Hoboken, N.J: Wiley, 2009.

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Farrell, Michael A. Highly polarisable derivatives of bridging carbene and carbyne di-iron complexes. Dublin: University College Dublin, 1998.

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6

Kreißl, F. R., ed. Transition Metal Carbyne Complexes. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1666-4.

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R, Kreissl F., and North Atlantic Treaty Organization. Scientific Affairs Division., eds. Transition metal carbyne complexes. Dordrecht: Kluwer Academic, 1993.

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Behr, Arno. Carbon dioxide activation by metal complexes. Weinheim: VCH, 1988.

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Chauvin, Remi, and Yves Canac, eds. Transition Metal Complexes of Neutral eta1-Carbon Ligands. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-04722-0.

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Transition metal complexes of neutral [Eta]1-carbon ligands. Heidelberg: Springer Verlag, 2010.

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Book chapters on the topic "Metal carbene complexes"

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Busetto, L., V. Zanotti, S. Bordoni, L. Carlucci, and A. Palazzi. "Carbyne to Carbene Ligand Conversion in Dinuclear Complexes." In Transition Metal Carbyne Complexes, 137–47. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1666-4_17.

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Jeletic, Matthew, and Adam Veige. "N-Heterocyclic Carbene Complexes in Reactions Involving Carbon Monoxide." In Catalysis by Metal Complexes, 217–35. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-2866-2_9.

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Bozec, Hubert, Dominique Devanne, and Pierre H. Dixneuf. "Metal Carbene Complexes from Alkynes." In Advances in Metal Carbene Chemistry, 107–21. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2317-1_12.

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Cavell, Kingsley J., and Adrien T. Normand. "N-Heterocyclic Carbene Complexes: Decomposition Pathways." In Catalysis by Metal Complexes, 299–314. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-2866-2_13.

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Lai, R. "Dioxophosphinomethylidene Molybdenum (VI) Complexes." In Advances in Metal Carbene Chemistry, 171–83. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2317-1_22.

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Mansuy, D., and J. P. Mahy. "Nitrene and Carbene Transfer Catalyzed by Metalloporphyrins." In Catalysis by Metal Complexes, 175–206. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-017-2247-6_6.

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Jurčík, Václav, and Catherine S. J. Cazin. "N-Heterocyclic Carbene Complexes in Oxidation Reactions." In Catalysis by Metal Complexes, 237–52. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-2866-2_10.

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Briel, Oliver, and Catherine S. J. Cazin. "N-Heterocyclic Carbene Complexes in Industrial Processes." In Catalysis by Metal Complexes, 315–24. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-2866-2_14.

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Luan, Xinjun, Reto Dorta, Anita Leitgeb, Christian Slugovc, Sascha Tiede, and Siegfried Blechert. "N-Heterocyclic Carbene Complexes in Olefin Metathesis." In Catalysis by Metal Complexes, 63–103. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-2866-2_3.

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Louie, Janis. "N-Heterocyclic Carbene Complexes in Cyclisation Reactions." In Catalysis by Metal Complexes, 131–56. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-2866-2_5.

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Conference papers on the topic "Metal carbene complexes"

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Kijima, M., Y. Sakai, and H. Shirakawa. "Electrochearcal synthesis of carbyne catalyzed by nickel complex." In International Conference on Science and Technology of Synthetic Metals. IEEE, 1994. http://dx.doi.org/10.1109/stsm.1994.835618.

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Raj, S., and R. Raj. "Analytical Tools for the Analyses of Coal and its Combustion Products." In ASME 1986 International Gas Turbine Conference and Exhibit. American Society of Mechanical Engineers, 1986. http://dx.doi.org/10.1115/86-gt-261.

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Coal, due to its heterogenous nature and complex structure; physical, chemical and petrographic, introduces two-fold complications during its combustion in power generation. Organic and inorganic constituents in various petrographic states alter chemically and physically. The products of coal combustion; unburned carbon, deposits, oxides of metals and non-metals, metal and non-metal complexes, need to be identified qualitatively and quantitatively to increase the coal combustion efficiency and to optimize the durability of power plant components. This paper will describe the usage of various analytical tools like NMR, ESR, IR, Electron Microscopy, X-Ray, Fluorescent Microscopy coupled with Wet Analysis to analyze coal and its derivatives. Each spectroscopy will be related to a specific aspect of coal and its derivatives. The limiting conditions and the range of application of each of the tools will be provided. The knowledge of these ranges will help in monitoring accurate emission levels of a particulate concentration, NOx, SOx and will control several phenomena such as deposition, corrosion and erosion.
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Maeda, Kazuhiko, Ryo Kuriki, Keita Sekizawa, and Osamu Ishitani. "Metal-complex/semiconductor hybrids for carbon dioxide fixation." In SPIE Optics + Photonics for Sustainable Energy, edited by Shaohua Shen. SPIE, 2015. http://dx.doi.org/10.1117/12.2187341.

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Arakelian, S., S. Kutrovskaya, A. Kucherik, A. Osipov, A. Povolotckaia, A. Povolotskiy, and A. Manshina. "Laser-induced synthesis of a nanostructured polymer-like metal-carbon complexes." In SPIE Photonics Europe, edited by David L. Andrews, Jean-Michel Nunzi, and Andreas Ostendorf. SPIE, 2016. http://dx.doi.org/10.1117/12.2225452.

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Thursby, G. J., A. MacLean, H. Hogg, and B. Culshaw. "Ultrasound detection of damage in complex carbon fibre/metal structures." In Nondestructive Evaulation for Health Monitoring and Diagnostics, edited by Tribikram Kundu. SPIE, 2006. http://dx.doi.org/10.1117/12.659043.

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Sapronov, Dmitry, Michael Mezencev, Telman Karimbaev, Sergey Reznik, and Pavel Prosuntsov. "Complex Design Method of Ceramic Blades and Metal Disk Connection." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90875.

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Abstract This paper presents a complex approach to designing ceramic blades dovetail joints. Two ceramic materials were considered: diamond reinforced silicon carbide and hot pressed silicon nitride (only in contact testing). The model blades were made from diamond reinforced silicon carbide due to its availability and mature technology. Part 1 describes the models of mechanical and thermal contact and contains experimental data on contact strength and thermal contact conductance. Part 2 investigates the effect of stress concentration and scale factor on the fracture of ceramic test pieces. Part 3 proposes a theoretical-experimental method to estimate friction coefficient in a dovetail joint. We also investigated the character of the ceramic blades fracture during the rotor spin-up. Part 4 deals with automating the design process of the ceramic blades dovetail joints using experimental data.
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Zimmermann, Kristen A., Jianfei Zhang, Harry Dorn, Christopher Rylander, and Marissa Nichole Rylander. "Synthesis and Cytotoxicity Analysis of Carbon Nanohorn-Quantum Dot Complexes." In ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53968.

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Carbon nanoparticles have the potential to significantly impact the medical field over the next decade. Currently, carbon nanoparticles are being studied for a myriad of applications, including drug delivery, selective laser therapy, imaging, and biosensing. The most common type of carbon particles being investigated are carbon nanotubes (CNTs). CNTs are attractive materials for medical applications because of their physical properties and the ease with which they can be surface modified; however, there is a great deal of controversy over their possible toxicity. A more novel type of CNT that was discovered in 1999 by Iijima et al. is the carbon nanohorn [1]. Individual single-walled nanohorns (SWNHs) are single graphene sheets that roll into a conical open ended structure. The open ends of these cones are then attracted to one another through van der Waals interactions and form a flower-like final structure [2]. SWNHs are more favorable for medical applications because they are produced without the use of metal catalysts abating the concern of toxicity associated with CNTs.
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Garcia, David, R. Joey Griffiths, and Hang Z. Yu. "Additive Friction Stir Deposition for Fabrication of Silicon Carbide Metal Matrix Composites." In ASME 2020 15th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/msec2020-8532.

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Abstract Additive friction stir deposition is an emerging solid-state additive manufacturing technology that has shown promise for bulk fabrication of metals and metal-matrix composites. Here, we perform a preliminary investigation into the influence of tool geometries on the particle distribution and matrix-particle coherence of SiC in the matrix of Aluminum Alloy 6061 and commercially pure Copper. Two tool geometries have been used: (1) a simple, featureless tool and (2) a complex geometry tool with four surface protrusions. For the simple tool geometry, the Al-SiC is observed to have less uniform bulk distribution of the reinforcement phase, resulting in regions of highly concentrated SiC reinforcement (up to 69 area%). The Cu-SiC sample produced with the simple geometry tool has a homogeneous distribution. The samples produced with the complex geometry tool show more uniform distribution of SiC reinforcement throughout the bulk of the deposit with local reinforcement concentrations reaching up to 42 area% and 28 area% for the Al and Cu matrix, respectively. All tool geometries create samples with good interfaces that have continuous contact between the particle and matrix phases, even including particles with sharp angles and non-spherical surfaces. Further optimization of tool geometries and processing conditions can lead to improved control of the reinforcement phase distribution and enable design of metal-matrix composites with tailored site-specific properties.
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Fotouh, Ahmed, R. El-Hebeary, M. El-Shennawy, David Tulloch, Jason Davio, and Rob Reid. "Integrated Experimental Procedures Assessing Hydrogen Induced Cracking Susceptibility." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-46011.

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This study proposes a complete set of integrated experimental procedures to assess the risk of Hydrogen Induced Cracking (HIC) using implant test. The proposed experimental procedures assess HIC susceptibility in base metals using two measures: the implant static fatigue limit stress (σimp); and Heat Affected Zone (HAZ) maximum hardness (HV10MAX). The base metal susceptibility to HIC was evaluated by examining the effect of three welding factors: the critical cooling time between 800 °C and 500 °C (t800/500); the base metal carbon equivalent (CE); and the diffusible Hydrogen content (H). A 3-D mapping technique was used to demonstrate the interactive integrated relationships among the three examined welding factors (i.e. t800/500, CE and H) and the susceptibility of the base metal to HIC. Using the 2-D projection of the developed 3-D mapping, it was proven that the diffusible hydrogen content (H) had more effect on the HIC susceptibility of High Strength Low Alloy (HSLA) steel compared to the effect of H on the HIC susceptibility of Carbon-Manganese (C-Mn) steel.
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Sheikh-Ahmad, Jamal, and Rahul Yadav. "Force Prediction in Milling of Carbon Fiber Reinforced Polymers." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81909.

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Fiber reinforced polymers are widely used in the transportation, aerospace and chemical industries. In rare instances these materials are produced net-shape, and secondary processing such as machining and assembly may be required to produce a finished product. Because fiber reinforced polymers are heterogeneous materials, they do not machine in a similar way to metals. Thus, the theory of metal machining is not valid for the analysis of machining of fiber reinforced composites. Previous attempts in modeling this problem have adopted Merchant’s theory for metal cutting by assuming that chip formation takes place in a shear plane where the inclination angle is determined by the minimum energy principle. This class of models showed that model predictions are valid only for fiber orientations less than 60°. Furthermore, these models are incapable of predicting cutting forces for multidirectional laminates or complex tool geometry. The work presented here focuses on providing a predictive model for the cutting forces in milling both unidirectional and multidirectional laminates. The model is based on the specific cutting energy principle and accounts for a wide range of fiber orientations and chip thickness. Results from this model were found to be in good agreement with experimental results over the entire range of fiber orientations from 0 to 180°.
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Reports on the topic "Metal carbene complexes"

1

Norton, J. R. Catalytic applications of mono- and dinuclear complexes containing metal-carbon sigma bonds. Final report, November 1, 1993--October 31, 1996. Office of Scientific and Technical Information (OSTI), December 1996. http://dx.doi.org/10.2172/541813.

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