Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 92 for “"NHC"”.
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Highly Active Iron-NHC Complexes for Carbonyl Hydrosilylation
… properties of the N-Heterocyclic carbene (NHC) backbone, an extremely active catalyst was found for the hydrosilylation of carbonyl groups with PMHS under mild conditions. In Chapter 3, a follow-up study on this highly active catalyst is presented; several modifications on the N-wingtip of …
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Synthesis and analysis of low-valent NHC supported nickel complexes
… on the synthesis of N-heterocyclice carbene (NHC) supported nickel complexes and their reactivity in bond-breaking and bond forming reactions. The body of this work discusses isolation of (NHC)Nickel(I) alkoxides and their subsequent chemical transformations into different (NHC)Nickel …
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Synthetic, Structural and Thermochemical Studies of N-Heterocyclic Carbene (NHC) and Tertiary Phosphine Ligands in the Ni(CO)2(L)x (L-PR3, NHC) Systems
… two N-heterocyclic carbenes of the type Ni(CO)2(NHC)2 (NHC = ICy [N, N'-bis(cyclohexylimidazol)-2-ylidene], IMes [N, N'- bis(2, 4, 6-trimethylphenyl)-imidazol)-2-ylidene]) have been prepared. The complexes Ni(CO)2(ICy)2 (8) and Ni(CO)2(IMes)2 (9) have been synthesized and characterized by single …
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Early Transition Metal CCC-NHC Pincer Complexes: Synthesis, Characterization, and Catalysis
… methodology for the metalation of CCC-NHC pincer ligand precursors has been extended to other early-transition metals and ligands. Specifically, synthetic results for the preparation of imidazole based CCC-NHC pincer Ti (IV), CCC-NHC pincer Ta (V) will be discussed. In addition, the …
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Synthesis of Well-Defined N-Heterocyclic Carbene (NHC) Complexes of Late Transition Metals
N-heterocyclic carbenes (NHCs) have emerged as appropriate replacements for phosphines to synthesized highly active metal complexes in homogeneous catalysis. The advantages of NHCs over phosphines include ease of handling, minimal toxicity and powerful electron donating properties. They bind …
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Synthesis, Characterization And Application Of Pt Complexes With Pincer Ccc-Bis(Nhc) Ligands
… route for the synthesis of CCC-bis(NHC) pincer ligand supported transition metal complexes was extended to Pt. Several platinum complexes were synthesized. The identity of these complexes was confirmed through multiple technologies, including nuclear magnetic resonance spectroscopy, …
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Synthesis and Characterization of a Series of Ag(I) and Cu(I) NHC Bridged Triangular
AbstractA series of picolyl-substituted NHC-bridged triangular complexes of Ag(I) and Cu(I)were prepared upon reaction of the corresponding ligand precursors, [HSim(CH2py)2]BF4 (1),[HSim(CH2pyCH3)2]BF4 (2), [HSim(CH2pyCl)2]PF6 (3), [HSim(CH2pyBr)2]PF6 (4),[HSim(CH2isoquin)2]PF6 (5), …
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Scanning Probe Study of N-Heterocyclic Carbene Self-Assembly on Coinage Metal Surfaces
… anchor. More recently, N-heterocyclic carbenes (NHCs) have gained interest due to their increased oxidative and thermal robustness relative to the thiol. Since the emergence of NHCs in surface science, several key insights into how their structure relates to their adsorption motif have become …
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INTERMOLECULAR COMPLEXES OF GERMANIUM(II
… diisopropyl substituted N-heterocyclic carbene (NHC) ligand were synthesized by the addition of two equivalents of either NHGa' or NHC to tetramesityldigermene (Mes2Ge=GeMes2). The complexes [NHGa-GeMes2] and NHC- GeMes2 are the first two examples of a transient germylene (Mes2Ge) being …
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Design and modification of rhodium and iridium N-heterocyclic carbene complexes for asymmetric transfer hydrogenation and antimicrobial activity
… utility of noble metal N-heterocyclic carbene (NHC) complexes. The first project details the design of iridium NHC amino acid complexes for asymmetric transfer hydrogenation (ATH) of prochiral ketones. Iridium(I) bis-NHC complexes were found to undergo oxidative addition with a variety of …
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Meeting the challenges: carbon-hydrogen bond activation and cancer treatment
… is focused on studies of N-heterocyclic carbene (NHC) palladium(IV) intermediates, which are involved in oxidative addition mediated C-C, and C-O bond formation processes as well as in C-Cl bond forming reactions via a reductive elimination process. Bis-NHC-Pd(II) complexes have been reported as …
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Job Satisfaction among Workers in the Construction Industry: A Case of National Housing Corporation
… workers in construction industry, a case of NHC. The general objective was to investigate job satisfaction among workers in the construction industry. The specific objectives were to determine level of job satisfaction among workers in the construction industry, to analyze techniques used by …
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ANION EFFECTS IN HOMOGENOUS PALLADIUM CATALYSIS AND LUMINESCENT PROPERTIES OF COPPER(I) COMPLEXES BEARING A WEAKLY-COORDINATING ANIONIC N-HETEROCYCLIC CARBENE LIGAND
… carbene ligand that bears a borate moiety of the NHC backbone. Facile dissociation of a dimethyl sulfide ligand with metal alkoxide/phenoxides/thiophenoxides affords sodium or potassium salts. With these anions in hand, ion pairs are isolated in polar solvents and in the solid state. Au anions …
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Coinage Metal Chalcogenide Clusters with N-Heterocyclic Carbene Ancillary Ligands
… – group 16 clusters with N-heterocyclic carbene (NHC) ligands. The clusters were prepared from reactive group 11 trimethylsilylchalcogenolate reagents (NHC-M-ESiMe3; M = Cu, Au; E = S, Se, Te) by silane deprotection reactions with phosphine- or phosphite-solubilized group 11 acetates (R3P-M-OAc; M …
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CERBERUS-TYPE TRISANIONIC TRISNHC AND ITS ZWITTERIONIC GOLD AND SILVER COMPLEXES
… multitopic nonchelating N-heterocyclic carbenes (NHCs), limited progress has been made in the development of their anionic counterparts. This thesis describes the synthesis and characterization of a novel trianionic NHC. The corresponding thione was generated through an NMR experiment of the free …
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A New 2,1,3-Benzothiadiazole-Fused N-Heterocyclic Carbene and Its Metal Complexes
… the last few decades, N-heterocyclic carbenes (NHCs) have emerged as a powerful class of carbon-based ligands. Owing to their unique electronic and steric properties, they have been incorporated in a large variety of catalytically active metal complexes. One of the strategies that have been used …
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Catalytic C-N and C-F bond formation by organometallic group 11 complexes
… presents a study of the reaction between an (NHC)gold(I) fluoride complex (NHC = N-heterocyclic carbene) and alkynes (Chapter 1). Gold(I) and fluoride add trans across the triple bond of 3-hexyne and 1-phenyl-l-propyne to form (fluorovinyl)gold(I) complexes, with exclusive geminal arrangement …
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N-Heterocyclic Carbenes of the Late Transition Metals: A Computational and Structural Database Study
… in late transition metal N-heterocyclic carbene (NHC) complexes is reported. The results illustrate a metal-carbon bond for these complexes, approximately 4% shorter than that of a M-C single bond found in metal alkyl complexes. As a consequence of this result, two hypotheses are investigated. The …
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Dianionic Janus-Type N-Heterocyclic Carbenes and their Zwitterionic Gold and Silver Metal Complexes
… multitopic nonchelating N-heterocyclic carbenes (NHCs), limited progress has been made in the development of anionic counterparts. This thesis describes the synthesis and characterization of two new dianionic bis(maloNHC). The corresponding thiones were generated by the reaction of the free …
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