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Showing 1 to 20 of 200 for “"Pyridyl"”.
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N-Phosphino-pyridyl Imines: Flexible, Multi-functional Reagents
… coordination studies of a range of N-phosphino-pyridyl imines with the general structure (C5H5N)(Ar)C=NPR2 (1) {R = alkyl or aryl and Ar = aryl} are reported in chapter II. The molecular structures of their palladium dichloride complexes are presented, highlighting the effect of differing …
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Self-Assembly and Gelation Behaviour of Pyridyl Urea Complexes
Bis(3-pyridyl)ureas with ethylene, propylene, butylene, phenylene and napthy- lene spacer groups were synthesised by the reaction of 3-isocyanato-pyridine, pre- pared in situ from nicotinoyl azide, with the appropriate diamine. Each ligand was crystallised and their structures were solved using …
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Synthesis and Recognition Properties of Functionalized Nanomaterials From Pyridyl Urea Macrocycles
… pot synthesis of three symmetrical macrocyclic pyridyl urea hosts. X-ray crystal structures show the conformational difference between the free host and the host*guest complexes. These solid-state studies also revealed the interactions that are important for binding cations. The host* guest …
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The Condensation of Grignard Reagents With 3-Pyridyl and 3-Quinolyl Ketones
Made available in DSpace on 2014-12-05T19:36:35Z (GMT). No. of bitstreams: 1 0020877.pdf: 3184477 bytes, checksum: 2352efb275bbed320909b8abe8913fe0 (MD5) Previous issue date: 1957
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Multidentate Alkanethiols with Cyclohexyl and Pyridyl Frameworks Forming Self-Assembled Monolayers on Gold
… to the chelating effect. Finally, a new pyridyl-based adsorbate (C18OPDSH) was synthesized and used to form SAMs. This SAM was characterized and the data was compared to those generated from the normal alkanethiol C18SH and C18OBDSH. XPS spectra display that a lone electron pair of …
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Tris-Pyridyl Ligands and Beyond: Modifications Derived from the Bridgehead and Donor Vector
Abstract Tris-Pyridyl Ligands and Beyond: Modifications Derived from the Bridgehead and Donor Vector – Jessica Ellen Waters The development of new classes of ligands is a fundamental and ongoing challenge in modern chemistry, and a cornerstone in modern catalysis, supramolecular assembly and …
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Main Group Hydrogen-Bond Donors and Pyridyl Ligands for Supramolecular and Coordination Chemistry
… coordination complexes of the type [LnM(PyridylNH)P(µ-NtBu)]2 (M = transition metal, L = supporting ligand). By optimisation of the NH bond polarity we achieve halide binding approximately one order of magnitude stronger than for organic analogues. We find that metal coordination renders …
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Main Group Elements in Catalysis: Alkene/Alkyne Activation Using Organoaluminium(III)–Pyridyl Dimers
… The focus of this study was organoaluminium pyridyl dimers of the type [R2Al(2- py')]2 (R = Me, iBu; py'= substituted pyridyl group), which have been previously shown to be involved in a unique “pyridyl ring-flipping” (cis/trans isomerism) equilibrium. Five new dimers of the type …
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Tripodal Inorganic 2-Pyridyl-phosphine Ligands and Unsymmetrical Analogues: Towards New Applications in Catalysis
… are used extensively in homogeneous catalysis, 2-pyridyl-phosphines have been largely overlooked in this field. However, such ligands offer great potential for catalytic applications through the combination of two ligand sites with different donating and accepting properties. In Chapter 1 previous …
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Supramolecular Ru II, Pt II Complexes Bridged by 2,3,5,6-tetrakis(2-pyridyl)pyrazine (tppz)
… and tppz is 2,3,5,6-tetrakis(2-pyridyl)pyrazine. These two supramolecular assemblies display remarkably different stereochemistry, electrochemistry and photochemistry. The chapters in this document deal with a multidisciplinary project that is fundamental to the design and …
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Effects of different ligands on the binding of a palladium center in a pyridyl spaced dicarbene
The reduction of carbon dioxide by two electrons to generate carbon monoxide is an energetically uphill transformation with implications for solar fuel production. Accordingly, we have developed a suite of compounds consisting of [PDCRPdL]X–, (R= methyl, ethyl, isopropyl, cyclohexyl, …
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Robust Nickel Catalysts Supported By Biaryl-Bridged Pyridyl-N-Heterocyclic Carbenes For Carbon Dioxide Reduction To Value-Added Products
… catalysis. We report a family of biaryl-bridged pyridyl-N-heterocyclic carbene-based ligands and their corresponding nickel complexes. Ligand synthesis, structural characterization of complexes, and their application in electrocatalytic CO2 reduction are discussed.
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Mechanistic Studies of Bimolecular Electron Transfer Self-Exchange Rates of Ruthenium Ammine Pyridyl Complexes Measured by NMR Line Broadening Techniques
… in D<sub>2</sub>O (where L is a substituted pyridyl ligand) were investigated by dynamic NMR measurements. Significant rate enhancement was observed for the cases of L = 3-phenylpyridine and 4-phenylpridine due to possible π-π stacking between Phpy ligands. These observations matche well with …
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Unusual Electron Transfer Rate Effects due to Pyridyl Ring Substituents and Trace Group VIII b Hexacyano Complexes as Added Salts
<p>The rates of pseudo-self-exchange electron transfer reactions between [(NH<sub>3</sub>)<sub>5</sub>Ru<sup>II</sup>L]<sup>2+</sup> and [(NH<sub>3</sub>)<sub>5</sub>Ru<sup>III</sup>L’]<sup>3+ </sup> at reactant concentrations of 1.0 х 10<sup>-4</sup> M (where L, L’ = substituted pyridines) and the …
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REDUCTIVE ELIMINATION OF (DPMS)PTIV COMPLEXES DERIVED FROM ISOMERIC 2-BUTENEs AND 2-BUTYNE (DPMS=DI(2-PYRIDYL)METHANE SULFONATE)
The (dpms)PtII complexes (dpms = di(2-pyridinyl)methanesulfonate)derived from some cyclic olefins can be readily oxidized to PtIV oxetanes, followed by reductive elimination to produce corresponding epoxides. A catalytic version of this reaction can potentially be achieved if decomposition of …
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Matrix Isolation of Aryl(trifluoromethyl)carbenes, Heteroaryl(trifluoromethyl)carbenes and Phenylbis(trifluoromethyl)carbenes
… 1-naphthyl(trifluoromethyl)carbene, 4-pyridyl (trifluoromethyl)carbene, 2-pyridyl(trifluoromethyl)carbene, 3-pyridyl (trifluoromethyl)carbene, 3-bromo-5-pyridyl(trifluoromethyl)carbene, meta-phenylbis(trifluoromethyl)carbene and paraphenylbis(trifluoromethyl)carbene in low temperature …
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