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 37 for “"Nuclearity"”.
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New high nuclearity carbonyl clusters
… and Au-Fe carbonyl clusters. Most new high-nuclearity rhodium carbonyl clusters have been obtained by redox condensation of preformed rhodium clusters reacting with a species in a different oxidation state generated in situ by mild oxidation. In particular the starting Rh carbonyl clusters …
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Low-nuclearity titanium alkoxides and their rhodium derivatives
The reaction of Ti(OPri)4 with 0.078 equiv. of 10 atom% 17O enriched water and 0.6 equiv. of MeOH in i-PrOH solution gave [Ti3O](OPr i)9(OMe) (1). A single crystal X-ray diffraction study of this material indicated that 1 contains two crystallographically-independent Ti3(mu3-O)(mu3-OMe)(mu2-OPr …
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Synthesis, Structure, and Reactivity of High-Nuclearity Carbido Clusters of Rhenium
The cluster anion (Re$\sb7$C(CO)$\sb{21}\rbrack\sp{3-}$ reacts with late transition metal-based electrophiles to yield the mixed-metal clusters (Re$\sb7$C(CO)$\sb{21}$ML$\sb{\rm n}\rbrack\sp{2-}$ and with H$\sp+$ to yield the hydrido species (HRe$\sb7$C(CO)$\sb{21}\rbrack\sp{2-}$. These complexes …
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Tritium Matters: Constructing Nuclearity and Navigating Ambivalence of a Unique Material
… Each phase is characterized by a dominant "nuclearity" and situated in context of "nuclear exceptionalism" (Hecht 2014) that directly and indirectly affects material conditions, elite decision-making, and radiological impacts on the environment and human health. Because it is pervasive, …
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High-Nuclearity Lanthanide(III) Complexes as Single-Molecule Magnets and Luminescent Materials
The employment of the bridging/chelating Schiff base ligands, N-salicylidene-o-aminophenol (saphH2), N-salicylidene-o-aminocyclohexanol (sachH2) and N-salicylidene-2-amino-5-chlorobenzoic acid (sacbH2), in lanthanide (LnIII) cluster chemistry has afforded four families of polynuclear and dinuclear …
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Synthesis and reactivity studies of high-nuclearity carbido carbonyl clusters of heptarhenium-iridium and decaruthenium
The cluster anion ($\rm Re\sb7C(CO)\sb{21}Ir(C\sb8H\sb{14})(CO)\rbrack \sp{2-}$ has been synthesized by the capping of ($\rm Re\sb7C(CO)\sb{21}\rbrack \sp{3-}$ with the in-situ generated cationic species from the reaction of ($\rm Ir(C\sb8H\sb{14})\sb2(CO)Cl\rbrack \sb2$ and AgBF$\sb4.$ This new …
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Structure sensitivity of H2/D2 Isotopic Exchange on Pt/Al2O3 catalysts
… shown that activity and selectivity vary with Pt nuclearity for the acetylene semihydrogenation reaction, increasing in activity and decreasing in selectivity while increasing the particle size from single atoms (SA) to sub-nanoclusters to nanoparticles (NP), attributing the cause of these …
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Structure Sensitivity of Alkanes Hydrogenolysis and Alkynes Hydrogenation on Supported Ir Catalysts
… the metal on the surface. The variation of metal nuclearity and metal-support interactions are effective ways to change the geometric and electronic properties of the supported metal catalyst, leading to different types of the active sites exposing on the support that would take effect on …
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Structural studies of polynuclear metal carbonyl derivatives
… of fifteen metal carbonyl cluster compounds of nuclearity three to seven have been carried out to investigate the effect organo-fragments have on metal core geometry.
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Studies of the role of ligands in determining the structures of polynuclear metal compounds
… analyses of sixteen metal cluster compounds of nuclearity 3 to 11 have been carried out to investigate to what extent the attached surface ligands govern the structure in the solid state and how this relates to the chemistry of the cluster in solution.
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Coinage Metal Chalcogenide Clusters with N-Heterocyclic Carbene Ancillary Ligands
… ancillary NHC ligand, cluster geometry and nuclearity, and local environment. Lower energy photoluminescence is associated with higher atomic number chalcogenide ligands and correlates with the M→S metal-to-ligand charge transfer energy, for which M = Ag > Cu > Au. Quantum yield of emission …
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Structure Sensitivity in the Subnanometer Regime on Pt and Pd Supported Catalysts
… However, the relationship between metal nuclearity, electronic and their unique catalytic properties are still unclear. Thus, it is crucial to establish their relations for better future catalyst design. Ethylene hydrogenation and acetylene hydrogenation are two important probe reactions …
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Effect of Pt Particle Size and Electronic Properties on the Hydrogenation of Ethylene
… study first investigates the variation in Pt nuclearity on reducible CeO2 and its effect on the electronic properties of the metal, as well as the catalytic activity for ethylene hydro- genation. Moreover, this study also investigates the catalytic activity for Pt particles of the same size …
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Use of Oximes and Schiff-bases as Bridging/Chelating Ligands with Select 3d and 3d/4f Ions in Cluster Chemistry and a Mechanistic Insight into the Roles of Transition Metal Ions in the Formation of Tetrazoles
… magneto-structural correlation as the topology, nuclearity, and metal oxidation state descriptions remained the same among this family of clusters. Magnetic studies show that 2 exhibits a larger-spin relative to 1, and 3 demonstrates SMM behaviour. In Chapter 3, the mono- and dioxime ligands, …
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Coordination chemistry of cis,trans-1,3,5-Triaminocyclohexane : from mononuclear complexes to supramolecular architectures
… species, which can aggregate into higher nuclearity clusters. Protonated Cu(NO\(_3\))\(_2\) and CuBr\(_2\) complexes (HNO\(_3\) and HBr, respectively) remain mononuclear. CuCl\(_2\) and CuBr\(_2\) complexes protonated with HCl, however, form trinuclear species comprising trigonal planar …
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Tensor Products and Factorizations of Operator Systems
… denoted by γsoh. We prove various tensorial and nuclearity properties of γsoh, which distinguish γsoh from other known tensor products found in [8, 17, 18]. Then we extend such construction to the infinite-dimensional case and conclude that γsoh indeed defines a new tensor product of operator …
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