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Showing 1 to 20 of 557 for “"bulky"”.
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Structural Analysis Of Bulky Thiolate-Protected Gold Nanomolecules
… ratio is achieved. With the application of bulky ligands, most notably tert-butanethiol and 1-adamantanethiol, the underlying geometry is altered such that face-centered cuboidal (fcc), octahedron-based structures are favored. These structures are defined by atomic compositions, predicted by …
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Early Transition Metal Complexes Stabilized by Bulky Aminopyridinato Ligands
… Slight changes in the steric demand of the bulky ligand periphery can be used to tune the nature of the formed polymers by maintaining the selectivity issue. The Zr alkyl cations of the sterically more demanding version of the ligands are able to polymerize ethylene in a living fashion at 50 …
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Bulky cyclopentadienyl chromium complexes as ethene trimerisation catalyst precursors
… process of catalytic ethene trimerisation, using bulky cyclopentad ienyl chromium complexes was investigated. Firstly, a series of known and novel bulky cyclopentadiene ligands, of the type, C₅Ph₄RH (R = H, alkyl, aromatic or substituted aromatic group) were synthesised. Four routes were …
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Bulky Thiolated Gold Nanomolecules: Synthesis, Characterization, Optical Properties, and Atomic Structure
… it. Ligand type, such as aliphatic, aromatic or bulky play a crucial role in determining the size and composition of such NMs. A NM’s composition and properties vary widely depending on the type of ligand employed, and bulky thiolated NMs need to be explored in-depth. Hence, there is a need to …
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Ligand Effect on Gold Nanomolecules Demonstrated Using Aliphatic, Aromatic and Bulky Thiolate Ligands
… classes, namely; <em>aliphatic, aromatic and bulky</em> thiolate ligands. These distinct classes of thiolate ligands exclusively form a unique series of AuNMs and unique size-dependent properties. <em>Thiolate monolayer protecting the gold core of AuNMs have been shown to greatly influence the …
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Synthesis of Bulky and Polar Galactonoamidines for the Inhibition of the Human α-Galactosidase
… an effort towards the synthesis of polar and bulky galactonoamidines for the inhibition of the human α-galactosidase. Following a protocol previously established in the group, the precursor galactothionolactam was synthesized and coupled with several amines to yield a library of perbenzylated …
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Low-valent and low-coordinate titanium and molybdenum complexes supported with bulky amido ligands
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1997.
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Synthesis and characterization of iron complexes supported by bulky amide ligands : reduction and oxidation chemistry
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1998.
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Stereoselective Heterocycle Synthesis via Alkene Difunctionalization: Bulky Phosphine Ligands Enable Pd-Catalyzed Arylhalogenation, Arylcyanation and Diarylation
Due to the ubiquity of heterocyclic scaffolds in naturally occurring compounds and pharmaceutical drugs, an important longterm goal in organic chemistry has been developing new heterocycle syntheses. Research in the Lautens group has led to many advances in this field, specifically using Rh and Pd …
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The synthesis and properties of liquid crystals with bulky terminal groups for bookshelf geometry ferroelectric mixtures
… range of ortho difluoroterphenyls with a bulky terminal chain are detailed. The bulky terminal chain consists of either a tertiarybutyl group or a trimethylsilyl unit, each separated from the core by a short (dimethylene) chain, with the other terminal chain being either octyloxy or …
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Investigating the molecular origin of polymorphism and transition pathways in organic semiconductors with bulky side chains
… of polymorphism in organic semiconductors with bulky side chains by studying their phase transition pathways. We discover a unique cooperative transition with distinct advantages for application in organic electronics, and establish a general molecular design rule to trigger it. We access both …
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The gas chromatographic separation properties of azulene and the synthesis and characterization of bulky bis-pyrazolylpyridine metal-ligand complexes.
… are the synthesis and characterization of bulky tridentate ligand-metal complexes. Azulene is an aromatic molecule with interesting properties, most notably a permanent dipole moment of 1.08 D. This degree of polarity in the absence of heteroatoms is quite rare and offers potential for use …
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Ion Transport, Viscoelastic, and Thermal Properties of Several Poly(Ethylene Glycol) and Poly(Propylene Glycol) Based Polymer Electrolytes
… been investigated namely copolymerization with "bulky groups" and cross polymerization of MePEG and MePPG monomers. The modifications were made to vary the fractional free volume of the MePEG polymers. All of the copolymers obeyed the Doolittle equation. For both the bulky copolymers and …
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A Nascent Peptide Code for Translational Control of mRNA Stability in Human Cells
… individual amino acids, specific combinations of bulky and positively charged amino acids are critical for the destabilizing effects of dipeptide repeats. Remarkably, dipeptide sequences that form extended β strands in silico and in vitro slowdown ribosomes and reduce mRNA levels in vivo. The …
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Development of Multi-modal and Super-resolved Retinal Imaging Systems
… due to the following factors: the use of bulky tabletop systems, monochromatic imaging, and resolution degradation due to ocular aberrations and diffraction. </p><p>Bulky tabletop SLO and OCT systems are incapable of imaging patients that are supine, under anesthesia, or otherwise unable …
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The synthesis of kinetically stabilised heavy group 13 hydride complexes
… also describes the syntheses of a new super bulky 1,3 bis(2,6 terphenyl)triazene and two C 2,6-terphenyl substituted amidines. Chapter Three introduces the alkali metal chemistry of monoanionic bidentate N,Nʹ ligands. Alkali metal complexes of the aforementioned super bulky ligands (Chapter …
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An investigation into a flux-pumped high-temperature superconducting MRI system
… magnets. The losses associated with these bulky leads are unavoidable; as a result, these current leads are relatively less efficient. A flux pump is an alternative to conventional power sources and bulky copper leads. Flux pumping is an electrically contactless method to energize …
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Designing conjugated polymer-based functional materials via the incorporation of supramolecular complexities
… detection of small molecules. In addition, these bulky scaffolds prevent polymer aggregation. We turn our focus to the rotaxane monomers in Chapter Three. We investigate the photoinduced charge transfer interactions between donor and acceptor pairs within the rotaxane scaffold and examine the …
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Effect of Leaving Ligands of Platinum(II) Diamine Complexes on DNA and Protein Residues
… Previous research showed that both a non-bulky complex such as [Pt(en)(D<sub>2</sub>O)<sub>2</sub>]<sup>2+</sup> [en=ethylenediamine], and a bulky complex such as [Pt(Me<sub>4</sub>en)(D<sub>2</sub>O)<sub>2</sub>]<sup>2+</sup> [Me<sub>4</sub>en= N, N, N', N'-tetramethylethylenediamine] …
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