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Showing 1 to 20 of 29 for “"phenylene ethynylene"”.
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Poly(phenylene ethynylene)s in biosensor applications
… thesis presents three new applications of poly(phenylene ethynylene)s (PPEs) in biosensing applications. Biotinylated PPEs were synthesized for the detection of dye-labeled streptavidin using energy transfer, in the aqueous phase and in the solid phase. These polymers served as a model for …
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New sensor applications of poly(phenylene ethynylene)s
(cont.) Fluorescence quenching by these analytes was shown to be assisted by specific host-guest interactions involving the calix[4]arene macrocycles.
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Grafted poly(phenylene-ethynylene) : optical and optoelectronic applications
Poly(phenylene-ethynylene) (PPE), a fully conjugated polymer system, exhibits high solution state quantum yields, narrow emission profiles, and wide band gaps allowing for blue emission, making them ideal candidates for display applications. Unfortunately, PPEs have received little attention in …
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Study of poly(phenylene ethynylene)s, dendritic quenchers, and molecular beacons towards the application of a poly(phenylene ethynylene)-based biosensor
Poly(para-phenylene ethynylene)s (PPE)s are highly emissive conjugated polymers that are easily quenched by target analytes. As a result, they have been increasingly incorporated into sensing platforms, both as chemosensors and as biosensors. This thesis describes the three components necessary for …
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Folding-Driven, Nucleation -Elongation Polymerization of Phenylene Ethynylene Imines
… polymeric product, the polymerization of oligo(m-phenylene ethynylene) imines in solution should inherently show nucleation-elongation in chain growth. The evidence for this behavior was obtained from polymerizations conducted under conditions of imbalanced stoichiometry. Since the polymerization …
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Solid Phase Synthesis of M-Phenylene Ethynylene Oligomer Heterosequences
The synthesis of m-phenylene ethynylene (mPE) oligomers is currently a tedious process. To address this, two methods for the solid-phase synthesis of mPE oligomers (including heterosequences) have been developed. The first strategy employs a silyl-acetylene linker attached to ArgoGel(TM) solid …
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Cationic Phenylene Ethynylene Polymers and Oligomers Induce Conformational Changes to Proteins
… of bacteria with a novel class of synthetic phenylene ethynylene (PPE)-based conjugated polyelectrolytes (CPEs) has helped in providing a new antimicrobial compound. Results proved successful and lead to experimentation to use the new class of compounds as an antiviral answer as well. The …
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Reactive Sieving With M-Phenylene Ethynylene Foldamers: Effects of Structural Modification on Reactivity
In an attempt to further understand the nature of the host-guest interaction between mPE foldamers and the methylsulfonate esters used to study reactive sieving, a set of parameters for both the mPE foldamer and the methylsulfonate guests were developed for CHARMM-based molecular dynamics …
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Helical Pitch, Hydrophobic Binding, Chiral Templation, and Supramolecular Chelation of M-Phenylene Ethynylene Foldamers
"Several different m-phenylene ethynylene (m PE) folding oligomers or foldamers were designed, synthesized, and studied. These chain molecules have been shown to adopt a helical conformation under appropriate conditions in solution. A series of double TEMPO spin labeled oligomers were studied by …
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Hexagonally-Packed Helical Oligo(m-Phenylene Ethynylene) Nanotubules via Structural Modification and Guest Templation
Various sequence-specific oligo(m-phenylene ethynylene) foldamers were designed, synthesized and studied. The foldamers were examined with the intention of translating previously reported solution-phase concepts into the solid-state realm. Specifically, the employment of the highly ordered helical …
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Folding-Promoted Reactivity and Tunable Structure of Pyridine-Containing M-Phenylene Ethynylene Helical Cavitands
In one study, a hydrogen bonding interaction between adjacent monomer units is shown to stabilize the folded conformation of a PE oligomer. Subsequent studies focus on the incorporation of pyridine rings into the chain sequence. The pKa value of the pyridine nitrogen can be modulated either by …
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Phenylene Ethynylene Foldamers: Cooperative Conformational Transition, Twist Sense Bias, Molecular Recognition Properties, and Solid -State Organization
… series of sequence-specific meta connected phenylene ethynylene oligomers were designed, synthesized, and studied. The oligomers were determined to adopt highly ordered conformations both in solution and the solid-state. The conformational transition from a random coil to helical …
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Modulation of the Aromatic-Aromatic Stacked Organizations of Phenylene Ethynylene Macrocycles and Oligomers Through Structure Modification
… has been observed that subtle modifications of phenylene ethynylene architectures can influence their aromatic-aromatic stacking propensities, and that the nature of these architectures can be modulated by the design of appropriate hetero-sequences.
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The Solid Phase Synthesis of M-Phenylene Ethynylene Oligomers and Its Application to the Synthesis of Covalent Molecular Ladders
… advent of a practical solid phase synthesis of m-phenylene ethynylene oligomers their use as building blocks for the synthesis of 2D grids was attempted. In order to assess the practicality of forming large 2D grids through the use of dynamic covalent chemistry we first targeted the self-assembly …
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I. Depolymerization-macrocyclization of (o-phenylene-ethynylene)-alt-(arylene-ethynylene) copolymers II. Improving existing water filtration membranes via covalent modification
I. Depolymerization-Macrocyclization of (o-Phenylene-Ethynylene)-alt-(Arylene-Ethynylene) Copolymers The synthesis of shape-persistent arylene-ethynylene macrocycles via alkyne metathesis remains an open area of investigation due to gaps in understanding about how monomer structure affects product …
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Advances in molecular scale electronics: Synthesis and testing of nanoscale wires and devices
… preparation. Chapter 3 discusses the use of phenylene ethynylene oligomers as self assembled monolayer negative tone resist for the manufacture of even smaller semiconductor chips. With current methods of silicon etching with polymer resists, devices with sub-25 run feature size are not …
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The Synthesis of Naphthalene-Containing Compounds and Materials Using Benzannulation Reactions
… Despite the high efficiency of this reaction, phenylene ethynylene macrocycles prove to be too rigid to undergo complete benzannulation (Chapter 3). Finally, the scope of this transformation was expanded beyond aryl substituted acetylenes with the benzannulation of silyl-haloacetylenes (Chapter …
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Investigating the properties of molecular wires on gold and diamond
… metal complexes to pyridine-terminated oligo(phenylene)ethynylene self-assembled monolayer formed well-ordered molecular assemblies using various surface characterization techniques. Electrical measurements revealed enhanced conductivity, rectification and negative differential resistance in …
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Part I: The synthesis of chenodeoxycholic acid derived macrocyles and cage compounds. Part II. Sonogashira coupling for the synthesis of well-defined π-conjugated arylene ethynylene oligomers as blue-light-emitting materials
… of well-defined π-conjugated arylene ethynylene oligomers. These oligomers have applications in the fabrication of potential organic photovoltaic cells and organic light-emitting diodes (OLEDs). Four series of arylene ethynylene oligomers: mono-terminated di-tert-butyl-substituted OPEs …
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Molecules and materials for the optical detection of explosives and toxic chemicals
… groups directly bound to the arene rings of poly(phenylene ethynylene)s and poly(fluorene)s. These materials displayed red-shifted absorption and emission spectra, large Stokes Shifts, as well as long excited state lifetimes.
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