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 34 for “"Cyanine"”.
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Electron transfer in cyanine borate ion pairs
… chosen for our electron transfer studies are cyanine dye acceptors and tetraarylborate donors (see below for representative examples). The two ions are dissolved in a nonpolar solvent to assure a contact ion pair structure. The cyanine is then irradiated, and this induces the electron transfer …
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Structural Studies of Penetrated Ion Pairs Using Chiral Cyanine Borates
… p\prime,3\sp\prime$-hexamethyl-9-phenyl-indo-carbocyanine, 1,1$\sp\prime$-diethyl-2,2$\sp\prime$-cyanine, 1,1$\sp\prime$-di-(3,5-di-tert-butyl)benzyl-2,2$\sp\prime$-cyanine, or 1,1$\sp\prime$-di-(4-tert-butyl)benzyl-2,2$\sp\prime$-cyanine when penetrated into a chiral cavity of either spirobi- …
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Photostabilization of J-aggregate cyanine dyes for exciton-polariton based devices
… Using J-aggregates, the aggregated form of cyanine organic dyes, we have previously fabricated light-emitting devices that demonstrated the first ever electrically pumped polariton emission, as well as critically coupled resonators with record high effective absorption constants. Although …
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Exploring the Influence of structural variation on the solution and solid-state behaviour of cyanine
Cyanine dyes are well known and extensively studied molecules. The preparations and investigations of a wide range of dyes have been previously reported. Here several novel and known compounds have been synthesised to investigate the effect molecular structure has on their bulk-solution and …
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Reactions of Excited State Cationic Dyes
… In the third chapter, intersystem crossing in a cyanine dye, induced by heavy atom counterions and heavy atom containing solvent is discussed. The first description and transient spectroscopy of an intra-ion pair heavy atom effect is given there. The electron transfer reactions of cationic …
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Exploring Structure Function Relationship using Bio-Inspired DNA-Chromophore Complexes
… We adopt a DNA-based framework to scaffold cyanine chromophores in order to construct modularizable photonic circuit components. This framework allows nanoscale precision over the control of excitons and their dynamics, which is a prerequisite for the implementation of large scale molecular …
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Sensitive microarray-based biomarker detection using photonic crystal enhanced fluorescence and label-free imaging
… in a two-color DNA microarray using Cyanine-5 (Cy5) and Cyanine-3 (Cy3). Observed enhancements in spot signal intensity and spot signal-to-noise ratio resulted in a 2x increase in the number of genes that were detected on the PC relative to standard glass microscope slides for each …
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Photoluminescent energy transfer from poly(phenyleneethylene)s to a series of dyes
… were used as the energy donor, and xanthene, cyanine, phenoxazine, and squaraine dyes were utilized as energy acceptors. Energy transfer efficiency was investigated by exciting the polymer and monitoring the quenching of polymer emission, along with the enhanced dye emission. Squaraine dyes …
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Nanocrystal/J-aggregate constructs : chemistry, energy transfer, and applications
… semiconductor nanocrystals and J-aggregates of cyanine dyes, have been developed chiefly due to their potential for interacting with light in interesting and productive ways. At the same time, existing spectroscopy and microscopy tools enable the study of these photonic materials, their …
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A thermally stabilized fluorescent organic chromophore
… fluorescent chromophore, hereby designated as cyanine dye, has been bound to generated zinc oxide nanoparticles. It has been shown that the material not only retains the characteristic absorption peak of the native chromophore, but it also continues to fluoresce with comparable intensity. The …
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Mechanistic, Biochemical, and Theoretical Studies of Phototoxicity and Photobluing
… photoconversion of heptamethine to pentamethine cyanines and of pentamethine to trimethine cyanines. Here, we report mechanistic studies and initial experimental evidence for a previously unexplored 4-carbon truncation reaction that converts the simplest heptamethine cyanine to the corresponding …
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Solid state cavity QED : practical applications of strong coupling of light and matter
J-aggregates of cyanine dyes are the excitonic materials of choice for realizing polariton devices that operate in strong coupling at room temperature. Since the earliest days of cavity QED, there has been a major desire to construct solid state optical devices that operate in the limit where …
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Optical studies of colloidal quantum dots : optical trapping with plasmonic nanoapertures and thermal recovery from photoinduced dimming
… film, is also discussed. Lastly, self-assembled cyanine-dye nanotubes were monitored during flash dilution with absorption spectroscopy at a high frame rate to separate spectroscopic contributions of the outer layer in double walled and bundled nanotubes.
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Superradiant Emission from Delocalized Frenkel Excitons in Molecular J-Aggregates
… J-aggregates. I first select a J-aggregating cyanine chromophore and reduce its nonradiative pathways by rigidifying its backbone. The resulting conformationally restrained cyanine dye self-assembles in water-methanol mixtures to form highly emissive J-aggregates with micron-scale …
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Engineering Fluorescently Labeled Human Fibroblast Growth Factor One Mutants and Characterizing Their Photophysics Properties Towards Designing FRET Assays
… the maleimide moiety of the dyes (Alexa Fluor, Cyanine and iFluor) to conjugate to the cysteine residues via a thioether bond. We synthesized biologically active, and site specifically fluorescently labeled hFGF1 mutants of F2C-hFGF1 (on the flexible N terminal loop) and T79C-hFGF1 (on the rigid …
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Design and synthesis of conjugated macrocycles and polymers
… relative to the classic J-aggregating cyanine dyes. A variation on the dibenzanthracene theme was extended to the work described in Chapter 4, which features poly(aryleneethynylene)s containing dibenz[a,h]anthracene repeat units. These polymers have unusual stair-stepped structures that …
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The Synthesis and Evaluation of Non-Targeted Near-Infrared Heptamethine Molecular Probes
… compared against the clinical standard Indocyanine Green (ICG) and its structural derivative New Indocyanine Green (IR-820). The ultimate aim being to identify dyes which can be used alongside the clinical standards. The compounds developed within this thesis are structurally based on the …
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Exciton Dynamics in DNA-Chromophore Assemblies
… we detect a previously unknown dark state in a cyanine fluorophore and identify the associated structural mode coupling likely responsible for its formation. We then incorporate this fluorophore into a DNA double crossover tile for easy photophysical tunability by creating a strongly coupled …
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Effects of Metallic Nanoalloys on Dye Fluorescence
… to double or triple the emission intensity of cyanine dyes which are commonly used in (deoxyribonucleic acid) DNA microarrays. The emission intensity of indocyanine green — widely used as a contrast agent in medical imaging — was about twenty times higher in the proximity of SIFs. This …
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