Long-lived Luminescent Metal Complexes for Molecules Sensing and Nanotube Dispersion

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dc.contributor.advisorMarti, Angel A.en_US
dc.contributor.committeeMemberWilson, Lon Jen_US
dc.contributor.committeeMemberDiehl, Michaelen_US
dc.creatorHuang, Keweien_US
dc.date.accessioned2016-01-11T20:24:43Zen_US
dc.date.available2016-01-11T20:24:43Zen_US
dc.date.created2014-12en_US
dc.date.issued2014-09-19en_US
dc.date.submittedDecember 2014en_US
dc.date.updated2016-01-11T20:24:43Zen_US
dc.description.abstractPhosphorescent heavy-metal complexes are one class of excellent photoluminescent materials. The heavy metal-induced spin–orbit coupling leads to singlet–triplet state mixing, thus decreases the “spin-forbidden” component of the radiative relaxation of the triplet state, and consequently improves the phosphorescence quantum efficiency and radiative emission lifetime. Moreover, the emission wavelength of metal complexes can be easily tuned through the ligand modification and the change of central metals. Ruthenium(II) and Iridium(III)-based complexes have d6 electronic structures. The advantageous photophysical properties including long lifetime, large Stokes shift and long wavelength excitation provide them to be good candidates for chemosensors. This thesis focuses on the development of novel iridium and ruthenium complexes for small molecules sensing. Their long-lived photoluminescence lifetime allows detecting analytes even in the presence of short-lived background fluorescence by using time-gating techniques. An overview of the developing trends in molecular beacon design and applications will be introduced in Chapter 1. In Chapter 2, the long-lived emission of Ir(III) and Ru(II) complexes are combined with time-resolved spectroscopic techniques for optimizing the sensitivity of molecular beacons. A novel iridium complex with long-lived photoluminescence will be discussed in Chapter 3, which can be used for the detection of thiol-containing amino acids in the presence of strong background fluorescence. In Chapter 4, pre-exponential factors derived from time-resolved experiments will be applied for quantifying free histidine in mixtures with histidine-containing proteins. The last Chapter is the development of the new application of Ruthenium complexes as a media for dispersion nanotubes in aqueous solution.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationHuang, Kewei. "Long-lived Luminescent Metal Complexes for Molecules Sensing and Nanotube Dispersion." (2014) Diss., Rice University. <a href="https://hdl.handle.net/1911/87811">https://hdl.handle.net/1911/87811</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/87811en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectIridiumen_US
dc.subjectRutheniumen_US
dc.subjectMolecular Beaconen_US
dc.subjectCysteineen_US
dc.subjectHistidineen_US
dc.subjectNanotubeen_US
dc.subjectDispersionen_US
dc.titleLong-lived Luminescent Metal Complexes for Molecules Sensing and Nanotube Dispersionen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentChemistryen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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