Search Results - "Demas, J N"

Aromatic Difluoroboron β‑Diketonate Complexes: Effects of π‑Conjugation and Media on Optical Properties by Xu, Songpan, Evans, Ruffin E, Liu, Tiandong, Zhang, Guoqing, Demas, J. N, Trindle, Carl O, Fraser, Cassandra L

“…Aromatic difluoroboron β-diketonate complexes (BF2bdks) are classic fluorescent molecules that have been explored as photochemical reagents, two-photon dyes,…”
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Multi-Emissive Difluoroboron Dibenzoylmethane Polylactide Exhibiting Intense Fluorescence and Oxygen-Sensitive Room-Temperature Phosphorescence by Zhang, Guoqing, Chen, Jianbin, Payne, Sarah J, Kooi, Steven E, Demas, J. N, Fraser, Cassandra L

“…Boron difluoride compounds are light emitting materials with impressive optical properties. Though their strong one- and two-photon absorption and intense…”
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Luminescence Oxygen Sensor Based on a Ruthenium(II) Star Polymer Complex by Payne, Sarah J, Fiore, Gina L, Fraser, Cassandra L, Demas, J. N

“…A novel quenchometric oxygen sensor based on a low polydispersity (PDI) star polymer [Ru(bpyPS2)3](PF6)2 (bpy = 2,2′-bipyridine, PS = polystyrene) is reported…”
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Luminescent Transition Metal Complexes as Sensors:  Structural Effects on pH Response by Higgins, Bernadette, DeGraff, B. A, Demas, J. N

“…A series of luminescent transition metal complexes using the pH-sensitive ligand 5-carboxy-1,10-phenanthroline has been synthesized and characterized. The…”
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Luminescence Lifetime Standards for the Nanosecond to Microsecond Range and Oxygen Quenching of Ruthenium(II) Complexes by Morris, Kaleem J, Roach, Michael S, Xu, Wenying, Demas, J. N, DeGraff, B. A

“…A rapid and reproducible method for determining the temperature dependence of luminescence lifetimes has been developed. With the use of this method, a set of…”
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Modeling of Luminescence Quenching-Based Sensors: Comparison of Multisite and Nonlinear Gas Solubility Models by Demas, J. N, DeGraff, B. A, Xu, Wenying

“…Quenching-based luminescence sensors exhibit nonlinear Stern-Volmer quenching behavior. Two common explanations of the nonlinearity are either multisite…”
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Determining Proton Diffusion in Polymer Films by Lifetimes of Luminescent Complexes Measured in the Frequency Domain by Bowyer, Walter J, Xu, Wenying, Demas, J. N

“…Polymer-supported luminescent metal complexes represent an important class of oxygen, pH, and ion sensors. The diffusion properties of the analyte into the…”
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Optimized Gating Scheme for Rapid Lifetime Determinations of Single-Exponential Luminescence Lifetimes by Chan, Sing Po, Fuller, Z. J, Demas, J. N, DeGraff, B. A

“…The rapid lifetime method (RLD) for determining excited-state lifetimes uses the ratio of the areas under two regions of the decay. To get good precision with…”
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Error Analysis of the Rapid Lifetime Determination Method for Double-Exponential Decays and New Windowing Schemes by Sharman, Kristin K, Periasamy, Ammasi, Ashworth, Harry, Demas, J. N

“…The rapid lifetime determination method (RLD) is a mathematical technique for extremely rapid evaluations of lifetimes in exponential decays. It has been…”
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Oxygen sensors based on luminescence quenching by DEMAS, J. N, DEGRAFF, B. A, COLEMAN, P. B

“…As an optical detection strategy, luminescence offers many advantages such as excellent sensitivity and selectivity. James N. Demas of the University of…”
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Photostability of Luminescent Ruthenium(II) Complexes in Polymers and in Solution by Fuller, Z. J, Bare, W. D, Kneas, K. A, Xu, W.-Y, Demas, J. N, DeGraff, B. A

“…The effects of oxygen on the photochemical properties of ruthenium(II) complexes in solution and in polymers are reported. In solution, the complex is actually…”
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Comparison of Methods for Rapid Evaluation of Lifetimes of Exponential Decays by Moore, Christopher, Chan, Sing Po, Demas, J. N., DeGraff, B. A.

“…For evaluating exponential luminescence decays, there are a variety of computational rapid integral methods based on the areas of the decay under different…”
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Ruthenium(II) Tris(bipyridine)-Centered Poly(ethylenimine) for Gene Delivery by Fiore, Gina L, Edwards, James M, Payne, Sarah J, Klinkenberg, Jessica L, Gioeli, Daniel G, Demas, J. N, Fraser, Cassandra L

“…Ruthenium(II) tris(bipyridine)-centered poly(ethylenimine) (Ru PEI) was synthesized via acid hydrolysis of Ru tris(bipyridine)-centered…”
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Photophysics and photochemistry of oxygen sensors based on luminescent transition-metal complexes by Carraway, E. R, Demas, J. N, DeGraff, B. A, Bacon, J. R

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Ruthenium Tris(bipyridine) Complexes with Sulfur Substituents: Model Studies for PEG Coupling by Fiore, Gina L, Goguen, Brenda N, Klinkenberg, Jessica L, Payne, Sarah J, Demas, J. N, Fraser, Cassandra L

“…Ruthenium polypyridyl complexes are incorporated into polymers for sensing and light emitting materials applications. Coupling reactions between metal…”
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Emission Color Tuning with Polymer Molecular Weight for Difluoroboron Dibenzoylmethane-Polylactide by Zhang, Guoqing, Kooi, Steven E., Demas, J. N., Fraser, Cassandra L.

“…Difluoroboron dibenzoylmethane‐poly(lactic acid) emission is sensitive to the polarity of the surrounding medium. As the polymer molecular weight increases,…”
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Determining Oxygen Diffusion Coefficients in Polymer Films by Lifetimes of Luminescent Complexes Measured in the Frequency Domain by Bowyer, Walter J, Xu, Wenying, Demas, J. N

“…Polymer films doped with luminescent ruthenium complexes are proving to be important oxygen sensors. We describe a technique using lifetime measurements in the…”
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Oxygen Sensors Based on Luminescence Quenching: Interactions of Metal Complexes with the Polymer Supports by Xu, Wenying, McDonough, Robert Clayton, Langsdorf, Brandi, Demas, J. N, DeGraff, B. A

“…Oxygen quenching of [Ru(Ph2phen)3]Cl2 (Ph2phen = 4,7-diphenyl-1,10-phenanthroline) has been studied in a diverse series of polymers, most with a common…”
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Lifetime-Based pH Sensor System Based on a Polymer-Supported Ruthenium(II) Complex by Clarke, Yvette, Xu, Wenying, Demas, J. N, DeGraff, B. A

“…A new luminescence lifetime-based pH sensor system is described. The system is based on [Ru(Ph2phen)2DCbpy]2+ (DCbpy = 4,4‘-dicarboxy-2,2‘-bipyridine)…”
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Oxygen Sensors Based on Luminescence Quenching of Metal Complexes:  Osmium Complexes Suitable for Laser Diode Excitation by Xu, Wenying, Kneas, Kristi A., Demas, J. N., DeGraff, B. A.

“…Oxygen quenching of a series of Os(II) complexes with α-diimine ligands has been studied in a predominantly poly(dimethylsiloxane) (PDMS) polymer and in Gp-163…”
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