A5021837706- Luminescence and Fluorescent Materials
- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Organic Light-Emitting Diodes Research
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Photochemistry and Electron Transfer Studies
- Academic Writing and Publishing
- Molecular Junctions and Nanostructures
- Porphyrin and Phthalocyanine Chemistry
- Analytical Chemistry and Sensors
- Antimicrobial agents and applications
- Polydiacetylene-based materials and applications
- Molecular Sensors and Ion Detection
- Perovskite Materials and Applications
- Nonlinear Optical Materials Studies
- Photochromic and Fluorescence Chemistry
- TiO2 Photocatalysis and Solar Cells
- Radical Photochemical Reactions
- Quantum Dots Synthesis And Properties
- Advanced Photocatalysis Techniques
- Advanced biosensing and bioanalysis techniques
- CO2 Reduction Techniques and Catalysts
- Polymer Surface Interaction Studies
- Metal complexes synthesis and properties
The University of Texas at San Antonio
2016-2025
University of Florida
2010-2020
University of North Carolina System
2020
Shanghai Normal University
2016-2019
Culture Resource
2018
Gainesville Obstetrics & Gynecology
2014-2018
Circle (United States)
2017
University of New Mexico
2007-2011
Montana State University
2010
Bowling Green State University
2010
This is the report of a DOE-sponsored workshop organized to discuss status our understanding charge-transfer processes on nanoscale and identify research other needs for progress in nanoscience nanotechnology. The current basic electron-transfer research, both theoretical experimental, addressed, with emphasis distance-dependent measurements, we have attempted integrate terminology notation solution kinetics that conductance analysis. interface between molecules or nanoparticles bulk metals...
Abstract Organic-inorganic hybrid metal halide perovskites, an emerging class of solution processable photoactive materials, welcome a new member with one-dimensional structure. Herein we report the synthesis, crystal structure and photophysical properties organic lead bromide C 4 N 2 H 14 PbBr , in which edge sharing octahedral chains [PbBr 2− ] ∞ are surrounded by cations 2+ to form bulk assembly core-shell quantum wires. This unique enables strong confinement formation self-trapped...
A microporous three-dimensional (3D) hydrogen-bonded organic framework (HOF-20) has been constructed from an aromatic-rich tetratopic carboxylic acid, 5-(2,6-bis(4-carboxyphenyl)pyridin-4-yl)isophthalic acid (H4BCPIA). The activated HOF-20a a moderately high Brunauer–Emmett–Teller (BET) surface area of 1323 m2 g–1 and excellent stability in water HCl aqueous solution. HOF-20 exhibits highly efficient turn-up fluorescent sensing aniline with detection limit 2.24 μM is selective toward the...
A family of π-extended platinum(II) porphyrins has been synthesized and incorporated into solution processed polymer light emitting diodes (PLEDs) vapor deposited multilayer organic (OLEDs), giving rise to devices with peak emission ranging from 771 1005 nm. The longest wavelength emitter, platinum(II)-5,10,15,20-(3,5-di-tert-butylphenyl)tetraanthroporphyrin (Pt-Ar4TAP), shows an maximum at nm, external quantum efficiency (EQE) 0.12%, a radiant emittance (Rmax) 0.23 mW/cm2 in single layer...
Surface plasmon assisted catalysis (SPAC) reactions of 4-aminothiophenol (4ATP) to and back from 4,4′-dimercaptoazobenzene (DMAB) have been investigated by single particle surface enhanced Raman spectroscopy, using a self-designed gas flow cell control the reductive/oxidative environment over reactions. Conversion 4ATP into DMAB is induced energy transfer (plasmonic heating) resonance 4ATP, where O2 (as an electron acceptor) essential H2O base) can accelerate reaction. In contrast, hot (from...
Boronic acids are centrally important functional motifs and synthetic precursors. Visible light-induced borylation may provide access to structurally diverse boronates, but a broadly efficient photocatalytic method that can effect of wide range substrates, including strong C–O bonds, remains elusive. Herein, we report general, metal-free visible platform enables electron-rich derivatives phenols anilines, chloroarenes, as well other haloarenes. The reaction exhibits excellent group...
The ability of the doublet excited state perylene diimide anion radical 2(PDI-•)* to reduce aromatic electron acceptors was probed by picosecond time-resolved transient absorption (TA) spectroscopy. Excitation PDI-• produces visible TA due that decays with τ = 160 ps. Aromatic varying reduction potential quench and, in some cases, give a new region is attributed products bimolecular photoinduced transfer, + Ar-X → PDI Ar-X-•. Stern-Volmer quenching accomplished series provides rate constants...
A comprehensive photophysical investigation has been carried out on a series of eight complexes the type (diimine)Pt(-C=C-Ar)(2), where diimine is 2,2'-bipyridine (bpy) ligands and -C=C-Ar substituted aryl acetylide ligands. In one complexes, energy Pt --> bpy metal-to-ligand charge transfer (MLCT) excited state varied by changing substituents 4,4'- and/or 5,5'-positions ligand. second electronic demand ligand para substituent (X) ring (X = -CF(3), -CH(3), -OCH(3), -N(CH(3))(2)). The effect...
Fluorescent conjugated polyelectrolytes with pendant ionic sulfonate and carboxylate groups are used to sense protease activity. Inclusion of the fluorescent polyelectrolyte into assay scheme leads amplification sensory response. The sensing mechanism relies on an electrostatic interaction between a peptide substrate that is labeled fluorescence quencher. Enzyme activity hydrolysis kinetics measured in real time by using spectroscopy. Two approaches presented. In first approach, turn-on...
The fluorescence, absorption and fluorescence quenching properties of an anionic poly(phenylene ethynylene) are investigated in H2O MeOH solutions.
The conjugated polyelectrolyte PPESO3 features a poly(phenylene ethynylene) backbone substituted with anionic 3-sulfonatopropyloxy groups. is quenched very efficiently (KSV > 106 M-1) by cationic energy transfer quenchers in an amplified quenching process. In the present investigation, steady-state and picosecond time-resolved fluorescence spectroscopy are used to examine of series cyanine dyes via singlet−singlet transfer. goal this work understand mechanism characterize important...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnusual Photophysics of a Rhenium(I) Dipyridophenazine Complex in Homogeneous Solution and Bound to DNAHeather D. Stoeffler, Nancy B. Thornton, Stacy L. Temkin, Kirk S. SchanzeCite this: J. Am. Chem. Soc. 1995, 117, 27, 7119–7128Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue 1 July 1995https://pubs.acs.org/doi/10.1021/ja00132a012https://doi.org/10.1021/ja00132a012research-articleACS...
A family of multi-heterocycle donor–acceptor–donor (DAD) telechelic conjugated oligomers designed for two-photon absorption (2PA) and emission in the near-infrared (near-IR) were prepared, relationship between their spectral, structural, electrochemical properties investigated. These oligomers, based on electron-rich thiophene, phenylene, 3,4-ethylenedioxythiophene (EDOT) units as donors along with electron-deficient benzothiadiazole or its derivative acceptors, have been characterized...
Relatively efficient photovoltaic devices were fabricated using blends of a phosphorescent platinum–acetylide polymer and fullerene (PCBM); involvement the triplet excited state in photoinduced charge transfer is believed to contribute device efficiency.
The fluorescence of the anionic, carboxylate-substituted poly(phenylene ethynylene) polymer PPECO2 is quenched very efficiently via addition 1 equiv Cu2+. Addition pyrophosphate (PPi) into weakly fluorescent solution and Cu2+ induces recovery polymer's fluorescence; occurs because PPi complexes with Cu2+, effectively sequestering ion so it cannot bind to carboxylate groups polymer. A calibration curve was developed that relates extent [PPi], making PPECO2−Cu2+ system a sensitive selective...
A series of 4'-tolylterpyridyl platinum(II) complexes with different arylacetylide ligands, namely, phenylacetylide, 4-bromophenylacetylide, 4-nitrophenylacetylide, 4-methoxyphenylacetylide, 4-dimethylaminophenylacetylide, 1-naphthylacetylide, and 3-quinolinylacetylide, were synthesized. Their photophysical properties, such as electronic absorption spectra, emission characteristics at room temperature 77 K, transient difference have been investigated. All these exhibit a metal-to-ligand...
We describe the layer-by-layer (LBL) fabrication of multilayer films and photovoltaic cells using poly(phenylene ethynylene)-based anionic conjugated polyelectrolytes as electron donors water-soluble cationic fullerene C60 derivatives acceptors. LBL film deposition was found to be linearly related number bilayers monitored by UV-vis absorption. Atomic force microscopy (AFM) scanning (SEM) revealed an aggregated but relatively uniform morphology devoid any long-range phase separation. The...
A series of poly(arylene ethynylene) (PAE) conjugated polyelectrolytes (CPEs) have been prepared using palladium-mediated (Sonogashira) coupling chemistry. The consists five pairs polymers that share the same backbone. One member each pair contains anionic sulfonate (R−SO3-) side groups, whereas other cationic bis-alkylammonium (R-N+−R-N+−R) groups. repeat unit structure backbone a bis(alkoxy)phenylene-1,4-ethynylene alternating with second arylene ethynylene moiety, and different arylenes...
To explore the photophysics of platinum acetylide chromophores with strong two-photon absorption cross-sections, we have investigated synthesis and spectroscopic characterization a series complexes that feature highly π-conjugated ligands substituted π-donor or -acceptor moieties. The molecules (numbered 1−4) considered in present work are analogs bis(phenylethynyl)bis(tributylphosphine)platinum(II) complexes. Molecule 1 carries two alkynyl-benzothiazolylfluorene ligands, molecule 2 has...