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1. Counter Anion Effect on the Photophysical Properties of Emissive Indolizine-Cyanine Dyes in Solution and Solid State

Author

Jacqueline N. Gayton, Shane Autry, Ryan C. Fortenberry, Nathan I. Hammer, and Jared H. Delcamp

Subjects
NIR emissive materials, stokes shift, indolizine cyanine, solid-state emission, optical materials, Organic chemistry, QD241-441
Abstract

Near-infrared emissive materials with tunable Stokes shifts and solid-state emissions are needed for several active research areas and applications. To aid in addressing this need, a series of indolizine-cyanine compounds varying only the anions based on size, dipole, and hydrophilicity were prepared. The effect of the non-covalently bound anions on the absorption and emission properties of identical π-system indolizine-cyanine compounds were measured in solution and as thin films. Interestingly, the anion choice has a significant influence on the Stokes shift and molar absorptivities of the dyes in solution. In the solid-state, the anion choice was found to have an effect on the formation of aggregate states with higher energy absorptions than the parent monomer compound. The dyes were found to be emissive in the NIR region, with emissions peaking at near 900 nm for specific solvent and anion selections.

Published
2018
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2. Counter Anion Effect on the Photophysical Properties of Emissive Indolizine-Cyanine Dyes in Solution and Solid State

Author

Ryan C. Fortenberry, Nathan I. Hammer, Jared H. Delcamp, Shane A. Autry, and Jacqueline N. Gayton

Subjects
Anions, stokes shift, Materials science, Astrophysics::High Energy Astrophysical Phenomena, Pharmaceutical Science, Astrophysics::Cosmology and Extragalactic Astrophysics, 010402 general chemistry, Photochemistry, 01 natural sciences, Article, Analytical Chemistry, Ion, lcsh:QD241-441, chemistry.chemical_compound, symbols.namesake, optical materials, lcsh:Organic chemistry, Stokes shift, Drug Discovery, Physical and Theoretical Chemistry, Cyanine, Thin film, Astrophysics::Galaxy Astrophysics, Fluorescent Dyes, solid-state emission, Spectroscopy, Near-Infrared, Molecular Structure, 010405 organic chemistry, Organic Chemistry, Indolizines, NIR emissive materials, indolizine cyanine, Carbocyanines, 0104 chemical sciences, Solvent, Monomer, chemistry, 13. Climate action, Chemistry (miscellaneous), symbols, Solvents, Molecular Medicine, Indolizine, Absorption (chemistry)
Abstract

Near-infrared emissive materials with tunable Stokes shifts and solid-state emissions are needed for several active research areas and applications. To aid in addressing this need, a series of indolizine-cyanine compounds varying only the anions based on size, dipole, and hydrophilicity were prepared. The effect of the non-covalently bound anions on the absorption and emission properties of identical &pi, system indolizine-cyanine compounds were measured in solution and as thin films. Interestingly, the anion choice has a significant influence on the Stokes shift and molar absorptivities of the dyes in solution. In the solid-state, the anion choice was found to have an effect on the formation of aggregate states with higher energy absorptions than the parent monomer compound. The dyes were found to be emissive in the NIR region, with emissions peaking at near 900 nm for specific solvent and anion selections.

Published
2018

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