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Your search keyword '"Vonder Haar, Amy L."' showing total 10 results
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10 results on '"Vonder Haar, Amy L."'

1. Behavior of astatine and bismuth in non-conventional solvents: Extraction into imidazolium-based ionic liquid and methyl anthranilate with active pharmaceuticals binary mixtures from nitric acid media

Author

Tereshatov, Evgeny E., Burns, Jonathan D., Vonder Haar, Amy L., Schultz, Steven J., McIntosh, Lauren A., Tabacaru, Gabriel C., McCann, Laura A., Avila, Geoffrey, Hannaman, Andrew, Hood, Ashley, Lofton, Kylie N., McCarthy, Mallory A., Sorensen, Maxwell, and Yennello, Sherry J.

Published
2023
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3. Rapid recovery of At-211 by extraction chromatography

Author

Burns, Jonathan D., Tereshatov, Evgeny E., Avila, Geoffrey, Glennon, Kevin J., Hannaman, Andrew, Lofton, Kylie N., McCann, Laura A., McCarthy, Mallory A., McIntosh, Lauren A., Schultz, Steven J., Tabacaru, Gabriel C., Vonder Haar, Amy L., and Yennello, Sherry J.

Published
2021
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7. Complexation of Astatine(III) with Ketones: Roles of NO3–Counterion and Exploration of Possible Binding Modes

Author

Burns, Jonathan D., primary, Tereshatov, Evgeny E., additional, Zhang, Bowen, additional, Tabacaru, Gabriel C., additional, McIntosh, Lauren A., additional, Schultz, Steven J., additional, McCann, Laura A., additional, Harvey, Bryan M., additional, Hannaman, Andrew, additional, Lofton, Kylie N., additional, Sorensen, Maxwell Q., additional, Vonder Haar, Amy L., additional, Hall, Michael B., additional, and Yennello, Sherry J., additional

Published
2022
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9. Solvent-tunable exciton-charge transfer mixed state enhances emission of functionalized benzo[ rst ]pentaphene through symmetry breaking.

Author

Xu X, Vonder Haar AL, Yoshioka R, Zhang Q, Vasylevskyi S, Musser AJ, and Narita A

Subjects
Solvents chemistry, Magnetic Resonance Spectroscopy, Nitrous Oxide
Abstract

A benzo[ rst ]pentaphene (BPP) substituted by two bis(methoxyphenyl)amino (MeOPA) groups (BPP-MeOPA) was synthesized and clearly characterized by NMR and single-crystal X-ray analysis. Detailed investigations of its photophysical properties, including transient absorption spectroscopy analyses, revealed that the introduction of the MeOPA groups breaks the symmetry of the BPP core, improving its absorption and emission from an S 1 state with both excitonic and charge-transfer character.

Published
2023
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10. Complexation of Astatine(III) with Ketones: Roles of NO 3 - Counterion and Exploration of Possible Binding Modes.

Author

Burns JD, Tereshatov EE, Zhang B, Tabacaru GC, McIntosh LA, Schultz SJ, McCann LA, Harvey BM, Hannaman A, Lofton KN, Sorensen MQ, Vonder Haar AL, Hall MB, and Yennello SJ

Subjects
Cations, Solvents, Water, Astatine, Ketones
Abstract

Ketones have been proven effective in extracting astatine(III) from aqueous solvents. Previous theoretical studies suggested a mechanism where the "sp 2 " lone pair on the carbonyl oxygen donates electron density into the π system of the AtO + molecular cation to form a dative-type bond. In this study, co-extraction of NO 3 - as AtO(NO 3 )·(O═CR 1 R 2 ) species into the organic phase appears to be a key factor. Adjusting the electronic properties of the ketone, by having an aryl group instead of an alkyl group in the alpha position of the ketone, increased the electron density on C═O, increased the bond strength between the ketone and AtO + , and in turn increased the extraction of 211 At into the organic phase. Extraction with diketones shows dependence on the bridging distance between the two carbonyl moieties, where a C 3 or longer bridge results in a 10-fold increase in extraction into the organic phase. DFT calculations show the longer bridge allows for the chelation of AtO(NO 3 ) by either the second carbonyl or the phenyl ring.

Published
2022
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