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Your search keyword '"Swager, Timothy M."' showing total 42 results
Start Over Author "Swager, Timothy M." Journal angewandte chemie
42 results on '"Swager, Timothy M."'

13. Nanodrähte in Chemo- und Biosensoren: aktueller Stand und Fahrplan für die Zukunft.

Author

Fennell, John F., Liu, Sophie F., Azzarelli, Joseph M., Weis, Jonathan G., Rochat, Sébastien, Mirica, Katherine A., Ravnsbæk, Jens B., and Swager, Timothy M.

Abstract

Copyright of Angewandte Chemie is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2016
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14. Simultaneous Identification of Neutral and Anionic Species in Complex Mixtures without Separation.

Author

Zhao, Yanchuan, Chen, Lily, and Swager, Timothy M.

Subjects
ANIONS, MIXTURES, BIOGENIC amines, FLUORINE, NUCLEAR magnetic resonance spectroscopy
Abstract

A chemosensory system is reported that operates without the need for separation techniques and is capable of identifying anions and structurally similar bioactive molecules. In this strategy, the coordination of analytes to a metal complex with an open binding cleft generates "static structures" on the NMR timescale. Unique signals are created by strategically placing fluorine atoms in close proximity to bound analytes so that small structural differences induce distinct 19F NMR shifts that can be used to identify each analyte. The utility of this method is illustrated by quantifying caffeine levels in coffee, by identifying ingredients in tea and energy drinks, and by discriminating between multiple biogenic amines with remote structural differences six carbon atoms away from the binding site. We further demonstrate the simultaneous identification of multiple neutral and anionic species in a complex mixture. [ABSTRACT FROM AUTHOR]

Published
2016
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26. Cu3(hexaiminotriphenylene)2: An Electrically Conductive 2D Metal-Organic Framework for Chemiresistive Sensing.

Author

Campbell, Michael G., Sheberla, Dennis, Liu, Sophie F., Swager, Timothy M., and Dincă, Mircea

Subjects
IMINO compounds, METAL-organic frameworks, CHEMICAL detectors, CHEMICAL resistance, ELECTRIC conductivity, COPPER, ELECTRIC properties
Abstract

The utility of metal-organic frameworks (MOFs) as functional materials in electronic devices has been limited to date by a lack of MOFs that display high electrical conductivity. Here, we report the synthesis of a new electrically conductive 2D MOF, Cu3(HITP)2 (HITP=2,3,6,7,10,11-hexaiminotriphenylene), which displays a bulk conductivity of 0.2 S cm−1 (pellet, two-point-probe). Devices synthesized by simple drop casting of Cu3(HITP)2 dispersions function as reversible chemiresistive sensors, capable of detecting sub-ppm levels of ammonia vapor. Comparison with the isostructural 2D MOF Ni3(HITP)2 shows that the copper sites are critical for ammonia sensing, indicating that rational design/synthesis can be used to tune the functional properties of conductive MOFs. [ABSTRACT FROM AUTHOR]

Published
2015
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39. Triptycene Diols: A Strategy for Synthesizing Planar π Systems through Catalytic Conversion of a Poly(p‐phenylene ethynylene) into a Poly(p‐phenylene vinylene)

Author

VanVeller, Brett, Robinson, Dale, and Swager, Timothy M.

Abstract

Durch Ringschluss gefestigt: Die Synthese einer neuen Klasse von Poly(p‐phenylenvinylenen) mit anellierten Alkeneinheiten ausgehend von den Poly(p‐phenylenethinylenen) beruht auf einer goldvermittelten Cycloisomerisierung der Alkineinheiten mit anhängenden Hydroxygruppen (siehe Schema). Die Ketten der Produkte sind entschieden starrer und stärker planar, was sich an deutlichen Änderungen der photophysikalischen Eigenschaften ablesen lässt.

Published
2012
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42. Claisen Rearrangement of Graphite Oxide: A Route to Covalently Functionalized Graphenes

Author

Ezequiel Schmois, William R. Collins, Timothy M. Swager, Joseph J. Walish, Wiktor Lewandowski, Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology. Department of Chemical Engineering, Massachusetts Institute of Technology. Department of Chemistry, Swager, Timothy M., Collins, William R., Lewandowski, Wiktor, Schmois, Ezequiel, Walish, Joseph, and Swager, Timothy Manning

Subjects
Aqueous solution, Graphene, food and beverages, Graphite oxide, General Chemistry, General Medicine, Catalysis, law.invention, Claisen rearrangement, chemistry.chemical_compound, chemistry, Covalent bond, law, Surface modification, Organic chemistry
Abstract

On the GO: The basal plane allylic alcohol functionality of graphite oxide (GO) can be converted into N,N-dimethylamide groups through an Eschenmoser–Claisen sigmatropic rearrangement by using N,N-dimethylacetamide dimethyl acetal. Subsequent saponification of these groups affords the carboxylic acids (see picture), which, when deprotonated, electrostatically stabilize the graphene sheets in an aqueous environment., Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies, United States. Intelligence Community (IC) Postdoctoral Research Fellowship Program

Published
2011

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