Probing the Threshold to H Atom Transfer along a Hydrogen-Bonded Ammonia Wire

We characterized the entrance channel, reaction threshold, and mechanism of an excited-state H atom transfer reaction along a unidirectionally hydrogenbonded "wire"$-O-H \cdot \cdot \cdot NH_3 \cdot \cdot \cdot NH_3 \cdot \cdot \cdot NH_3 \cdot \cdot \cdot N$. Excitation of supersonically...

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Veröffentlicht in:Science (American Association for the Advancement of Science) 2003-12, Vol.302 (5651), p.1736-1739
Hauptverfasser: Tanner, Christian, Manca, Carine, Leutwyler, Samuel
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description We characterized the entrance channel, reaction threshold, and mechanism of an excited-state H atom transfer reaction along a unidirectionally hydrogenbonded "wire"$-O-H \cdot \cdot \cdot NH_3 \cdot \cdot \cdot NH_3 \cdot \cdot \cdot NH_3 \cdot \cdot \cdot N$. Excitation of supersonically cooled$7-hydroxyquinoline\cdot (NH_3)_3$to its vibrationless S1state produces no reaction, whereas excitation of ammonia-wire vibrations induces H atom transfer with a reaction threshold ≈ 200 wave numbers. Further translocation steps along the wire produce the S1state$7-ketoquinoline\cdot (NH_3)_3$tautomer. Ab initio calculations show that proton and electron movement along the wire are closely coupled. The rate-controlling S1state barriers arise from crossings of a ππ*with a Rydberg-type$\pi\sigma^\ast$state.
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Excitation of supersonically cooled$7-hydroxyquinoline\cdot (NH_3)_3$to its vibrationless S1state produces no reaction, whereas excitation of ammonia-wire vibrations induces H atom transfer with a reaction threshold ≈ 200 wave numbers. Further translocation steps along the wire produce the S1state$7-ketoquinoline\cdot (NH_3)_3$tautomer. Ab initio calculations show that proton and electron movement along the wire are closely coupled. 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Excitation of supersonically cooled$7-hydroxyquinoline\cdot (NH_3)_3$to its vibrationless S1state produces no reaction, whereas excitation of ammonia-wire vibrations induces H atom transfer with a reaction threshold ≈ 200 wave numbers. Further translocation steps along the wire produce the S1state$7-ketoquinoline\cdot (NH_3)_3$tautomer. Ab initio calculations show that proton and electron movement along the wire are closely coupled. The rate-controlling S1state barriers arise from crossings of a ππ*with a Rydberg-type$\pi\sigma^\ast$state.</abstract><cop>Washington, DC</cop><pub>American Association for the Advancement of Science</pub><pmid>14657491</pmid><doi>10.1126/science.1091708</doi><tpages>4</tpages></addata></record>
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source Science Magazine; Jstor Complete Legacy
subjects Ammonia
Atoms
Atoms & subatomic particles
Chemistry
Energy
Exact sciences and technology
Exhibits
Experiments
Fluorescence
Hydrogen
Inhalants
Ionization
Lasers
Lead
Molecules
Observations
Orbitals
Organic Chemistry
Properties
Protons
Spectral bands
Spectroscopy
Tautomers
Vibration
title Probing the Threshold to H Atom Transfer along a Hydrogen-Bonded Ammonia Wire
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