Ultrafast Deactivation Processes in Aminopyridine Clusters: Excitation Energy Dependence and Isotope Effects

Fast excited-state relaxation in H-bonded aminopyridine clusters occurs via hydrogen transfer in the excited state. We used femtosecond pump−probe spectroscopy to characterize the excited-state reaction coordinate. Considerable isotope effects for partially deuterated clusters indicate that H-transf...

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Veröffentlicht in:	Journal of the American Chemical Society 2006-12, Vol.128 (49), p.15652-15656
Hauptverfasser:	Samoylova, E, Smith, Ritze, H.-H, Radloff, W, Kabelac, M, Schultz, T
Format:	Artikel
Sprache:	eng
Schlagworte:	Aminopyridines - chemistry Base Pairing Chemistry Deuterium - chemistry Dimerization Exact sciences and technology General and physical chemistry Heterocyclic compounds Heterocyclic compounds with only one n hetero atom and condensed derivatives Hydrogen - chemistry Hydrogen Bonding Models, Molecular Organic chemistry Preparations and properties Spectrophotometry Thermodynamics
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container_end_page	15656
container_issue	49
container_start_page	15652
container_title	Journal of the American Chemical Society
container_volume	128
creator	Samoylova, E Smith Ritze, H.-H Radloff, W Kabelac, M Schultz, T
description	Fast excited-state relaxation in H-bonded aminopyridine clusters occurs via hydrogen transfer in the excited state. We used femtosecond pump−probe spectroscopy to characterize the excited-state reaction coordinate. Considerable isotope effects for partially deuterated clusters indicate that H-transfer is the rate-limiting step and validate ab initio calculations in the literature. A nonmonotonous dependence on the excitation energy, however, disagrees with the picture of a simple barrier along the reaction coordinate. An aminopyridine dimer serves as a model for Watson−Crick base pairs, where similar reactions have been predicted by theory.
doi_str_mv	10.1021/ja0638612
format	Article
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Am. Chem. Soc</addtitle><date>2006-12-13</date><risdate>2006</risdate><volume>128</volume><issue>49</issue><spage>15652</spage><epage>15656</epage><pages>15652-15656</pages><issn>0002-7863</issn><eissn>1520-5126</eissn><coden>JACSAT</coden><abstract>Fast excited-state relaxation in H-bonded aminopyridine clusters occurs via hydrogen transfer in the excited state. We used femtosecond pump−probe spectroscopy to characterize the excited-state reaction coordinate. Considerable isotope effects for partially deuterated clusters indicate that H-transfer is the rate-limiting step and validate ab initio calculations in the literature. A nonmonotonous dependence on the excitation energy, however, disagrees with the picture of a simple barrier along the reaction coordinate. 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subjects	Aminopyridines - chemistry Base Pairing Chemistry Deuterium - chemistry Dimerization Exact sciences and technology General and physical chemistry Heterocyclic compounds Heterocyclic compounds with only one n hetero atom and condensed derivatives Hydrogen - chemistry Hydrogen Bonding Models, Molecular Organic chemistry Preparations and properties Spectrophotometry Thermodynamics
title	Ultrafast Deactivation Processes in Aminopyridine Clusters: Excitation Energy Dependence and Isotope Effects
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