Nature of Large Temporal Fluctuations of Hydrogen Transfer Rates in Single Molecules

The Journal of Physical Chemistry Letters
Lukasz PiatkowskiJacek Waluk

Abstract

Double hydrogen transfer was monitored in single molecules of parent porphycene and its tetra- t-butyl derivative using confocal fluorescence microscopy. The molecules have been embedded in a polymer matrix. Under such conditions, a significant fraction of the population reveals a huge decrease of the tautomerization rate with respect to the value obtained from ensemble studies in solution. This effect is explained by a model that assumes that the rate is determined by the reorganization coordinate that involves slow relaxation of the polymer matrix. The model provides indirect evidence for the dominant role of tunneling. It is proposed that tautomerization in single molecules of the porphycene family can be used to probe polymer relaxation dynamics on the time scale ranging from picoseconds to minutes.

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Citations

Oct 13, 2018·Physical Chemistry Chemical Physics : PCCP·Victoriya KimJacek Waluk
Jul 21, 2020·Physical Chemistry Chemical Physics : PCCP·Piotr KasprzyckiPiotr Fita
Sep 30, 2020·ChemPlusChem·Arkadiusz ListkowskiJacek Waluk
Sep 10, 2019·Frontiers in Chemistry·Ruby Srivastava
Feb 10, 2021·Chemistry : a European Journal·Arkadiusz ListkowskiJacek Waluk
Apr 29, 2021·Methods and Applications in Fluorescence·Aleksandra BednarzJacek Waluk
Jan 21, 2021·The Journal of Physical Chemistry Letters·Quan LiuAlfred J Meixner
May 20, 2020·The Journal of Physical Chemistry. a·Michał KijakJacek Waluk
Aug 28, 2020·Organic Letters·Anup RanaPradeepta K Panda
Mar 4, 2020·The Journal of Physical Chemistry. a·Quan LiuAlfred J Meixner
Jan 17, 2019·Journal of the American Chemical Society·Yair LitmanMariana Rossi

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