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Cooperative effect of hydrogen-bonded chains in the environment of a π → π* chromophore

Leutwyler, Samuel
Published in Journal of Physical Chemistry. A. 2009, vol. 113, no. 36, p. 9766-9771
Abstract Laser resonant two-photon ionization UV spectra provide clear evidence that the effect of increasing the length of the hydrogen-bonded chain consisting of molecules such as NH3, H2O, or CH3OH on the π → π* excitations of cis-7-hydroxyquinoline (cis-7HQ) is strongly cooperative [Thut; et al. J. Phys. Chem. A 2008, 112, 5566.] A theoretical analysis of the experimental data is provided to identify the origin of this cooperativity for four chains. The computational method to determine the changes of the electronic structure of a molecule due to interactions with its environment uses the nonempirical expression for the embedding potential [Wesolowski; Warshel J. Phys. Chem. 1993, 97, 8050.] It is concluded that the electronic coupling between the molecules at the ends of the chain, which are hydrogen-bonded to cis-7HQ, plays a crucial role in this cooperativity.
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Research group Groupe Wesolowski
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FRADELOS, Georgios et al. Cooperative effect of hydrogen-bonded chains in the environment of a π → π* chromophore. In: Journal of Physical Chemistry. A, 2009, vol. 113, n° 36, p. 9766-9771. https://archive-ouverte.unige.ch/unige:6178

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Deposited on : 2010-04-20

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