Unraveling the interplay of different contributions to the stability of the quinhydrone dimer

Aim of this paper is to present a computational revisitation of the main structural and spectroscopic features of quinhydrone, a prototype of complexes built on noncovalent interactions, with a view to proposing an accurate yet computationally convenient approach to the characterization of such kind...

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Bibliographic Details
Published in:RSC advances 2014-01, Vol.4 (2), p.876-885
Main Authors: Barone, V., Cacelli, I., Crescenzi, O., d'Ischia, M., Ferretti, A., Prampolini, G., Villani, G.
Format: Article
Language:English
Subjects:
Charge transfer
Color
Computation
Determinants
Dimers
Dispersions
Mathematical analysis
Orientation
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Summary:Aim of this paper is to present a computational revisitation of the main structural and spectroscopic features of quinhydrone, a prototype of complexes built on noncovalent interactions, with a view to proposing an accurate yet computationally convenient approach to the characterization of such kind of complexes. Several methods are compared in terms of energy profiles along selected coordinates, which involve the relative distance and/or orientation of the two aromatic rings. MP2 and DFT calculations agree in indicating that H-bonding and dispersion forces play a more important role than charge transfer in stabilizing quinhydrone. Distance- and orientation-dependent overlap of pi clouds was found by TD-DFT calculations to be a major determinant of quinhydrone visible absorption and color.
ISSN:2046-2069
2046-2069
DOI:10.1039/C3RA46191B