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

2013; Royal Society of Chemistry; Volume: 4; Issue: 2 Linguagem: Inglês

10.1039/c3ra46191b

2046-2069

Vincenzo Barone, Ivo Cacelli, Orlando Crescenzi, Marco d’Ischia, Alessandro Ferretti, Giacomo Prampolini, Giovanni Villani,

Molecular spectroscopy and chirality

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 π clouds was found by TD-DFT calculations to be a major determinant of quinhydrone visible absorption and color.