Dresden 2011 – scientific programme
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MO: Fachverband Molekülphysik
MO 22: Femtosecond Spectroscopy IV
MO 22.4: Talk
Thursday, March 17, 2011, 15:15–15:30, TOE 317
Orientational dynamics of new Tröger bases with ESIPT investigated by ultrafast optically-heterodyne-detected optical Kerr effect — Guilherme C Vebber1, Ricardo R.B. Correia2, Fabiano Rodembusch3, Valter Stefani3, Marcus Motzkus1, and •Tiago Buckup1 — 1Physikalisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, D-69120 Heidelberg, Germany. — 2Instituto de Física, UFRGS, 91501-970, Brazil. — 3Instituto de Química, UFRGS, 91501-970, Brazil.
Tröger bases (TB) are well known molecules with broad application as artificial receptor systems. Due to its intrinsic chirality, several derivatives have been used as chiral solvent agents, particularly as specific receptors of DNA and amino acids. In spite of its potential in a wide range of applications, little is known about the intermolecular interactions of TB in solution. In this regard, we investigate the ultrafast orientation dynamics of a new TB derivative [1] capable of excited-state intramolecular proton transfer (ESIPT), which is very sensitive with the interaction with the environment. Optically-heterodyne-detected optical Kerr effect (OHD-OKE) with sub-40fs resolution is applied to Tröger bases composed of 2-(4amino-2-hydroxyphenyl)benzazoles dissolved in chloroform. Particularly, the dependence of orientation diffusion and specific molecular interactions on the concentration of the TB is investigated for two derivatives. [1] Abella, C.A.M. et. al. Tetrahedron Letters 45 (2004) 5601.