Dresden 2009 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 7: Liquids
CPP 7.5: Vortrag
Montag, 23. März 2009, 19:00–19:15, ZEU 160
Chelation in a water/triamine mixture: investigation of structure formation in space and time — •Ulrich Müller1, Martine Philipp1, Jörg Baller1, Roland Sanctuary1, Pierre Seck1, Michael Veith2, and Jan Kristian Krüger1 — 1Université du Luxembourg, FSTC, Campus Limpertsberg, 162a avenue de la Faiencerie, L-1511 Luxembourg — 2Universität des Saarlandes,Anorganische Chemie, Fachbereich 8.11, Gebäude C 4.1, Postfach 151150, D-66041 Saarbrücken
Chelation is the binding or complexation of a bi- or multidentate ligand. Usually this term refers to complexes of metal ions and the chelating agent but can also refer to the complexation of water by polyamines. We will present first results of the chelation of water by diethylene triamine (DETA). DETA is tridentate ligand and exhibits a good miscibility with water. Our study comprises the investigation of the DETA concentration dependence of the mass density, of the refractive index and the longitudinal elastic modulus as well as time and space dependence of the chelation process at a water/DETA interface as measured by time resolving Brillouin microscopy. The results show that the longitudinal elastic modulus and the mass density possess a maximum over concentration whereas the refractive index does not. This strong deviation from the Lorenz-Lorentz behaviour indicates a significant influence of chelation and the accompanying change in structure on the electronic polarizability. Futhermore we are able to show a complex structure formation process at the water-DETA interface leading to an astonishingly asymmetric interphase.