ARTICLE pubs.acs.org/IC
Eu3þ-Mediated Polymerization of Benzenetetracarboxylic Acid Studied by Spectroscopy, Temperature-Dependent Calorimetry, and Density Functional Theory Astrid Barkleit,*,†,‡ Satoru Tsushima,† Olesya Savchuk,† Jenny Philipp,† Karsten Heim,† Margret Acker,§ Steffen Taut,§ and Karim Fahmy† †
Institute of Radiochemistry, Helmholtz-Zentrum Dresden-Rossendorf e.V., P.O. Box 510119, 01314 Dresden, Germany Division of Radiochemistry, Department of Chemistry and Food Chemistry, Technische Universit€at Dresden, 01062 Dresden, Germany § Central Radionuclide Laboratory, Technische Universit€at Dresden, 01062 Dresden, Germany ‡
bS Supporting Information ABSTRACT: Thermodynamic parameters for the complexation of Eu3þ with pyromellitic acid (1,2,4,5-benzenetetracarboxylic acid, BTC) as a model system for polymerizable metal-complexing humic acids were determined using temperature-dependent time-resolved laser-induced fluorescence spectroscopy (TRLFS) and isothermal titration calorimetry (ITC). At low metal and ligand concentrations (
