Acknowledgments Funding from the Department of Chemistry, UNH, is gratefully acknowledged.

1. Synthesis of Hyperbranched Dendrimers Capable of Temperature Controlled Fe(II) Complexation via RAFT Polymerization Adam Dyer, Christian A. Tooley, Lea Nyiranshuti, John R. Csoros, Dr. Roy Planalpamn275@wildcats.unh.edu; Parsons Hall, 23 Academic Way, Durham NH 03824 Introduction The presence of heavy metal ions in water has been a long time issue. The purpose of this experiment was the development of a polymer bound ligand capable of the complexation metal ions in an aqueous environment. The synthesis of the polymer was done in a dendrimer-like fashion1, the core in this case being a metal ion complexed by ligands4. The polymer was then grown from the complex with crosslinkage between branches to create a molecular imprint of the metal ion. • Conclusions • Diphenylammonium triflate (DPAT) (1) was successfully isolated as a white powder (1.340 g, 4.2 mmol, 84%) with a melting point of 179-181 ℃ (lit3 178-183℃ ). • The outcome of the subsequent reactions were difficult to interpret because several preferred analysis methods were unavailable. • The red-brown precipitate was used as qualitative determination that complexation had taken place. • Results and Discussions • Diphenylammonium triflate (DPAT) (1) was successfully synthesized in reaction A and characterized by melting point determination. • In reaction B, DPAT was implemented as a catalyst for the esterification of 4,7-dihydroxy-1,10-phenanthroline and 2-(dodecylthiocarbonothioylthio)-2-methylpropionic acid to form 2 followed by was characterization by1H NMR (fig. 1). • The polymer chosen for reaction C was poly(N-isopropylacrylamide) due to its unique thermal phase transition. The phase transition occurs at the lower critical solution temperature, or LCST2. This phase transition was used to dissociate and associate the metal ion. DLS was used to determine the LCST of 5after 24 hours of dialysis (fig. 2). Red-brown precipitate was formed in solution above the LCST but below the LCST, the precipitate would disappear. Figure 1: 1H NMR data for compound 2 Figure 2: Temperature trend graph for polymer 5 Future Work The next step is to further analyze the polymer to quantify its ability to complex. This will be done with gel permeation chromatography and further test with dynamic light scattering. Acknowledgments Funding from the Department of Chemistry, UNH, is gratefully acknowledged. References D. Tzalis, Y. Tor.; Tetrahedron Letters. 1996, 37, 46. J. Zeng et al.; Journal of Colloid and Interface Science. 2009, 322, 654. K. Wakasugi, T. Misaki, K. Yamade.; Tetrahedron Letters. 2000, 41, 5249. G. R. Newkome, E. He, C. N. Mooreffield.; Chem. Rev. 1999, 99, 1689.