TECHNICAL ABSTRACTS 11:25 AM – 11:45 AM
“1.54 μM Emission Characteristics In Highly Crystalline Er:Zno Films Synthesized By Pulsed‐Laser Deposition” L. Douglas, H. Mustafa, R. Mundle, C.E. Bonner, and A.K. Pradhan
Center for Materials Research, Norfolk State University, 700 Park Avenue, Norfolk, VA Abstract We report on the fabrication of high‐quality Er:ZnO films by the pulsed‐laser deposition technique at high temperature followed by insitu‐annealing. The films demonstrate remarkable crystalline quality and contain self‐assembled grains. Although the films show very low electrical resistivity (~6.41 x 10‐4 μ‐cm) at room‐temperature, a semiconductor‐ metal transition was observed at 190 K. The films show pronounced room‐temperature emission characteristics at 1.54 μm, illustrating the activation of Er3+ ions in ZnO matrix. Furthermore, no quenching effects in PL characteristics at 1.54 μm were observed up to 2 wt % of Er‐doping in ZnO at room‐temperature. 11:45 AM – Poster Talk “Titanium Catalyzed 3‐Component Coupling & Intramolecular 11:50 AM Asymmetric Hydroamination Of Aminoalkenes” Kevin R. Gipson1, Aaron L. Odom*2, Supriyo Majumder3 Michigan State University , Department of Chemistry, East Lansing, MI Abstract Asymmetric hydroamination of amimoalkenes is an efficient and atom‐economical process to produce enantiomerically pure pyrrolidines. Pyrrolidines are important from the pharmaceutical perspective. We have synthesized a new chiral ligand by the condensation reaction between 2, 2’ diamino‐1‐1’ binapthalene and 2‐formyl‐5 mesityl pyrrole. The catalysts are made by reacting the chiral ligand with TiCl4 and also with ZrCl4. Currently we are in the process of probing the activity of these two catalysts. We are also looking at ways to generate a new cationic complex for their use in asymmetric hydroamination reaction. 104