1. Systran Corporation, Dayton, OH 45432
2. Department of Chemistry and Polymer Research Center, University of Cincinnati, Cincinnati, OH 45221-0172
3. Permanent address: Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan
4. Current address: PPG Industries, Inc., 440 College Park Drive, Monroeville, PA 15146
5. Wright Laboratory, Materials Directorate, Wright-Patterson Air Force Base, Dayton, OH 45433