1. Institute of Physical and Theoretical
Chemistry, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland
2. Universidad de Puerto Rico en Humacao, Estacidn Postal CUH 100 Carr.908,
Humacao PR00791-4300, Puerto Rico
3. Universidad Metropolitans, P.O. Box 21150,
San Juan 00928-21150, Puerto Rico
4. Department of Chemistry and
Biochemistry, Jackson State University,
Jackson, Mississippi 39217, United States