1. Department of Physical and Environmental Sciences University of Toronto Scarborough 1265 Military Trail Toronto M1C1A4 Canada
2. Department of Chemistry University of Toronto 80 St. George Street Toronto M5S 3H6 Canada
3. Departamento de Tecnologia Química Centro de Ciências Exatas e, Tecnologia Universidade Federal do Maranhão CEP 65080-805 São Luís MA Brazil