1. Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1, Kasuga-koh-en, Kasuga-shi 816-8580, Japan
2. Faculty of Pharmacy, University of Lisbon, Av. Forças Armadas, P-1649 Lisboa, Portugal
3. Present address: Instituto Tecnologico e Nuclear, Estrada Nacional 10, Sacavem, Portugal
4. Department of Chemistry, Faculty of Science, United Arab Emirates University, PO Box 17551, Al Ain, UAE.