1. Department of Organic and Inorganic Chemistry, Federal University of Ceará, CX 12200 Fortaleza, Brazil, and Department of Chemistry and School of Pharmacy and Pharmaceutical Sciences, University of Manchester, Manchester M13 9PL, School of Chemistry, University of Leeds, Leeds LS2 9JT, and Department of Mechanical Engineering, King's College London, Strand, London WC2R 2LS, U.K.