1. Key
Laboratory of Nonferrous Metal Chemistry and Resources Utilization
of Gansu Province, State Key Laboratory of Applied Organic Chemistry,
College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
2. Centro
de Quimica Estrutural, Complexo I, Instituto Superior Tecnico, The University of Lisbon, Av. Rovisco Pais, 1049-001 Lisbon, Portugal