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