1. State
Key Laboratory of Crystal Materials, Shandong University, 250100 Jinan, Shandong, P. R. China
2. Centre
for Theoretical and Computational Chemistry, University of Tromsø, N-9037 Tromsø, Norway
3. Dipartimento
di Scienze Chimiche e Farmaceutiche, Università degli Studi di Trieste, 34127 Trieste, Italy