a
State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, P. R. China
E-mail: wkc@fjirsm.ac.cn
;
Fax: +86-591-83792932
;
Tel: +86-591-83792600
b
Graduate School of Chinese Academy of Sciences, Beijing 100039, P. R. China