1. Tianjin Key Lab of Rare Earth Materials and Applications State Key Laboratory of Elemento-Organic Chemistry School of Materials Science and Engineering Nankai University Tianjin 300350 China
2. Theoretical Division Los Alamos National Laboratory Los Alamos NM 87545 USA
3. Department of Chemistry and Biochemistry Utah State University 0300 Old Main Hill Logan UT 84322-0300 USA
4. Grupo de Química Inorgánicay Materiales Moleculares Facultad de Ingenieria Universidad Autonoma de Chile El Llano Subercaseaux Santiago 2801 Chile