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