1. MOE Key Laboratory of Natural Resources of the Changbai Mountain and Functional MoleculesDepartment of ChemistryYanbian University Park Road 977 Yanji 133002 Jilin China
2. Division of Materials ScienceGraduate School of Science and TechnologyNara Institute of Science and Technology 8916-5 Takayama Ikoma Nara 630-0192 Japan