1. State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Shanghai 200438 China
2. Key Laboratory of Coal Science and Technology Ministry of Education and Shanxi Province Taiyuan University of Technology Taiyuan 030024 China
3. Department of Chemistry Fudan University Shanghai 200438 China
4. Division of Theoretical Chemistry and Biology School of Biotechnology KTH Royal Institute of Technology 10691 Stockholm Sweden