1. Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
2. Institute of Coal Chemistry; Chinese Academy of Sciences; Taiyuan 030001 China
3. Department of Chemistry; University of Sheffield; Brook Hill Sheffield S3 7HF UK
4. Department of Materials Science and Engineering; School of Molecular Science and Engineering; Vidyasirimedhi Institute of Science and Technology (VISTEC); Rayong 21210 Thailand