1. Department
of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7
2. Department
of Chemistry, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5
3. Research
Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan, Shanxi 030024, P. R. China
4. State
Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,
Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China