[1] Univ Durham, Dept Chem, Durham DH1 3LE, England
[2] Univ Waterloo, Dept Chem, Waterloo, ON N2L 3G1, Canada
[3] Hong Kong Univ Sci & Technol, Dept Chem, Hong Kong, Hong Kong, Peoples R China
[4] Univ Newcastle Upon Tyne, Dept Chem, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England