1. Chemistry‐Institute of Fundamental Sciences, Massey University, Palmerston North 4442, New Zealand, Fax: +64‐6‐3505682
2. Chemistry Department, University of Auckland, Auckland 1142, New Zealand, Fax: +64‐9‐3737422
3. Department of Physics, University of Warwick, Coventry CV4 7AL, UK
4. School of Science, Griffith University, Nathan 4311, Queensland, Australia
5. Chemistry Department, University of Canterbury, Christchurch 8140, New Zealand
6. Chemistry M313, School of Biomedical, Biomolecular and Chemical Sciences, University of Western Australia, Crawley 6009, Western Australia, Australia