1. School of Mathematical and Physical Sciences, University of Technology Sydney, Ultimo 2007, Australia
2. NMR Facility, Mark Wainwright Analytical Centre, The University of New South Wales, Sydney 2052, Australia
3. School of Chemistry, The University of New South Wales, Sydney 2052, Australia
4. Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4