a
Chemistry Department, Cambridge University, Lensfield Road, UK
E-mail: dsw1000@cus.cam.ac.uk
;
Fax: [+44]
(0)1223 336362
;
Tel: [+44]
(0)1223 763122
b
School of Chemistry, University of North London, UK
c
School of Computational Science & Information Technology, Florida State University, Tallahassee, USA
d
Department of Organic and Inorganic Chemistry, Universidad de Oviedo, Spain