1. School of Natural and Environmental Sciences, Bedson Building Newcastle University Newcastle upon Tyne NE1 7RU UK
2. Crystallography Laboratory School of Natural and Environmental Sciences, Bedson Building Newcastle University Newcastle upon Tyne NE1 7RU UK
3. Department of Chemistry University of Antwerp Groenenborgerlaan 171 2020 Antwerp Belgium
4. Molecular Photonics Laboratory, School of Natural and Environmental Sciences, Bedson Building Newcastle University Newcastle upon Tyne NE1 7RU UK