S1 Thermal Switching between Blue and Red Luminescence in Magnetic Chiral Cyanido-Bridged Eu III -W V Coordination Helices Szymon Chorazy, a,b Koji Nakabayashi, a Noriaki Ozaki, a Robert Pełka, c Tomasz Fic, d Jacek Mlynarski, b Barbara Sieklucka* b and Shin-ichi Ohkoshi* a,e a Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan. E-mail: ohkoshi@chem.s.u-tokyo.ac.jp (S. Ohkoshi), b Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland, c H.Niewodniczański Institute of Nuclear Physics PAN, Radzikowskiego 152, 31 -342 Kraków, Poland, d Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland, e CREST, JST, K’s Gobancho, 7 Gobancho, Chidoya-ku, Tokyo, 102-0076, Japan 1. Experimental details S2 2. Details concerning the calculations of magnetic properties of 1-(RR) and 1-(SS) S4 3. TGA curves for 1-(RR) (red) and 1-(SS) (Fig. S1) S6 4. Crystal Data and Structure Refinement for 1-(RR) and 1-(SS) (Table S1) S7 5. The crystal structure of 1-(RR) and 1-(SS): the asymmetric units with detailed description of Eu III complexes (Fig. S2) S8 6. Detailed structure parameters of 1-(RR) and 1-(SS) (Table S2) S9 7. Results of Continuous Shape Measure analysis for [W V (CN) 8 ] 3- units in 1-(RR) and 1-(SS) (Table S3) S11 8. Ideal and observed dihedral δ and φ angles in [W V (CN) 8 ] 3- units in 1-(RR) and 1-(SS) (Table S4) S11 9. Results of Continuous Shape Measure analysis for [Eu III (Pr i -Pybox)(dmf) 4 (NC) 2 ] + units in 1-(RR) and 1-(SS) (Table S5) S12 10. Ideal and observed dihedral δ angles in [Eu III (Pr i -Pybox)(dmf) 4 (NC) 2 ] + units of 1-(RR) and 1-(SS) (Table S6) S12 11. The crystal structure of 1-(RR) and 1-(SS): the view of closest interchain contacts and the arrangement of skeletal atoms around non-coordinated dmf (Fig. S3) S13 12. UV-Vis diffuse reflectance spectra of (RR)-/(SS)-Pr i -Pybox and TBA 3 [W V (CN)] 8 (Fig. S4) S14 13. Optical properties of Pr i -Pybox: absorption, excitation and emission spectra (Fig. S5) S14 14. Excitation spectra acquired at 77 K for 1-(RR) (Fig. S6) S15 15. References to Supporting Information S16 Electronic Supplementary Material (ESI) for RSC Advances This journal is © The Royal Society of Chemistry 2012