S1 Supplementary Information Light-driven nanofiber and nanoring morphological transformations in organogels based on an azobenzene-bridged biscalix[4]arene Pei-Mei Su, a Kai-Chi Chang, a, * Cheng-Jhang Yang, a Yi-Chieh Liu a and Wen-Sheng Chung a, * Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan 30050, Republic of China wschung@nctu.edu.tw Page No. Contents S3 Materials and methods for the synthesis of compounds 14. S4-S7 Synthesis of azobenzene derivatives 9 and 11 and corresponding spectral identification data for compounds 14 and 911. S8 Table S1. Gelation properties of azobenzene derivatives 1-4 in various organic solvents. S9 Figs. S1 and S2. DLS diagram of a solution of E-1 in acetonitrile at 25 o C and TEM images of E-1 in various different solvents. S10 Fig. S3. The 1 H NMR spectra of E-1 (a) before and after irradiation of the solution (a) by 365 nm light for (b) 10 min, (c) 20 min, (d) 30 min, and (e) irradiating the sample (d) with a visible light (>450 nm) for 1 h. S11 Fig. S4. X-ray single crystal structures of E-1 with packing models. S12 Fig. S5. Variable Temperature UV-Vis spectra of E-1 in (a) acetonitrile and (b) para-xylene. Fig. S6. X-ray powder diffraction (XRD) of E-1 in (a) acetonitrile and (b) para-xylene. S13 Fig. S7. Variable Temperature 1 H NMR spectra of E-1 (1 mM in CD 3 CN) that was irradiated with UV for 20 min and its respective E-1/Z-1 ratios at different temperactures. S14 Fig. S8. (a) IR spectrum of compound 1 (1 mM in CH 3 CN) and (b) its respective IR spectrum after UV irradiation for 1 h. S15 Fig. S9. (a) IR spectrum of compound 2 (1 mM in CH 2 Cl 2 /MeOH = 1/5) and (b) its respective IR spectrum after UV irradiation for 1 h. S16 Fig. S10. The UV/Vis spectra of compound 1 (10 M, CH 3 CN) (a) irradiated by UV for different duration, (b) after further irradiation of sample (a) for different duration, and (c) the changes in absorbance of 1 with ten different UV/Vis irradiation cycles. Electronic Supplementary Material (ESI) for Chemical Communications. This journal is © The Royal Society of Chemistry 2017