Fig. 1. The asymmetric unit(water molecules were omitted)

Fig. 2. The structure on bc plane

Fig. 3. XRD for compound

Fig. 4. The FTIR spectra of compound (a) and ligand (b)

Fig. 5. Synchronous 2D-IR COS of compound (5~50 mT) (a1, a2) and (50~120 ℃) (b1, b2)

Fig. 6. The UV-Vis DRS of compound

Fig. 7. The TG spectrum of compound

Fig. 8. Complex and RhB

Fig. 9. XRD of complex and compound

Fig. 10. The RhB UV-Vis spectra of control group (a) and study group (b) under pH 0~8

Fig. 11. The standard curve of RhB under pH 1

Fig. 12. The UV-Vis spectra of RhB with different quantity compound