Supporting Information Steering polyoxometalates transformation from octahedral to tetrahedral coordination by counter-cations

Section S1. Materials and Methods Section S2. Result discussion about microemulsion extraction of POVs. Section S3. Calculation of combining stoichiometry (n) and extraction equilibrium constant (Ke). Section S4. Calculation of enthalpy change of extraction reaction. Section S5. Recrystallization of MTA2[V10O26] crystals. Figure S1. Influences of extraction conditions on the extraction efficiency of POVs. Figure S2. The FT-IR spectra of microemulsion before and after being loaded with POVs. Figure S3. Selectivity of the MTA+ cations to POVs during microemulsion extraction. Figure S4. Flow chart of the whole microemulsion extraction process to investigate the selectivity of MTA+ cations to POVs. Figure S5. Stability comparison of POVs with two hydrogen atoms at different positions. Figure S6. Structures of another two relative orientations between MTA+ and H2V10O28. Figure S7. Classification of vanadium nuclei in POVs. Figure S8. Expanded envelopes of decavanadate anions obtained by MALDI-TOF-MS. Figure S9. Raman spectra of the microemulsion phase before and after being loaded with POVs. Figure S10. TEM-SAED of obtained MTA2[V10O26] crystals. Figure S11. (a) Experimental and (b) simulated XRD patterns of obtained MTA2[V10O26] crystals. Table S1. Atomic-number-to-charge ratios (N/Z) of polyoxovanadates at different pH values. Table S2. Chemical composition of the industrial leaching liquor of vanadium. Reference (34-40)