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Figure 2. Infinite structures of <b>1</b> viewed along a axis showing hydrogen bonding between SO₄^2- ligand and crystalline methanol molecules.

Figure 3. <b>(a)</b> The coordination environment of <b>2</b> around the Co(II) center represented by thermal ellipsoids of 40% probability. Hydrogen atoms and solvent molecules are omitted for clarity. <b>(b)</b> Infinite struc-tures of <b>2</b> viewed along an axis. Color code: magenta, cobalt; cyan, nitrogen; black, carbon; yellow, sulfur.

Figure 4. The coordination environment of <b>3</b> around the Co(II) center represented by thermal ellipsoids of 40% probability. Hydrogen atoms and solvent molecules are omitted for clarity. Color code: magenta, cobalt; cyan, nitrogen; black, carbon; yellow, sulfur.

Figure 5. Calculation of the area of void formed in <b>3</b>. Two methanol molecules in void are omitted for clarity. Color code: magenta, cobalt; cyan, nitrogen; black, carbon; yellow, sulfur.

Figure 6. Infinite structures of <b>3</b> viewed along an axis showing two methanol molecules encapsulated within each void.