Figure 4.

X-Ray crystal structure of 11⋅9NO₃⋅21.5H₂O (A, top view; B, side view). Nitrate anions and water molecules are omitted. Three molecules of 8 are colored in green, blue-green, and blue. TCA³⁻ units are orange, and sulfur atoms are yellow. (C) Two TCA³⁻ parts at edges bind to 8 through Zn²⁺—S⁻ (2.31 Å in average) coordination bonds. (D) The TCA³⁻ part at the middle bind to 8 through Zn²⁺—N⁻ (2.07 Å in average) and Zn²⁺—S (2.88 Å in average) coordination bonds. (E) Three phenyl groups from three 8 units.