Extending the Structures of the p-Sulfonatothiacalix[4]arene Dimers Through Second-sphere Coordination and π…π Stacking Interactions

Reactions of cobalt(II) nitrate or zinc(II) nitrate, tetrasodium p-sulfonatothiacalix[4]arene (Na(4)H(4)TCAS), and methylviologen dihexafluorophosphate (MV(PF6)(2)) afforded two isomorphous complexes, {[M(H2O)(6)](2+)[MV](2+)[(MV)(2)M-2(H2O)(4)(H(2)TCAS)(2)](4-)}center dot 14H(2)O (M=Co, 1; Zn, 2). In these two complexes, each two thiacalixarenes form a dimer with C-i symmetry through the coordination of sulfonate groups, and the above dimers further extend their structures through second-sphere coordination and pi center dot center dot center dot pi stacking interactions into three-dimension nets.