PH-controlled the formation of 4-sulfocalix[4]arene-based 1D and 2D coordination polymers

Abstract

Three manganese/4-sulfocalix[4]arene complexes, namely, {H[(C 28H 20O 16S 4)Mn(H 2O) 4Mn 0.5(H 2O) 2]} n ·6 nH 2O ( 1), {NH 4[(C 28H 20O 16S 4)Mn(H 2O) 4Mn 0.5(H 2O) 2]} n · 5 nH 2O ( 2), [(C 28H 20O 16S 4)Mn 2(H 2O) 8] n · 6 nH 2O ( 3), have been synthesized under different pH conditions. Complex 1, which exhibits a one-dimensional (1D) structure, is formed at [H +] = 2.0 mol L −1. Reaction at pH 4 leads to another one-dimensional (1D) coordination polymer of 2. At pH 5, a two-dimensional (2D) coordination polymer of complex 3 is formed, showing clearly structural effects on pH response.