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

Three manganese/4-sulfocalix[4]arene complexes, namely, {H[(C28H20O16S4)Mn(H2O)4Mn0.5(H2O)2]}n ·6nH2O (1), {NH4[(C28H20O16S4)Mn(H2O)4Mn0.5(H2O)2]}n · 5nH2O (2), [(C28H20O16S4)Mn2(H2O)8]n · 6nH2O (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.

Graphical abstractThree manganese/4-sulfocalix[4]arene complexes have been synthesized under different pH conditions. Their structures range from one-dimensional to two-dimensional coordination complexes, showing structural effects on pH response.Figure optionsDownload full-size imageDownload as PowerPoint slide