Characterization and properties of layered tetragonal metal phosphonates with Sulfoethyl and Sulfophenyl groups

A set of five layered tetravalent metal phosphonates, zirconium 2-sulfoethylphosphonate, titanium and tin 4-sul-fophenylphosphonates, and mixed titanium and tin 4-sulfophenylphosphonate-phosphates, were prepared and characterized. All compounds are layered, their inorganic part is similar to that of alpha-zirconium hydrogen phosphate with the sulfophenyl or sulfoethyl groups jutting out of the layers into the interlayer space. Their basal spacing and the amount of water in the interlayer space depends on the relative humidity of the atmosphere. All these compounds are able to interact with basic compounds. Ionic conductivity of zirconium 2-sulfoethylphosph-onate, titanium and tin 4-sulfophenylphosphonate strongly depends on relative humidity. The charge carriers are protons and their movement is governed by a Grotthuss mechanism.

Automated summary

A set of layered tetravalent metal phosphonates, including zirconium 2-sulfoethylphosphonate, titanium and tin 4-sulfophenylphosphonates, and mixed titanium and tin 4-sulfophenylphosphonate-phosphates, were synthesized and characterized. These compounds have a layered structure, similar to alpha-zirconium hydrogen phosphate, with sulfophenyl or sulfoethyl groups extending into the interlayer space. The basal spacing and water content in the interlayer space depend on humidity. These compounds can interact with basic compounds. The ionic conductivity of zirconium 2-sulfoethylphosphonate, titanium and tin 4-sulfophenylphosphonate is strongly influenced by humidity, with proton movement governed by a Grotthuss mechanism.