Synthesis of trans-1,4-cyclohexanedisulfonic acid and its zinc salt – A belt-like metal–organic coordination polymer with tetrahedrally and octahedrally coordinated zinc ions

Diastereomerically pure trans-1,4-cyclohexanedisulfonic acid H2CDS was prepared in three steps from 1,4-cyclohexanediol (cis/trans-mixture) as a new linker molecule for metal–organic coordination polymers. The crystalline zinc salt contained two molecules DMF per formular unit. Infinite polymeric belts were observed in the solid state structure of [Zn(CDS)(dmf)2]. These flat belts were formed by connecting two chains of Zn(dmf)-CDS-polymers bearing tetrahedrally coordinated Zn2+ ions in one chain and octahedrally coordinated Zn2+ centers in the second. Thermal analysis of this polymer revealed its stability up to 400 °C, above which it decomposed cleanly under formation of crystalline ZnO.

Graphical abstractOctahedrally and tetrahedrally coordinated zinc ions are forming a belt-like coordination polymer with trans-1,4-cyclohexanedisulfonic acid.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► trans-1,4-Cyclohexanedisulfonic acid H2CDS is prepared from the respective diol. ► H2CDS shall be a new linker molecule for metal–organic coordination polymers. ► Infinite polymeric belts are observed in the crystalline zinc salt [Zn(CDS)(dmf)2]. ► These belts contain Zn(dmf)-CDS-polymers with tetrahedral and octahedral Zn2+ ions. ► Polymeric [Zn(CDS)(dmf)2] is stable up to 400 °C, above it decomposes to ZnO.