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.