Supramolecular Isomerism in Coordination Polymers: Conformational Freedom of Ligands in [Co(NO₃)₂(1,2‐bis(4‐pyridyl)ethane)_1.5]_<i>n</i>

Bilayers or open-framework ladder structure? Which supramolecular isomer is formed from Co(NO3)2 and the nonrigid spacer 1,2-bis(2-pyridyl)ethane depends on the crystallization conditions. The open-framework coordination polymer contains large, square cavities of 10 × 10 Å. A section of the bilayer motif is shown on the right.