An unusual 3D pillared-layer cobalt(II) coordination polymer containing helical motifs and novel topology constructed from mixed ligands

► The 2D undulated layer of 1 consists of alternating left- and right-handed helical motifs. ► The overall structure of 1 shows an intriguing 3D binodal (3,5)-connected fsc network. ► Complex 1 displays a familiar uninodal pcu net based on the dimeric [Co2] units (SBUs). ► The magnetic measurement revealed that 1 shows the antiferromagnetic coupling between CoII ions.