A novel 3D homochiral helical coordination polymer based on a flexible tripodal ligand

The reaction of the flexible tripodal ligand 1,3,5-tri(1,2,4-triazol-1-ylmethyl)-2,4,6-trimethylbenzene (tttmb) and Zn(II) with 3,3′,4,4′-benzophenone tetracarboxylic dianhydride (3,3′,4,4′-bptda) gives a novel 3D coordination polymer {[Zn1.5(tttmb)(Hbptc)]·H2O}n (1) (H4bptc = 3,3′,4,4′-benzophenone tetracarboxylic acid). In 1, the ancillary Hbptc3– groups connect Zn(II) ions to form a 2D layered structure. The tttmb ligands further link the 2D structure to generate a fascinating tridimensional polymeric architecture containing infinite 1D single-stranded helical chains of the same M handedness.