A novel 3D CdII-coordination framework with helical units in a mixed flexible ligand system: Encapsulating right-handed helical water chains

In flexible co-ligand system, the P-handed [Cd(bpb)]n and the M-handed [Cd(pda)]n helical chains interweave mutually into a novel 3D coordination framework with diamondoid skeleton, namely, {[Cd(1,4-pda)(bpb)(H2O)]·H2O}n (1) [bpb = 1,4-bi(4-pyridyl)butane , 1,4-H2pda = 1,4-phenylenediacetic acid ]. Interestingly, 1D hydrophilic tunnel of 1 acts as a template for the formation of the P-handed 1D helical water chains, displaying molecular recognition and chirality transfer. The photoluminescent property and thermal stability of 1 were also discussed.