Ligand-Rearrangement-Induced Transformation from a 3D Supramolecular Network to a Discrete Octanuclear Cluster: A Good Detector for Pb 2+ and Cr 2 O 7 2 .

A three-dimensional supramolecular framework containing both left- and right-handed helixes, {[Zn(TTPA)Cl]·1.63HO} (), has been converted to a novel octanuclear cluster containing a metal-organic framework, [Zn(ptptp)Cl](ClO)·4CHOH·2HO (), induced by ligand rearrangement during a solvothermal process. The luminescent properties of indicate that the material can act as a selective probe toward Pb and CrO .