One-Pot Synthesis of Supramolecular Isomers with Two-Dimensional 4⁴ Grid and Three-Dimensional 6⁴·8² NbO Frameworks: Solvothermal in Situ Ligand Formation and Conformational Isomers Separation

Two supramolecular isomers with two-dimensional 44 rhombic-grid and three-dimensional 64·82 compressed-NbO frameworks, α-[Cd(SH)2(S-bztpy)]·2H2O (1) and β-[Cd(SH)2(E-bztpy)]·2H2O (2) (bztpy = 1,2,4,5-tetra(4-pyridyl)benzene), have been synthesized in a one-pot reaction, involving solvothermal in situ ligand generation and conformational isomers separation of the bztpy ligand. The variation in structural topology results from the conformational freedom of the bztpy ligand through rotation of the CC bonds between pyridine and benzene rings, which imparts them with intriguingly different luminescence properties.