Ligand-configuration-dependent hybrid supramolecular isomers based on the octamolybdate building blocks from one-pot hydrothermal crystallization

Two novel 3-D hybrid supramolecular isomers, namely, α-[Cu2(ABPT)2(H2O)2(Mo8O26)]n (1) and β-[Cu2(ABPT)2(H2O)2(Mo8O26)]n·4nH2O (2), have been successfully isolated from one-pot hydrothermal crystallization and characterized. Single-crystal X-ray diffractions show that the ABPT ligands in compound 1 taking the transoid-configuration to link distorted octahedral copper centers into 1-D metal–organic chains, which are further interlaced by [Cu2(γ-Mo8O26)] inorganic ladder-like chains to generate a 3-D hybrid structure. In 2, the square-pyramidal CuII centers are firstly linked by cisoid-ABPT ligands to give 2-D metal–organic coordination layers, which are connected by [δ-Mo8O26]4− clusters into a 3-D hybrid network. Compounds 1 and 2 both can be regarded as 3,4-connected nets based on nonequivalent nodes with (43.6.86)2(42.6)2(42.84) and (4.82)2(4.82.103)2 topologies, respectively. By careful inspection of the structures of 1 and 2, it is believed that the ligand configuration plays a crucial role for the formation of these two hybrid supramolecular isomers.