Effect of polyoxoanions and amide group coordination modes on the assembly of polyoxometalate-based metal–organic complexes constructed from a semi-rigid bis-pyridyl-bis-amide ligand

摘要: A series of polyoxometalate (POM)-based metal–organic complexes constructed from a semi-rigid bis-pyridyl-bis-amide ligand have been hydrothermally synthesized and structurally characterized: [Cu2L2(PMoVI11MoVO40)(H2O)2]·2H2O (1), [Cu2L2(PWVI11WVO40)(H2O)6]·H2O (2), [Cu2L2(SiW12O40)(H2O)6]·H2O (3) [Cu2L2(H2K2Mo8O28)(H2O)2] (4) (L = N,N′-bis(3-pyridinecarboxamide)-piperazine). Single-crystal X-ray analyses reveal that complex 1 is 2D architecture based on the Keggin-type [PMoVI11MoVO40]4− anions quadrate Cu2L2 loops. Isostructural 2 3 display supramolecular networks 1D infinite chains, which are loops Keggin polyoxoanions. Complex 4 exhibits 3D framework derived newly-reported [K2Mo8O28]6− polyoxoanions The L ligands show μ3-bridging coordination mode (via ligation two pyridyl nitrogen atoms one carbonyl oxygen atom) in 4, μ2-bridging atoms) 3, forming 1–4. influence amide group modes structural features POMs structures title has discussed. electrochemical properties selective photocatalytic reported this article.