By introducing a series of pyridine derivatives as organic moiety, four Keggin-based compounds were synthesized, namely [Ag(Py2Piz)2(H2PW12O40)]·2H2O (1), [Ag4(AcyPh)4(H2SiMo12O40)2]·2H2O (2), [Ag2(Py3Piz)2(H2O)2(H3SiMo12O40)2]·6H2O (3) and {Ag4(Py2TTz)4[Ag(PMo12O40)2]}·Ag(Py2TTz)·2(Py2TTz)·6H2O (4) (Py2Piz = 4,5-Bis(2-pyridinyl)imidazole, Py3Piz =...

By changing the POM anions and TM ions, a series of compounds with multi-nuclear loops was formed.

Through tuning piperazine and morpholine groups and spacer length in organic ligands, five [Mo 8 O 26 ] 4− -based compounds have been obtained, [(H 2 tep) 2morpholine, and tpm = 4-(2-(4H-1,2,4-triazol-4yl)propyl)morpholine). In compound 1, the N atom of tep directly connects the Mo atom of a [γ-Mo 8 O 26 ] 4− anion through a Mo−N bond without transition-metal ions. The [γ-Mo 8 O 26 ] 4− anions in 2 are linked by a Zn atom to construct an inorganic layer with tep ligand coordination with Zn and Mo atoms by Zn−N and Mo−N bonds.The N atom in the piperazine group does not link with the metal atoms in 1 and 2. However, the O atom in the morpholine group in 3−5 coordinates with Ag, Cu, and Co atoms, respectively. Compound 3 shows a 3D framework with 2D layers linked by binuclear Ag clusters. Compounds 4 and 5 are isostructural, containing two kinds of chains. The chains connect each other to form a 3D framework. Both N and O of tem and tpm participate to link metal atoms in 3−5, which are conducive to build high-dimensional structures. The spacer length, piperazine and morpholine groups, and different metal ions all exhibit effects on structures under hydrothermal conditions. Furthermore, electrocatalytic reduction of KNO 2 and KBrO 3 and electrocatalytic oxidation of ascorbic acid were studied. These compounds can be used as electrochemical sensors for detecting NO 2 − . They also show selective photocatalytic properties. Compounds 1−5 own properties of capacitor materials.

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