Three novel polyoxometalate-based inorganic–organic hybrid materials based on 2,6-bis(1,2,4-triazol-1-yl)pyridine

Three novel inorganic–organic hybrid materials [Co(btp)₂(W₅O₁₆)(H₂O)]_n (1), [Cd₃(btp)₆(PW₁₂O₄₀)₂(H₂O)₆·6H₂O]_n (2), and [Ag₃(btp)₂(PMo₁₂O₄₀)·1.5H₂O]_n (3) (btp = 2,6-bis(1,2,4-triazol-1-yl)pyridine) have been hydrothermally synthesized and characterized by IR spectroscopy, single-crystal X-ray diffraction, powder X-ray diffraction (PXRD), elemental analysis and thermal gravimetric analysis (TGA). The most striking structure feature of compound 1 is a 3D polycatenation framework, interpenetrated by a 2D 4-connected sql topology layer and a 3D 6-connected rob topology framework. Compound 2 exhibits a rare meso-helices 3D network with different chiralities crossing coexistence. Compound 3 also holds a 3D framework formed by linking terminal oxygen atoms of [α-PMo₁₂O₄₀]³⁻ anions and silver ions in a 2D metal–organic layer. Compound 1 displays antiferromagnetic behavior. The luminescence, electrochemical and photocatalytic properties of compounds 1–3 have also been investigated. Compound 3 exhibits significant electrochemical activity for the reduction of H₂O₂ while compounds 1 and 2 show efficient photocatalytic activities for the degradation of Rhodamine B (RhB). Furthermore, the three compounds display luminescence behaviors in the solid state.

Three novel inorganic–organic hybrid materials based on 2,6-bis(1,2,4-triazol-1-yl)pyridine have been synthesized with different polyanions and transition metal ions.

Copper cyanide polymers with controllable dimensions modulated by rigid and flexible bis-(imidazole) ligands: synthesis, crystal structure and fluorescence properties

Five controllable dimensions copper cyanide polymers have been synthesized by adjusting the steric configurations of imidazole ligands, which exhibit certain thermal stability and fluorescence properties.

Theoretical exploration on switchable NLO response induced by redox properties of polyoxometalates [XNbW11O40]n-/(n+1)- (X = Al, Si, P, S, Ga, Ge, As, Se)

Calculations based on density functional theory (DFT) have been performed to investigate the relationship between redox properties and second-order nonlinear optical (NLO) responses of Keggin-type anions [XNbW₁₁O₄₀]^n- (X = Al, Si, P, S, Ga, Ge, As, Se) and their corresponding heteropoly blues. The frontier molecular orbitals, NLO responses and electronic transition properties of fully oxidized anions and heteropoly blues were discussed. It is noticeable that the second-order NLO behaviors can be switched by reduced electrons for these Keggin-type anions. The calculated β₀ value of heteropoly blues [XNbW₁₁O₄₀]^(n+1)- (X = P, As, S) are 21-23 times as large as those of fully oxidized anions [XNbW₁₁O₄₀]^n- (X = P, As, S) according to CAM-B3LYP/6-31G* (LANL2DZ basis sets for metal atom) calculations in CH₃CN. The aim of this work is to combine the attractive redox properties and NLO response of polyoxometalates to obtain the switchable NLO materials.

Synthesis and photo-/electro-catalytic properties of Keggin polyoxometalate inorganic–organic hybrid layers based on d10 metal and rigid benzo-diazole/-triazole ligands

Unusual hepta- and nona-nuclear copper/silver complexes were introduced into different Keggin cluster leading to 2-D hybrid layers, which exhibit merit photo- and electro-catalytic properties.

Synthesis and photo-/electro-catalytic properties of a 3D POMOF material based on an interpenetrated copper coordination polymer linked by in situ dual ligands and Dawson-type phosphotungstates

A 3D Keggin POMOF based on a unique Cu/pz/pzc MOF was prepared and employed to degradation of typical dyes.

Supramolecular architecture based on high-lacunary sandwich-type building blocks: synthesis, characterization, and properties

The new supramolecular compound [Fe2(AsMo7O27)2](H2en)2(NH4)8·6H2O (1) (en = ethylenediamine) has been synthesized in aqueous solution and characterized by elemental analysis, thermal analysis, and single crystal X-ray diffraction. The structural analysis has revealed that 1 represents the first example of a polyoxometalate-based sandwich-type supramolecular hybrid constructed from hexalacunary building blocks. Owing to the presence of ethylenediammonium cations, the [Fe2(AsMo7O27)2]12– units are stabilized by multiple circular hydrogen bonds extending the structure into a 2D supramolecular framework. The magnetic properties and antitumor activities of 1 have also been studied.

The first 3D host–guest structure based on a three-fold interpenetrated Ag-pz coordination polymer network and Keggin-type aluminum tungstates with photo/electro-catalytic properties

A 3-D POMOF host–guest structure based on {AlW₁₂} and Ag-pz MOF units was prepared, which exhibit good photo- and electrocatalytic behavior.

Two novel topological structures of [Cu(CN)] coordination polymers modified by flexible triazole ligands

Triazole ligands have been introduced into the {Cu(CN)} skeleton to produce appealing polymers, which exhibit certain thermal stability and fluorescence properties.