Two metal-organic frameworks (MOFs) containing rigid bis(triazole) ligand, namely {[Zn₂(L)(TP)₂(H₂O)·H₂O]}_n (1) and [Zn(L)(HTMA)]_n (2), where L=4, 4'-(3, 3'-dimethyl-(1, 1'-biphenyl)-4, 4'-diyl)bis(4H-1, 2, 4-triazole), H₂TP=terephthalic acid, H₃TMA=1, 3, 5-benzenetricarboxylic acid, were synthesized by using acid-base mixed ligands strategy and structurally characterized by X-ray single-crystal diffraction. Structural analysis reveals that MOF 1 displays a 3, 6-connected 2D structure with a new topological point symbol of (4²·6)₂(4⁸·6⁶·8), while MOF 2 presents a 2D sql topology structure. The catalytic studies reveal that 2 exhibits excellent catalytic activity for the cycloaddition reaction of CO₂ with epoxides under mild conditions. Furthermore, 2 can be reused at least three times while maintaining its catalytic ability.

Two new viologen-polyoxometalate hybrid crystalline materials: (MV)₂[HPW₂^ⅤW₁₀^ⅥO₄₀] ·2H₂O (1) and (EV)₂[Mo₈O₂₆] (2) have been synthesized by using the cations of 1, 1'-dimethyl-4, 4'-bipyridinium dichloride (methyl viologen, MV) and 1, 1'-diethyl-4, 4'-bipyridinium dibromide (ethyl viologen, EV) as the electron acceptors, and the electron-rich polyoxometalate anions as the electron donors. The structures of compounds 1 and 2 have been determined by single-crystal X-ray crystallography. Hydrogen bond interactions exist between the cations and the anions in 1 and 2. Interestingly, 2 has a photochromic performance with a light response time within 1 min. The photochromic mechanism of compound 2 has been investigated by solid-state diffuse reflection, electron paramagnetic resonance and theoretical calculation. 1 and 2 show good catalytic performance in the photocatalytic degradation of several organic dyes (methylene blue, pararosaniline hydrochloride and rhodamine 6G).

(2E, 6E)-4-methyl-2, 6-bis(pyridin-3-ylmethylene)cyclohexan-1-one (L₁) and 4-methyl-2, 6-bis[(E)-4-(pyridin-4-yl)benzylidene]cyclohexan-1-one (L₂) were synthesized and combined with isophthalic acid (H₂IP), then under solvothermal conditions, to react with transition metals achieving four novel metal organic frameworks (MOFs): [Zn(IP)(L₁)]_n (1), {[Cd(IP)(L₁)]·H₂O}_n (2), {[Co(IP)(L₁)]·H₂O}_n (3), and [Zn(IP)(L₂)(H₂O)]_n (4). MOFs 1-4 have been characterized by single-crystal X-ray diffraction, powder X-ray diffraction, thermogravimetry, and elemental analysis. Single-crystal X-ray diffraction shows that MOF 1 crystallizes in the monoclinic crystal system with space group P2₁/n, and MOFs 2-4 belong to the triclinic system with the P1 space group. 1-3 are 2D sheet structures, 2 and 3 have similar structural characters, whereas 4 is a 1D chain structure. Furthermore, 1-3 exhibited certain photocatalytic capability in the degradation of rhodamine B (RhB) and pararosaniline hydrochloride (PH). 4 could be used as a heterogeneous catalyst for the Knoevenagel reaction starting with benzaldehyde derivative and malononitrile. 4 could promote the reaction to achieve corresponding products in moderate yields within 3 h. Moreover, the catalyst exhibited recyclability for up to three cycles without significantly dropping its activity. A mechanism for MOF 4 catalyzed Knoevenagel condensation reaction of aromatic aldehyde and malononitrile has been initially proposed.

以1，1′-二甲基-4，4′-联吡啶(甲基紫精，MV)二氯化物和Keggin型多酸单元合成的晶态材料(MV)₂[HPW^Ⅴ₂W^Ⅵ₁₀O₄₀]·2H₂O为催化剂，在无有机溶剂、室温条件下合成了一系列β-氨基醇类化合物。该催化剂不仅能够高效催化β-氨基醇的合成，而且具有良好的稳定性及可回收性。经过6次循环使用后，催化剂活性未出现明显下降，表明其具有较好的循环利用潜力。与传统方法相比，该反应体系不使用有机溶剂并具有反应条件温和、操作简单、环境友好等优点。