A Zinc(II) Porous Metal-Organic Framework and Its Morphologically Controlled Catalytic Properties in the Knoevenagel Condensation Reaction

Crystal structure of dichloride-bis(1-propylimidazole-κ 1 N)zinc(II), C12H20Cl2N4Zn

C12H20Cl2N4Zn, monoclinic, P21/n (no. 14), a = 9.9915(9) Å, b = 13.0923(12) Å, c = 13.1894(13) Å, β = 98.794(2)°, V = 1705.0(3) Å3, Z = 4, Rgt (F) = 0.0453, wRref (F 2) = 0.1248, T = 298(2) K.

Ligand geometry controlling Zn-MOF partial structures for their catalytic performance in Knoevenagel condensation

A series of novel Zn-MOFs {1Zn: [Zn(NIA)₂(3-bpdh)₂]; 2Zn: [Zn(NPA)₂(4-bpdh)₂H₂O]; 3Zn: [Zn₂(CHDA)₄(3-bpd)₂]} were constructed by dicarboxylic acid and N,N′-bis(pyridine-yl-ethylidene)hydrazine. Ligand geometry revealed 1D to 3D Zn-MOF crystal topologies, whose combined-mode could be affected by the conditions. All these conditions affected the micro-nano crystal morphologies, namely 1Zn micro-sheets or nanospheres, 2Zn micro-clusters or micro-stick, and 3Zn micro-clusters or hollowspheres that were obtained. The catalysts exhibited 100% selectivity for Knoevenagel condensation reactions, among which the benzaldehyde conversion rate of the 3Zn hollowspheres was the highest, reaching a peak of 90%.

Novel 1D to 3D structures of Zn-MOFs and their morphologies were assembled and showed high catalytic performance for Knoevenagel condensation.

A Zn based metal organic framework as a heterogeneous catalyst for C–C bond formation reactions

A Zn-Bp-BTC MOF was synthesized and characterized. The Zn-Bp-BTC MOF was successfully employed as a catalyst for Knoevenagel condensation, a multicomponent reaction and in benzimidazole synthesis.

Efficient heterogeneous catalysis by dual ligand Zn(ii)/Cd(ii) MOFs for the Knoevenagel condensation reaction: adaptable synthetic routes, characterization, crystal structures and luminescence studies

Chemically stable Zn(ii)/Cd(ii) MOFs as a heterogeneous catalysts for Knoevenagel condensation.