Synthesis, Structure and Characterization of Two Ferrocene Functionalized Cadmium Metal Organic Frameworks※
Received date: 2021-12-31
Online published: 2022-02-17
Supported by
National Natural Science Foundation of China(21871050)
Metal-organic frameworks (MOFs) are one of the most important crystalline porous materials. In recent years, there has been a strong interest in MOFs based devices with electrochemical activity. MOFs with redox activity are the ideal choice for such devices. 1,1'-Ferrocene dicarboxylic acid (H2FcDCA) containing ferrocene units is an ideal ligand for constructing MOFs with redox activity. However, due to its uncontrollable coordination mode and torsion angle, there is still a challenge to construct such materials. In this paper, two MOFs were synthesized by the reaction of functional ligand H2FcDCA with Cd2+ under different hydrothermal conditions: [Cd(FcDCA)(bpy)(H2O)]•(bpy) (1) (bpy=4,4'-bipyridine) and [Cd2(FcDCA)(bpy)(OX)(H2O)2]•2H2O (2) (H2OX=oxalic acid). The single crystal structure, fluorescence properties, redox activity of two compounds were characterized and described. In compound 1, Cd center was linked by FcDCA to form a zigzag chain, and it was linked by bpy to form a chain. Both chains linked each other by sharing the Cd center to give birth to a 2D layer with square lattice topology (sql). These layers were packed in AA mode along ac plane. Bpy as guest molecules are filled in the channel of it. By introducing H2OX in this system under similar condition, compound 2 with 3D framework was obtained. Different to compound 1, two Cd atoms were coordinated by OX ligands to form a binuclear Cd2 unit. The Cd2 units were connected by bpy and OX ligands to form a 3D framework with typical 4-connected diamond topology (dia). Each FcDCA ligand linked two Cd2 units as functional unit and pore partition agent. The whole framework of compound 2 can be simplified as 6-connected sxd topology by treating three kinds of ligands FcDCA, bpy and OX as linkers. Both compounds exhibited strong visible light absorption ability, photocurrent response, and typical redox properties of ferrocene, which may be good candidates for photoelectric catalysts.
Rong Zhang , Jiangping Liu , Ziyi Zhu , Shumei Chen , Fei Wang , Jian Zhang . Synthesis, Structure and Characterization of Two Ferrocene Functionalized Cadmium Metal Organic Frameworks※[J]. Acta Chimica Sinica, 2022 , 80(3) : 249 -254 . DOI: 10.6023/A21120611
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