Redox-Active Metal-Organic Frameworks with Three-Dimensional Lattice Containing the <i>m</i>-Tetrathiafulvalene-Tetrabenzoate

oleh: Hongrui Huang, Zhi-Mei Yang, Xiao-Cheng Zhou, Gen Zhang, Jian Su

Format: Article
Diterbitkan: MDPI AG 2022-06-01

Deskripsi

Metal-organic frameworks (MOFs) constructed by tetrathiafulvalene-tetrabenzoate (H<sub>4</sub>TTFTB) have been widely studied in porous materials, while the studies of other TTFTB derivatives are rare. Herein, the meta derivative of the frequently used <i>p</i>-H<sub>4</sub>TTFTB ligand, <i>m</i>-H<sub>4</sub>TTFTB, and lanthanide (Ln) metal ions (Tb<sup>3+</sup>, Er<sup>3+</sup>, and Gd<sup>3+</sup>) were assembled into three novel MOFs. Compared with the reported porous Ln-TTFTB, the resulted three-dimensional frameworks, Ln-<i>m</i>-TTFTB ([Ln<sub>2</sub>(<i>m</i>-TTFTB)(<i>m</i>-H<sub>2</sub>TTFTB)<sub>0.5</sub>(HCOO)(DMF)]·2DMF·3H<sub>2</sub>O), possess a more dense stacking which leads to scarce porosity. The solid-state cyclic voltammetry studies revealed that these MOFs show similar redox activity with two reversible one-electron processes at 0.21 and 0.48 V (vs. Fc/Fc<sup>+</sup>). The results of magnetic properties suggested Dy-<i>m</i>-TTFTB and Er-<i>m</i>-TTFTB exhibit slow relaxation of the magnetization. Porosity was not found in these materials, which is probably due to the meta-configuration of the <i>m</i>-TTFTB ligand that seems to hinder the formation of pores. However, the <i>m</i>-TTFTB ligand has shown to be promising to construct redox-active or electrically conductive MOFs in future work.