Novel Pyrene-Based Anionic Metal–Organic Framework\nfor Efficient Organic Dye Elimination

Abstract

A novel\nanionic metal–organic framework, JUC-138, constructed by In­(III)\nand a pyrene-based linker, H₈TIAPy (H₈TIAPy\n= 1,3,6,8-tetrakis­(3,5-isophthalic acid)­pyrene), has been synthesized\nby solvothermal reaction successfully. In JUC-138, only four carbonyl\ngroups in each ligand connect to In³⁺ ions, while the others\nremain uncoordinated. However, each In³⁺ connects to four\ncarbonyl groups in a bidentate chelate style, resulting in the formation\nof 2D square sheets in JUC-138. The 2D sheets interact with adjacent\nlayers through the O–H···O hydrogen bonds between\nthe uncoordinated carboxyl groups, thus generating the whole 3D supramolecular\nstructure of JUC-138. UV–vis tests show the energy gap <i>E</i>_g of JUC-138 is 3.34 eV, indicating the semiconductor\nnature of JUC-138. In addition, JUC-138 shows good photocatalytic\nactivity in Azure B (AB) decolorization and could decompose 90% AB\nwithin 4 h. This photocatalytic property makes JUC-138 promising in\nenvironment governance.