Transformation of a Hydrazone-Linked Covalent Organic Framework into a Highly Stable Hydrazide-Linked One
Yixuan Yang, Xihao Tang, Shuanghao Wu, Zhao-Yi Dong, Yilun Yan, Sheng‐Run Zheng, Jun Fan, Xinle Li, Song‐Liang Cai, Wei‐Guang Zhang
Abstract
The development of covalent organic frameworks (COFs) with advanced linkages and exceptional chemical stability is of importance but remains a challenge. Herein, a hydrazone-linked COF (hydrazone-MTH-TFPB COF) was converted through mild oxidation into a hydrazide-linked one (hydrazide-MTH-TFPB COF). The hydrazide-linked COF exhibited high crystallinity, permanent porosity, and superb chemical stability in boiling water, strong acid, and strong base conditions. Moreover, hydrazide-MTH-TFPB COF displayed superior iodine uptake relative to hydrazone-MTH-TFPB COF, presumably due to the favorable interaction between iodine molecules and hydrazide moieties in the oxidized COF. This work delineates a facile approach for accessing hydrazide-linked COFs that are otherwise difficult to crystallize de novo.