posted on 2021-11-29, 17:04authored byZonglong Li, Li Sheng, Chouhung Hsueh, Xiaolin Wang, Hao Cui, Hongqiang Gao, Yanzhou Wu, Jianlong Wang, Yaping Tang, Hong Xu, Xiangming He
Three-dimensional
(3D) covalent organic frameworks (COFs) are a
new type of crystalline organic porous material, which have great
application potential in various fields due to their complex pore
structures and fully exposed active sites. The synthesis of 3D COFs
with novel topologies is still challenging on account of limited secondary
building units. Herein, we report a 3D COF with hea topology,
which has never been reported before, utilizing a D3h-symmetric precursor [2,3,6,7,14,15-hexakis(4-formylphenyl)triptycene
(HFPTP)] and [tetrakis(4-amino biphenyl)methane (TABPM)]. 3D-hea-COFs
display permanent porosity and a Brunauer–Emmett–Teller
surface area of 1804.0 m2 g–1. Owing
to the huge internal free volume of triptycene, 3D-hea-COFs show good
adsorption performance for H2, CO2, and CH4. Moreover, theoretical calculation reveals that both triptycene
and tetraphenylmethane units contribute to enhance hydrogen storage
capacity. The novel topology in this work expands the family of 3D
COFs and provides new possibilities for designing efficient gas storage
materials.