Charge Control in Two Isostructural Anionic/Cationic CoIICoordination Frameworks for Enhanced Acetylene Capture.
Two isostructural CoII-based metal-organic frameworks (MOFs) with the opposite framework charges have been constructed, which can be simply controlled by changing the tetrazolyl or triazolyl terminal in two bifunctional ligands. Notably, the cationic MOF 2 can adsorb much more C2H2than the anionic MOF 1 with an increase of 88 % for C2H2uptake at 298 K in spite of more active nitrogen sites in 1. Theoretical calculations indicate that both nitrate and triazolyl play vital roles in C2H2binding and the C2H2adsorption isotherm confirms that the enhanced C2H2uptake for 2 (225 and 163 cm3g-1at 273 and 298 K) is exceptionally high for MOF materials without open metal sites or uncoordinated polar atom groups on the frameworks.
Henan Provincial Key Laboratory of Surface & Interface Science, Zhengzhou University of Light Industry, Zhengzhou, 450002, China.
Di-Ming
DM
Chen
Henan Provincial Key Laboratory of Surface & Interface Science, Zhengzhou University of Light Industry, Zhengzhou, 450002, China.
Jia-Yue
JY
Tian
Henan Provincial Key Laboratory of Surface & Interface Science, Zhengzhou University of Light Industry, Zhengzhou, 450002, China. chunsenliu@zzuli.edu.cn.
Chun-Sen
CS
Liu
Henan Provincial Key Laboratory of Surface & Interface Science, Zhengzhou University of Light Industry, Zhengzhou, 450002, China.
Min
M
Chen
Henan Provincial Key Laboratory of Surface & Interface Science, Zhengzhou University of Light Industry, Zhengzhou, 450002, China. dumiao@public.tpt.tj.cn.
Miao
http://orcid.org/0000-0001-5491-9467
M
Du
acetylene storage; bifunctional ligand; charge control; metal-organic frameworks; sorption mechanism