一种具有高比表面积的 4,4-桨式连接 NbO 型金属有机骨架，具有较大的气体吸附容量。

A highly porous 4,4-paddlewheel-connected NbO-type metal-organic framework with a large gas-uptake capacity.

机构信息

Key Laboratory of Theoretical Chemistry and Molecular Simulation of Ministry of Education, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, People's Republic of China.

出版信息

Dalton Trans. 2013 Aug 21;42(31):11304-11. doi: 10.1039/c3dt50704a.

DOI:10.1039/c3dt50704a

PMID:23817963

Abstract

A highly porous 4,4-paddlewheel-connected NbO-type metal-organic framework (HNUST-2, HNUST represents Hunan University of Science and Technology) has been designed and synthesized by self-assembling [Cu₂(COO)₄] SBUs with a nanosized tetracarboxylate ligand prolonged by alkyne groups, 5,5'-(naphthalene-1,4-diylbis(ethyne-2,1-diyl))diisophthalic acid (H₄NDED). HNUST-2 exhibits high structural stability, a porous non-interpenetration framework with open metal sites and excellent gas-uptake capacity. This MOF material possesses a high BET surface area of 2366 m² g⁻¹, a large unsaturated excess and total H₂ uptake of 4.57 wt% and 5. 20 wt% at 20 bar and 77 K, respectively. Meanwhile, HNUST-2 also exhibits an excellent adsorption capacity for CO₂ (18.07 mmol g⁻¹ at 20 bar and 298 K) and CH₄ (85.6 cm³ cm⁻³ at 20 bar and 298 K) with a high selectivity for CO₂ over N₂ (22.9) and CH₄ (4.9) at 298 K.

摘要

由具有纳米尺寸的四羧酸配体萘-1,4-二基双（乙炔-2,1-二基）二异酞酸（H₄NDED）与[Cu₂（COO）₄] SBUs 自组装而成的高度多孔 4,4-桨轮连接的 NbO 型金属有机骨架（HNUST-2，HNUST 代表湖南科技大学）已被设计和合成。HNUST-2 表现出高结构稳定性、具有开放金属位点的多孔非贯穿骨架和优异的气体吸附能力。这种 MOF 材料具有 2366 m² g⁻¹ 的高 BET 表面积、4.57 wt%的大不饱和过剩和总 H₂吸附量，分别在 20 巴和 77 K 下，5.20 wt%。同时，HNUST-2 对 CO₂（在 20 巴和 298 K 下为 18.07 mmol g⁻¹）和 CH₄（在 20 巴和 298 K 下为 85.6 cm³ cm⁻³）具有优异的吸附能力，在 298 K 时对 CO₂（22.9）和 CH₄（4.9）具有高选择性。