A (3,8)-connected metal–organic framework with a unique binuclear [Ni2(μ2-OH)(COO)2] node for high H2 and CO2 adsorption capacities

Abstract

A rare binuclear [Ni₂(μ₂-OH)(COO)₂]-based nickel–organic framework (1) composed of close-packed irregular octahedral cages possesses a new (3,8)-connected topology with the Schläfli symbol of (3·5²)₂(3⁴·4²·5⁶·6¹¹·7⁴·8). At 1.0 bar, this activated sample (1a) exhibits a considerably high H₂ uptake of 203.2 cm³ g⁻¹ (1.81 wt%) at 77 K, and a high CO₂ uptake of 108.2 cm³ g⁻¹ (21.3 wt%) at 273 K. In addition, 1a has good adsorption selectivity for CO₂ over CH₄ and N₂.