大体积溶剂中的孔隙率可以通过分散和溶解多孔主体的方法或通过它们的化学装饰来产生。随后的带有空腔的液体提供了必要的高气体吸收。有趣的是，金属有机笼（MOCs）作为离散的纳米多孔主体最近已被用作可溶性实体，以获得一系列有趣的II型多孔液体（PL）。然而，影响II型PL制造的因素尚未披露。在这里，三个金属（NUT-101，ZrT-1-NH2和ZrT-1）具有相同的锆茂节点，但不同的有机配体被选择作为多孔主体和聚乙二醇（PEG）连接的双咪唑基IL，IL(NTf2),用作大体积溶剂。首次揭示了II型PL的产生取决于MOCs的灵活性以及MOCs与溶剂分子之间的相互作用。用NUT-101(5%)在IL(NTf2)中观察到最大溶解度,而ZrT-1-NH2和ZrT-1保持最低溶解度(0.5%和0.2%)。因此,具有大多数内在空腔的PL-NUT-101-5％显示出比PL-ZrT-1-NH2-0.5％和PL-ZrT-1-0.2％更高的CO2吸收（0.576mmolg-1）以及那些报道的II型PL。
Porosity in bulky solvents can be created by the methods of dispersing and dissolving porous hosts or by their chemical adornment. And the ensuing liquids with cavities offer requisite high gas uptakes. Intriguingly, metal-organic cages (MOCs) as discrete nanoporous hosts have been utilized recently as soluble entities to obtain a series of interesting type II porous liquids (PLs). Yet, factors affecting the fabrication of type II PLs have not been disclosed. Herein, three metallocages (NUT-101, ZrT-1-NH2, and ZrT-1) with the same zirconocene nodes but different organic ligands are chosen as porous hosts and a polyethylene-glycol (PEG) linked bis-imidazolium based IL, IL(NTf2), is used as a bulky solvent. It is revealed for the first time that the generation of type II PL depends upon the flexibility of MOCs and the interaction between MOCs and solvent molecules. The maximum solubility is observed with NUT-101 (5%) in IL(NTf2) while ZrT-1-NH2 and ZrT-1 remain least soluble (0.5% and 0.2%). As a result, PL-NUT-101-5% with most intrinsic cavities shows higher CO2 uptake (0.576 mmol g-1) than PL-ZrT-1-NH2-0.5% and PL-ZrT-1-0.2% as well as those reported type II PLs.
