Effect of Linker Substituent on Structure, Stability, and Sorption Properties of Zn-isophthalate/acylhydrazone Networks

The effect of linker substituents on the structure, stability, and gas adsorption properties in a series of related metal-organic frameworks is investigated using a combination of X-ray, IR, thermogravimetric, and gas adsorption methods.

Introduction

Metal-organic frameworks (MOFs), also known as porous coordination polymers (PCPs), have attracted significant scientific interest in recent years. This is mainly due to their remarkable properties which include high internal surface areas, extensive crystal engineering possibilities, as well as unique and extremely versatile structural flexibility and responsivity. These properties mean that they have wide ranging potential applications in fields such modern industry, gas storage and separation, catalysis and many more.

Current environmental pressures mean that porous materials for gas capture and separation are in high demand. MOFs, which have a high external surface often in combination with selective adsorption of CO2, are attractive materials for the adsorption and separation of CO2 from exhaust gases. Alongside their chemical affinity towards CO2, any potential material must also be chemically and thermally stable. These qualities have been shown in the cases of some MOFs, however more detailed studies are needed for a deeper understanding of the interplay between structure and properties such as stability and selectivity amongst others.

The synthesis, crystal structure, CO2 and N2 sorption properties, and thermal and hydrolytic stability of a series of new mixed-linker MOFs are presented here. The studied frameworks consist of the same neutral pcih (4-pyridinecarbaldehyde isonicotinol hydrazine) linker belonging to a class of acylhydrazones, which possess C═O and N─H functional groups.

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