Abstract
A robust binary hydrogen-bonded supramolecular organic framework (SOF-7) has been synthesized by solvothermal reaction of 1,4-bis-(4-(3,5-dicyano-2,6-dipyridyl)dihydropyridyl)benzene (1) and 5,5′-bis-(azanediyl)-oxalyl-diisophthalic acid (2). Single crystal X-ray diffraction analysis shows that SOF-7 comprises 2 and 1,4-bis-(4-(3,5-dicyano-2,6-dipyridyl)pyridyl)benzene (3); the latter formed in situ from the oxidative dehydrogenation of 1. SOF-7 shows a three-dimensional four-fold interpenetrated structure with complementary O–H···N hydrogen bonds to form channels that are decorated with cyano and amide groups. SOF-7 exhibits excellent thermal stability and solvent and moisture durability as well as permanent porosity. The activated desolvated material SOF-7a shows high CO2 adsorption capacity and selectivity compared with other porous organic materials assembled solely through hydrogen bonding.
Highlights
Porous framework materials, such as porous carbon,[1] zeolites,[2] metal−organic frameworks,[3] and porous organic frameworks,[4−7] have attracted intensive research interest due to their potential applications in molecular storage and separation
Porous organic framework materials have become competitive materials because of their low framework density resulting from the use of light elements and their low toxicity as well as their controllable assembly through organic synthesis and crystal engineering.[4−7] For example, covalent organic frameworks (COFs)[6] or porous organic polymers (POPs) and polymers of intrinsic microporosity (PIMs) represent[7] a widely investigated family of porous organic materials that are typically prepared from organic coupling reactions of selected and/or designed precursors
The development of COFs/POPs/PIMs has been somewhat restricted by harsh reaction conditions, multistep syntheses, and the involvement of relatively expensive catalysts
Summary
Porous framework materials, such as porous carbon,[1] zeolites,[2] metal−organic frameworks,[3] and porous organic frameworks,[4−7] have attracted intensive research interest due to their potential applications in molecular storage and separation. Schematic View of the Organic Modules interest in SOF materials comes from the soft and flexible nature of their molecular interactions, the ease of manipulation of the modularity and functionality of the organic components, and the tunable guest selectivity achieved by decorating the pores with organic groups that can exploit specific interactions with different gas molecules. SOF materials have been reported in which a single type of organic molecule crystallizes into a porous phase via supramolecular hydrogen-bonding interactions5a−f in which the resultant porous phase depends greatly on the solvents present.
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