Crystalline Covalent Organic Frameworks

Covalent organic frameworks (COFs Sect. 3.1) 711-4,210 0.32-1.66" High thermeil stability porosity sensitive to air for B-conteiining COFs Highest MOP surface areas crystalline tunable pores [14, 20, 67]... 

C6t6 AP, Benin AI, Ockwig NW, O Keeffe M, Matzger AJ, Yaghi OM (2005) Porous, crystalline, covalent organic frameworks. Science 310 1166-1170... 

Chen X, Addicoat MA, Irle S et til (2012) Control crystallinity and porosity of covalent organic frameworks through managing interlayer interactions based on self-complementary jt-electronic force. J Am Chem Soc 135 546-549... 

Porous organic frameworks (POFs), such as metal-organic frameworks (MOFs), covalent organic frameworks (COFs), conjugated micro-porous polymers (CMPs), ° polymers of intrinsic microporosity (PIMs), crystalline triazine-based organic frameworks (CTFs), hyper-crosslinked... 

The presence of water vapour will define which materials can be used based on their hydrolytic stability. As an example metal-organic frameworks (MOFs) and covalent organic framework (COFs) are crystalline microporous materials which can exhibit exceptionally high surface areas and gas sorption capacities and, as such, have been proposed as potential materials for CCS. However, some of these materials can be unstable in the presence of moisture. The IRMOF series and the more recently produced COF materials are particularly unstable (e.g., loss of porosity at room temperature in air). Clearly, materials of this type would be unsuitable for CCS application. If such materials are to be used, more stable types are required for example, one class of MOF known as zeolitic imidazole frameworks (ZIFs) are reported to have greatly improved hydrolytic stability. 

In Chapter 6, B. M. Rombo et al. delve into the formation of boronate-linked supramolecular architectures based on boronate ester formation—for example, small molecule diesters form supramolecular self-assemblies in the solid state based on a phenyl-boron-phenyl sandwich motif in which these small oligomers link together to generate macrocycles and other polymers. The polymeric macrocyclics and linear structures demonstrate self-repair capabilities and constitute a new class of wide band-gap semiconducting materials. Through the incorporation of polyvalent boronates, covalent organic frameworks are described, which create highly crystalline, porous network materials. 

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