Three new pairs of 2-fold interpenetrated and self-entangled three-dimensional isostructural porous metal-organic frameworks (MOFs), [Zn(L1)(x)]·0.5HO (x = bipy for , bpa for , and bpe for ) and [Zn(L2)(x)]·0.5HO (x = bipy for , bpa for , and bpe for ) [bipy = 4,4'-bipyridine, bpa = 1,2-bis(4-pyridyl)ethylene, and bpe = 1,2-bis(4-pyridyl)ethylene], have been created and fine-tuned via similar skeleton ligands 2-(imidazol-1-yl)terephthalic acid (HL1) and 2-(1-1,2,4-triazol-1-yl)terephthalic acid (HL2) and N-auxiliary coligands with different linking groups. Interestingly, the porosities of the MOFs can be effectively increased via the insertion of -CHCH- or -CH═CH- spacers into the N-auxiliary bipy ligand. As a result, complexes and displayed highly enhanced CO uptake capacities. Furthermore, complex also had a higher C/C selectivity as well as great CO cycloaddition efficiency.
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