Chen, Qi published the artcileSpiro(fluorene-9,9′-xanthene)-Based Porous Organic Polymers: Preparation, Porosity, and Exceptional Hydrogen Uptake at Low Pressure, Name: Spiro[fluorene-9,9′-xanthene], the publication is Macromolecules (Washington, DC, United States) (2011), 44(20), 7987-7993, database is CAplus.
Preparation and sorption properties of spiro(fluorene-9,9′-xanthene)-based porous organic polymers (SPOPs) are reported. Using a same linker monomer, the micropore size and sp. surface area in SPOPs are tunable by variation of the structure of core building blocks. According to the obtained nitrogen physisorption isotherms, the Brunauer-Emmett-Teller sp. surface area for these polymers varies between 750 and 1020 m2/g. Copolymer SPOP-3 containing spiro(fluorene-9,9′-xanthene) and spirobifluorene with 1:1 ratio, prepared by Suzuki coupling polymerization, possesses 2.22 weight% hydrogen adsorption capacity at 1.0 bar and 77 K, which not only is the exceptional uptake capacity for hydrogen at low pressure among the best reported results for organic polymers but also can be competitive with other kinds of porous materials such as activated carbons and metal-organic frameworks.
Macromolecules (Washington, DC, United States) published new progress about 159-62-6. 159-62-6 belongs to naphthyridine, auxiliary class Other Aromatic Heterocyclic,Spiro, name is Spiro[fluorene-9,9′-xanthene], and the molecular formula is C25H16O, Name: Spiro[fluorene-9,9′-xanthene].
Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem