376356-61-5

Upstream product

• 159-66-0 9,9'-spirobifluorene 
• 622011-36-3 2,2',7,7'-tetranitro-9,9'-spirobi[9H-fluorene] 

Relevant academic research and scientific papers

Organic sol-gel synthesis of microporous molecular networks containing spirobifluorene and tetraphenylmethane nodes

The microporous molecular networks based on rigid tetrafunctional units are synthesized via organic sol-gel polymerization of 2,2′,7,7′- tetraamino-9,9′-spirobifluorene (TASBF) and/or tetrakis(4-aminophenyl) methane (TAPM) with a diisocyanate, hexamethylene diisocyanate (HDI), or p-phenylene diisocyanate. This study is performed as an extension of our previous report on the first organic sol-gel method, which enabled the synthesis of microporous molecular networks via a two-stage mechanism involving the formation of colloidal dispersions of the nanoparticulate molecular networks and their subsequent growth to monolithic networks on solvent evaporation. The sol-gel-synthesized molecular networks obtained by incorporating TASBF as a network former show improved porosity, processability, and thermal stability than the TAPM-based system. The improved porosity of TASBF-based networks is attributed to higher rigidity of the spirobifluorene compared with the tetraphenylmethane units. We also demonstrate the synthesis of mixed organic molecular networks by sol-gel copolymerization of the two network formers, TASBF and TAPM, and a diisocyanate monomer. The sol-gel transformation of TASBF/TAPM/HDI occurred at longer reaction times with increasing the amount of TASBF in the TASBF/TAPM/HDI mixture. The results indicate that the organic sol-gel method can be further optimized by adjusting various synthesis parameters to create new functional organic molecular network materials.

Molecular Tectonics. Porous Hydrogen-Bonded Networks Built from Derivatives of 9,9'-Spirobifluorene

Molecules with multiple sites that induce strong directional association tend to form open networks with significant volumes available for the inclusion of guests. Such molecules can be conveniently synthesized by grafting diverse sticky sites onto geomet