Computed Properties of C31H20O8《Electrochemically active polyimides containing hydroxyl-functionalized triphenylmethane as molecular sensors for fluoride anion detection》 was published in 2020. The authors were Chiriac, Adriana-Petronela;Butnaru, Irina;Damaceanu, Mariana-Dana, and the article was included in《Electrochimica Acta》. The author mentioned the following in the article:
In the challenging pursuit of endowing the high performance polyimide systems with efficient responsive side chains, the authors have designed and synthesized four mol. sensors containing OH group grafted on triphenylmethane (TPM) core as receptor for the fluoride anion. The sensing platforms were obtained by solution polycondensation reaction of a new TPM-based diamine bearing the OH receptor with four ether-dianhydrides containing different substituents, such as 9,9-diphenyl-fluorene, cyclohexane, isopropylidene or hexafluoroisopropylidene. These structural elements are meant to increase the flexibility of the polyimide backbones, as well as solubility and processing ability from easy accessible solvents, while preserving a high thermal stability. Since TPM-OH based polyimides were not studied yet with regard to their photooptical and electrochem. features, the authors have performed a systematic study which highlighted a complex behavior in strong dependence on the surrounding environment. The UV-visible absorption and fluorescence spectra evidenced the occurrence of solute-solvent interactions which are responsible for unusual pink color of these polyimides. Meanwhile, intermol. H bonding evolved in solid state. These features promoted a redox behavior contingent on the polyimides ability to generate the keto tautomer. For the 1st time in the case of polyimides, spectroscopic and electrochem. responses to fluoride anion were thoroughly analyzed by fluorescence and cyclic voltammetry, besides the already known UV-visible and 1H NMR spectroscopies. Clear changes occurred in the presence of the fluoride anion (with tetrabuthylammonium as the counterion), allowing the authors to discriminate it by other anions. The sensing recognition capability was demonstrated by color change from pink to yellow, fluorescence enhancement and variation from blue to yellowish-green, disappearance of the OH proton signature and easier oxidation in the presence of fluoride anions. Since the acid CH group of TPM core is indirectly entangled in the sensing mechanism of the fluoride anion, different concurrent recognition principles may be considered. Even complex, the sensing behavior of the understudy polyimides proved that a single OH group/monomeric TPM unit is appropriate for efficient fluoride anion recognition.5,5′-((Propane-2,2-diylbis(4,1-phenylene))bis(oxy))bis(isobenzofuran-1,3-dione) (cas: 38103-06-9) were involved in the experimental procedure.
5,5′-((Propane-2,2-diylbis(4,1-phenylene))bis(oxy))bis(isobenzofuran-1,3-dione)(cas: 38103-06-9) is a diallyl based epoxy modification agent that blends with the resin to improve the mechanical property of the epoxy material.Computed Properties of C31H20O8 It is majorly used in novalac based resins, which can be further cured with bismaleimides (BMI) for aerospace, electronics and wireless communication based applications.
Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem