- A borinic acid polymer with fluoride ion- and thermo-responsive properties that are tunable over a wide temperature range
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A new type of smart borinic acid polymer with luminescence and multiple stimuli-responsive properties is reported. In DMSO with small amounts of water, the homopolymer PBA shows a tunable upper critical solution temperature (UCST). As the amount of water increases from 0 to 2.5% (v/v), the UCST rises linearly from 20C to 100C (boiling point of water). Thus, the thermal responsive behavior can be tuned over a wide temperature range. Furthermore, polymer solutions in DMSO show a reversible response to fluoride ions, which can be correlated to the presence of the Lewis acidic borinic acid groups. Upon addition of fluoride, the polymer becomes soluble because the functional R2BOH groups are converted into ionic [R2BF2]- groups, but turns insoluble again upon addition of H2O, which reverses this process.
- Wan, Wen-Ming,Cheng, Fei,Jaekle, Frieder
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- Two derivatives of phenylpyridyl-fused boroles with contrasting electronic properties: Decreasing and enhancing the electron accepting ability
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Two derivatives of phenylpyridyl-fused boroles were prepared via functionalization of the pyridyl groups, namely to an electron-rich dihydropyridine moiety (compound 1) and an electron-deficient N-methylpyridinium cation (compound 2). Due to strong conjugation between the dihydropyridine moiety and the boron atom, the reduction potential of compound 1 shifts cathodically. In contrast, compound 2 exhibits three reduction processes with a first reversible reduction potential anodically shifted in comparison to its precursor (TipPBB2) or the non-borylated framework 1-methyl-2-phenylpyridin-1-ium triflate (3). The significantly anodically shifted reduction potential indicates the extreme electron deficiency of compound 2, which also leads to the reversible coordination of THF. Photophysical properties of both compounds in different solvents were investigated. Theoretical studies further support the strong conjugation in the ground state of compound 1 and the electron-deficient property of compound 2.
- He, Jiang,Rauch, Florian,Krummenacher, Ivo,Braunschweig, Holger,Finze, Maik,Marder, Todd B.
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supporting information
p. 355 - 361
(2021/01/11)
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- ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES
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Novel metal complexes incorporating boron-containing aromatic compounds useful as a phosphorescent OLED material are disclosed. The metal complex includes a first ligand LA having the following formula
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Paragraph 0141; 0143
(2020/09/09)
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- Hindered Organoboron Groups in Organic Chemistry. Part 22. Some Interesting Properties of 2,4,6-Triisopropylphenylborane (Tripylborane, TripBH2, A New Useful Monoarylborane
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2,4,6-Triisopropylphenylborane (tripylborane, TripBH2) is a solid, stable, hydroborating agent that hydroborates monosubstituted alkenes to give either TripBHR1 or TripBR12.TripBHR1 can be converted into mixed boranes TripBR1R2 (R1,R2 = primary alkyl, Rp) and TripBRpRs and TripBRs2 are also readily available.Oxidation of these products gives the corresponding alcohols in excellent yields, with a high selectivity for alkan-1-ols in the cases of groups derived from alk-1-enes.Cyanidation of TripBR2 proceeds to give ketones without migration of the aryl group.This establishes the low migratory aptitude of the aryl group and also that no scrambling of alkyl groups occurs.The tripyl group of TripBRp2 can be selectively removed.
- Smith, Keith,Pelter, Andrew,Jin, Zhao
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p. 395 - 396
(2007/10/02)
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