Die Spaltung von Phenoläthern mit Pyridinhydrochlorid, II. Mitteilung

Prey, V.

doi:10.1002/cber.19420750409

Cited by 42 publications

(10 citation statements)

References 6 publications

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“…However, the dendronized 6‐phenyl‐2,2'‐bipyridine ligands were prepared using a “green” solvent‐free method developed for aldol condensation and Michael addition to give ligand Meppbpy 28–30. After demethylation of Meppbpy by heating with molten pyridinium chloride,31–33 the free phenolic hydroxyl groups were reacted with an appropriate electrophile to give the desired ligands C 10 ppbpy and G1ppbpy (bearing a 1 st generation Fréchet‐type dendron). Details concerning the synthesis and the characterization of these complexes can be found in the experimental section.…”

Section: Resultsmentioning

confidence: 99%

Efficient and Long‐Living Light‐Emitting Electrochemical Cells

Costa

Ortı́

Bolink

et al. 2010

Adv Funct Materials

153

154

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Three new heteroleptic iridium complexes that combine two approaches, one leading to a high stability and the other yielding a high luminescence efficiency, are presented. All complexes contain a phenyl group at the 6‐position of the neutral bpy ligand, which holds an additional, increasingly bulky substituent on the 4‐position. The phenyl group allows for intramolecular π–π stacking, which renders the complex more stable and yields long‐living light‐emitting electrochemical cells (LECs). The additional substituent increases the intersite distance between the cations in the film, reducing the quenching of the excitons, and should improve the efficiency of the LECs. Density functional theory calculations indicate that the three complexes have the desired π–π intramolecular interactions between the pendant phenyl ring of the bpy ligand and the phenyl ring of one of the ppy ligands in the ground and the excited states. The photoluminescence quantum efficiency of concentrated films of the complexes improves with the increasing size of the bulky groups indicating that the adopted strategy for improving the efficiency is successful. Indeed, LEC devices employing these complexes as the primary active component show shorter turn‐on times, higher efficiencies and luminances, and, surprisingly, also demonstrate longer device stabilities.

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Section: Resultsmentioning

confidence: 99%

Efficient and Long‐Living Light‐Emitting Electrochemical Cells

Costa

Ortı́

Bolink

et al. 2010

Adv Funct Materials

153

154

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“…Anhydrous hydrogen chloride has been reported not to split phenolic ethers a t 220°C. (220). Refluxing, concentrated hydrochloric acid is without effect on pyroga.llo1 trimethyl ether even if hydrogen chloride gas is passed through the system (144).…”

Section: Further Descriptive Chemistry Of Cleavage By Hydrogen Hamentioning

confidence: 99%

“…(279). Pyridine hydrohalides are probably the materials of choice (219,220,221,222), although it has been reported that, in the cleavage of methyl 0-naphthyl ether, quinoline hydroiodide is better than the pyridine analog. Surprisingly, aniline hydroiodide is reported to be ineffective even at 250-270°C.…”

Section: G Cleavage By Amine Saltsmentioning

confidence: 99%

Cleavage of Ethers

1983

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“…Anhydrous hydrogen chloride has been reported not to split phenolic ethers at 220°C. (220). Refluxing, concentrated hydrochloric acid is without effect on pyrogallol trimethyl ether even if hydrogen chloride gas is passed through the system (144).…”

Section: Further Descriptive Chemistry Of Cleavage By Hydrogen Halidesmentioning

confidence: 99%