Concerning the ability of oligooxyquinoline to accumulate reversibly bound oxygen

A Chemical Failure Mechanism for Aluminum(III) 8-Hydroxyquinoline Light-Emitting Devices

“…Upon further oxidation of this polymer with basic H 2 O 2 , formation of polymeric N-oxides took place (IR, NfO at 1350 cm -1 ). 20 On the other hand, the electrochemical oxidative coupling of 8-Hq to poly(8-quinolinol ethers) was claimed by Pham et al (IR Ar-O-Ar at 1235 cm -1 ). 18 Polymer III exhibits a number of functionalities based on IR spectroscopy.…”

“…Polymer III exhibits a number of functionalities based on IR spectroscopy. The disappearance of OH stretching along with a strong peak at 1320 cm -1 could be explained by the presence of N -oxides, where intramolecular hydrogen bonding results in the absence of significant absorption above 3100 cm -1 . However, the presence of a weak but clearly discernible carbonyl stretching at 1665 cm -1 may indicate the presence of quinoid moieties as well.…”

“…The disappearance of OH stretching along with a strong peak at 1320 cm -1 could be explained by the presence of N-oxides, where intramolecular hydrogen bonding results in the absence of significant absorption above 3100 cm -1 . 20 However, the presence of a weak but clearly discernible carbonyl stretching at 1665 cm -1 may indicate the presence of quinoid moieties as well. In addition, two medium-weak peaks at 1236 and 1224 cm -1 could also indicate the presence of 8-quinolinol ethers.…”

“… claimed that the oxidative polycondensation of 8-Hq by oxygen in a basic environment gave a polymer coupled at the 5,7 positions (IR O−H at 3320−3600 cm -1 ). Upon further oxidation of this polymer with basic H 2 O 2 , formation of polymeric N -oxides took place (IR, N→O at 1350 cm -1 ) …”