Über Mono‐, Di‐ und Triarylamin‐Radikalkationen

Abstract

Die Mono- (1–10), Di- (11–30) und Triarylamin-Radikalkationen (31–35) wurden durch Oxidation der entsprechenden Amine mit Bleitetraacetat erzeugt und ESR-spektroskopisch, stationär oder im Durchfluß, untersucht. Der Einfluß von p-Substituenten auf die ESR- und UV-Daten der Grundkörper 1, 11 und 31 wird diskutiert

Synthesis, (Non)Linear Optical and Redox Properties of a Donor-Substituted Truxenone Derivative

“…Upon oxidation of 7 to 7 3 a very intense band appears at 775 nm, characteristic of triarylamine radical cations. [26] At the same time, the CT band at 508 nm decreases (Figure 3a). A similar effect is observed during reduction of 7 to 7 À (Figure 3b): here again, the CT band at 508 decreases and new bands at 436 and at 690 nm appear.…”

One- and Two-Dimensional Electron Transfer Processes in Triarylamines with Multiple Redox Centers

“…This proves that the IV-CT band is solely associated with 2 . Spectroelectrochemistry of 3 also revealed, besides a radical band at 748 nm, [11] an IV-CT band of low intensity (in the order of 5000 m -1 cm…”

“…The twofold photocyclization in the presence of methyloxirane with iodine as an oxidating agent [10] yielded the bridged [6]helicenes 8 a and 8 b. [11] In 7 c the short polymethylenedioxy chain did not permit the formation of the corresponding helicene.…”

“…This reversible oxidation process was calibrated by thin-layer coulometry with 2,5-bis(dicyanovinyl)furan as the reference, and it involves six electrons in total, leading to 3 6 . UV/Vis/NIR spectroelectrochemical investigation [10] of 2 shows that besides a band at 734 nm, which is characteristic for triarylamine radical cations, [11] a second very intense band 10 mm ethylenediamine tetraacetate (EDTA), 1 mm 1,4-dithiothreitol (DTT), and 1 % bovine serum albumen (BSA) at 4 8C in a volume of 400 mL. After 30 minutes this exchange reaction was stopped by the addition of MgCl 2 to give a final concentration of 25 mm and the enzyme´substrate (E´S) complex purified on a PD10 column.…”

Comment on “Synthesis, Characterization, and Structures of a Persistent Aniline Radical Cation”: A New Interpretation Is Necessary

“…Such a bond length could not be reproduced by ab initio and density functional theory (DFT) quantum-chemical calculations of the isolated TBAC + molecule. Only when two SbF 6 À anions were incorporated in the computations did an ab initio (MP2) method predict a similarly long C À N bond of 1.498 . Most remarkably, with increasing temperature the X-ray data indicated a dramatic, reversible change of the geometry of the phenyl ring of TBAC + .…”