Unusual features in the triplet state EPR spectrum of 3,5-dichloro-4-aminophenyl cation

Add time:08/12/2019    Source:sciencedirect.com

The triplet ground state of the 3,5-dichloro-aminophenyl cation (3Ar+), generated by photolysis at 77 K of the parent arenediazonium salt, exhibits the strongest dipolar interaction in its EPR spectrum (D>0.3 cm−1) found so far for any known aryl cation. It also shows highenergy site splitting, as detected by EPR for several other cations, producing two distinct forms (type A with D = 0.3066 cm−1 and type B with D = 0.3410 cm−1). 3Ar+ and certain other aryl cations also show electronic absorption spectra composed of two or three distinct bands.

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