Scheme 1
From: A cautionary tale of basic azo photoswitching in dichloromethane finally explained

Isomerization of 4-phenylazopyridine (AzPy) with light or heat.
From: A cautionary tale of basic azo photoswitching in dichloromethane finally explained

Isomerization of 4-phenylazopyridine (AzPy) with light or heat.