Talk:4,4′-Diamino-2,2′-stilbenedisulfonic acid

Optical_brightener says the trans-form absorbs UV (and emits blue) and converts to the optically inactive cis-form. Worth noting if verifiable ? Does that suggest trans- or cis- is more stable (lower energy) ? - Rod57 (talk) 14:14, 17 February 2017 (UTC)[reply]

It would be normal for the trans isomer to be the lower energy, more stable isomer. Absorption of energy would lead to the higher energy cis isomer. -- Ed (Edgar181) 16:05, 17 February 2017 (UTC)[reply]