A new synthetic methodology based on the self-condensation of 1,2,3-benzodithiazolyl diradicals (Herz radicals) provided otherwise hardly accessible 5-6-6-6-5 and 5-6-7-6-5 pentacyclic sulfur-nitrogen near-IR dyes featuring up to five multiple long-lived and differently coloured redox-states.
The article was received on 02 Nov 2019, accepted on 02 Dec 2019 and first published on 04 Dec 2019
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