Chemistry of Herz radicals: a new way to near-IR dyes with multiple long-lived and differently-coloured redox states†‡
Alexander Yu.
Makarov, 
a
Yulia M.
Volkova,
a
Leonid A.
Shundrin,
*ab
Alexey A.
Dmitriev,
cd
Irina G.
Irtegova,
a
Irina Yu.
Bagryanskaya,
ab
Inna K.
Shundrina,
a
Nina P.
Gritsan,
*cd
Jens
Beckmann
*e
and
Andrey V.
Zibarev
*af
a
Yulia M.
Volkova,
a
Leonid A.
Shundrin,
*ab
Alexey A.
Dmitriev,
cd
Irina G.
Irtegova,
a
Irina Yu.
Bagryanskaya,
ab
Inna K.
Shundrina,
a
Nina P.
Gritsan,
*cd
Jens
Beckmann
*e
and
Andrey V.
Zibarev
*af
Abstract
A new synthetic methodology based on the self-condensation of 1,2,3-benzodithiazolyl diradicals (Herz radicals) produces unprecedented 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.
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