New pyridocarbazole quinonoid-type colour formers that can immediately produce intense absorption bands in the near-IR region on simultaneous metal chelate complexation-oxidation processes are synthesised.
K. Yoshida, N. Oga, M. Kadota, Y. Ogasahara and Y. Kubo, J. Chem. Soc., Chem. Commun., 1992, 1114 DOI: 10.1039/C39920001114
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