Summary
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1.
The experimental data presented in this paper show that the replacement of -N = N- and therefore other analogous groups, by - NH - in certain conjugated systems does not interrupt the conjugation.
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2.
In the case of arylhydrazones of 9-acrid inecarboxaldehyde this replacement is accompanied by a considerable shift of the maximum of the main absorption band towards the longer waves.
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Kharkharov, A.A. Absorption spectra and molecular structure analogous behavior of azo and imino groups. Russ Chem Bull 3, 95–100 (1954). https://doi.org/10.1007/BF01195429
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DOI: https://doi.org/10.1007/BF01195429