Abstract
Abstract A shift of the K band in the spectrum of monosubstituted benzene C6H5-X may by to some extent considered a measure of the electron donor or acceptor strength of the X substituent1. However, it should be emphasized that the knowledge of only Δλexp.H,X value does not allow to determine the spectral nature of a certain unknown X substituent since the bathochromic shift of the K band occurs both - when this substituent is auxochromic /electron donor/ or when it is anti-auxochromic /electron acceptor/.
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