Spectrophotometric Study of α‐Nitroso‐β‐naphthol and its 3,6‐disulphonic acid (nitroso‐R‐Salt)

Abstract

The U. V. and visible absorption spectra of α‐nitroso‐β‐naphthol and nitroso‐R‐salt are recorded in solutions of varying pH. The U. V. bands are assigned to π → π* transition within the aromatic system while the visible bands are assigned to intramolecular charge transfer. The pK of both compounds are determined from spectrophotometric and pH measurements.

Conductometric Studies of Charge Transfer Complexes Interaction of Amino Pyridine with π- Acceptors

“…The oximate may also be viewed as a substituted ortho-quinone. Quinones are well known CT acceptors [43,44], but oximates have also donor properties [45]( scheme 3).…”

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“…The oximate may also be viewed as a substituted ortho-quinone. Quinones are well known CT acceptors [43,44], but oximates have also donor properties [45]( scheme 3).…”

Molecular aggregation, solvato- and acidochromic properties of symmetrical ketocyanines

“…Protonation constants of the investigated ketocyanines in the ground state have been determined by two methods, half-height method (HHM) 22 and limiting absorbance methods (LAM). 23 From the inflection point of the spectrophotometric titration curves, the ground state pK a -values were determined and listed in table 5 together with spectral maxima of different species. Protonation constants of the investigated ketocyanines in the first singlet excited state pK * a are determined by using Forster cycle.…”