Optical Spectra of Phenazine, 5,10-Dihydrophenazine, and the Phenazhydrins

Abstract

The optical properties of phenazine, 5,10-dihydrophenazine, 1: 1 phenazhydrin, and 3: 1 phenazhydrin have been investigated, and ir, uv, and diffuse reflectance spectra are reported. The ir data indicate that the structures of the phenazhydrins resemble those of the parent compounds. The uv spectrum of 5,10-dihydrophenazine has a Λmax at 350 nm, which is not in agreement with a previously reported value of 325 nm. Absorption spectra of the reduced phenazine were also obtained via diffuse reflectance and a subtraction technique. Absorption in the visible region which is not present in the solution spectra is observed in the diffuse reflectance spectra of the phenazhydrins. The optical spectra of the four related compounds are collectively presented and discussed.

Characterization of Reaction Intermediate Aggregates in Aniline Oxidative Polymerization at Low Proton Concentration

“…55 In addition, when phenazine is mixed with dihydrophenazine, phenazhydrins form, which absorb similarly to phenazine. 56 This electronic absorption is due to π f π* transitions. Substitution to the benzene rings on the phenazine structure does not strongly affect the absorption.…”

Preparation of Pt-Catalyst by Poly(p-phenylenediamine) Nanocomposites Assisted by Microwave Radiation for Proton Exchange Membrane Fuel Cell

“…The proton by-products of the redox reaction were immediately neutralized by the present NaOH (pH = 11) to inhibit the reverse reaction according to Scheme 1 and the yield of Pt elements can be enhanced. The peak of 5,10-dihydrophenazine (dihydrophenazine) assigned at 1612 cm −1 (stretching vibration of conjugated C=C of benzene ring) [30,31] were found for all samples demonstrated in Figure 1. They can be created by the intramolecular oxidation between the amino groups and the neighboring aromatic H– during either oxidative polymerization or MW irradiation.…”

Isolation and structural identification of two bioactive phenazines from Streptomyces griseoluteus P510

“…substituents on the heterocyclic ring [21]. According to the absorption spectra of phenazines, peaks are at 207, 251, and 364 nm in the absorption spectrum of Compound 1 dissolved in methanol ( Fig.…”