Physico-chemical properties of isomeric forms of luminol in aqueous solutions

Two luminol isomers, 2,4-diaminoisoindoline-1,3-dione and 8-amino-4-hydroxyphthalazin-1(2H)-one, have been obtained and described, their physical and chemical properties studied. Using UV-spectroscopy and fluorescence data, it has been shown that, in aqueous solutions, 2,4-diaminoisoindoline-1,3-dio...

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Bibliographic Details
Published in:Journal of molecular structure 2018-02, Vol.1154, p.59-63
Main Authors: Skripnikova, Tatiana A., Lysova, Svetlana S., Zevatskii, Yuriy E., Myznikov, Leonid V., Vorona, Svetlana V., Artamonova, Tatiana V.
Format: Article
Language:English
Subjects:
Fluorescence
Luminol isomers
Thermodynamic dissociation constant
UV–Vis absorption spectrophotometry
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Summary:Two luminol isomers, 2,4-diaminoisoindoline-1,3-dione and 8-amino-4-hydroxyphthalazin-1(2H)-one, have been obtained and described, their physical and chemical properties studied. Using UV-spectroscopy and fluorescence data, it has been shown that, in aqueous solutions, 2,4-diaminoisoindoline-1,3-dione isomerize into 8-amino-4-hydroxyphthalazin-1(2H)-one, with the speed of transition depending on the pH values. Thermodynamic dissociation constants for the 2,4-diaminoisoindoline-1,3-dione and 8-amino-4-hydroxyphthalazin-1(2H)-one luminol isomers have been determined. [Display omitted] •The structure of luminol isomers II, III has been detailed.•III passes into II, the speed depending on the pH.•Only II is fluorescent.•pKT for luminol isomers II, III have been obtained.
ISSN:0022-2860
1872-8014
DOI:10.1016/j.molstruc.2017.10.004