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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

NbCl5 Promoted the Efficient Synthesis of Phthalein Derivatives: Optical Characterization and Solvatochromic Effect

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Author(s):
Moreno, Vitor Fernandes [1] ; dos Santos, Giovanny Carvalho [1] ; Gaspar da Costa, Gyordanna Mayara [1] ; Ayala Gomes, Marcelo Henrique [1] ; da Silva-Filho, Luiz Carlos [1]
Total Authors: 5
Affiliation:
[1] Sao Paulo State Univ UNESP, LOSP, Dept Chem, Sch Sci, BR-17033360 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of Heterocyclic Chemistry; v. 56, n. 10 AUG 2019.
Web of Science Citations: 0
Abstract

Organic dyes derived from phthaleins have a large number of industrial applications and can be synthesized using a Lewis acid by Friedel-Crafts acylation, followed by an addition reaction to the carbonyl compound. This work aims to investigate the use of NbCl5 as a catalyst for the acylation reaction. The behavior of the phthalein derivatives in several solvents and when subjected to different pH conditions was studied. These compounds showed a color-changing effect depending on the pH and solvent, making them useful for applications as indicators. The phthaleins change their conformations depending on the condition of the medium. Photophysical studies of these compounds were carried out through their UV-Vis absorption spectra. Here, we show the umbrella-like conformation change of phthalein derivatives that depend on the solvent and the pH of the medium. (AU)

FAPESP's process: 12/24199-8 - Studies on synthesis of Quinoline derivatives promoted by Niobium Pentachloride, for use as dyes-sensitizers in photoelectrochemical devices of Grätzel
Grantee:Giovanny Carvalho dos Santos
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 16/01599-1 - Studies about the use of NbCl5 in multicomponent reactions for the synthesis of organic dyes
Grantee:Luiz Carlos da Silva Filho
Support Opportunities: Regular Research Grants
FAPESP's process: 15/00615-0 - Studies on the synthesis and photochemical and photophysical characterization of quinoline derivatives with donor-p-acceptor structure for use as sensitizing dyes in organic electronic devices
Grantee:Giovanny Carvalho dos Santos
Support Opportunities: Scholarships in Brazil - Doctorate