Spiroindeno-pyridineindoles (SIPIs) as new visible colorimetric pH indicators

Ghodsi Mohammadi Ziarani; Maedeh Bagheri; Shahriar Bahar; Alireza Badiei; Jahan B Ghasemi; Fatemeh Karimi

doi:10.1016/j.chemosphere.2022.135630

Spiroindeno-pyridineindoles (SIPIs) as new visible colorimetric pH indicators

Chemosphere. 2022 Nov:306:135630. doi: 10.1016/j.chemosphere.2022.135630. Epub 2022 Jul 6.

Authors

Ghodsi Mohammadi Ziarani¹, Maedeh Bagheri², Shahriar Bahar², Alireza Badiei³, Jahan B Ghasemi³, Fatemeh Karimi⁴

Affiliations

¹ Department of Chemistry, Faculty of Physics and Chemistry, Alzahra University, Vanak Square, P.O. Box 1993893973, Tehran, Iran. Electronic address: gmohammadi@alzahra.ac.ir.
² Department of Chemistry, Faculty of Physics and Chemistry, Alzahra University, Vanak Square, P.O. Box 1993893973, Tehran, Iran.
³ School of Chemistry, College of Science, University of Tehran, Tehran, Iran.
⁴ Department of Chemical Engineering, Quchan University of Technology; and UJ, Iran. Electronic address: fkm024@qiet.edu.cn.

PMID: 35809751
DOI: 10.1016/j.chemosphere.2022.135630

Abstract

Some new, highly selective, and sensitive colorimetric pH indicators, spiro[4H-indeno-[1,2-b]pyridine-4,3'-[3H]indoles] (SIPIs) in aqueous solution were developed. SIPIs were synthesized via a one-pot four-component condensation of isatin derivatives, β-diketones 1,3-indandione, and ammonium acetate using FSi-PrNH-BuSO₃H as a nanocatalyst in EtOH. According to the experimental evaluations, it was found that SIPI derivatives are pH indicators for naked-eye detection of OH- ion with intense color changes from orange to purple in the pH range of 10.3-12.

Keywords: FSi-PrNH-BuSO(3)H; Indandione; Spiroindeno-pyridineindoles; pH indicator.

MeSH terms

Colorimetry*
Hydrogen-Ion Concentration
Indoles
Water*

Substances

Indoles
Water