One-pot synthesis of polysubstituted pyridine-3-cyanides and their application as corrosion inhibitors for steel in acidic environments:Empirical and theoretical investigation

Hany M. Abd El-Lateef; Fawy M. Abd El Latif; Mai M. Khalaf; Mohammed A.O. Basubaih; Antar A. Abdelhamid; Kamal Shalabi

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One-pot synthesis of polysubstituted pyridine-3-cyanides and their application as corrosion inhibitors for steel in acidic environments:Empirical and theoretical investigation

Updated：2026-08-24

- One-pot synthesis of polysubstituted pyridine-3-cyanides and their application as corrosion inhibitors for steel in acidic environments:Empirical and theoretical investigation
- Chinese Journal of Chemical Engineering Vol. 94, Issue 6, Pages: 113-127(2026)
- Affiliations：
  
  Department of Chemistry, College of Science, King Faisal University, Al-Ahsa 31982, Saudi Arabia
  Department of Chemistry, Faculty of Science, Al-Baha University, Al-Baha 1988, Saudi Arabia
  Department of Chemistry, Faculty of Science, Sohag University, Sohag 8252, Egypt
  Department of Chemistry, College of Science and Humanities in Al-Kharj, Prince Sattam bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
  Chemistry Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt
- Author bio：
  
  Corresponding author. E-mail address: hmahmed@kfu.edu.sa(H.M. Abd El-Lateef)
- Funds：
- DOI：
  CLC：
- Received：24 October 2025，
  
  Revised：2026-01-13，
  
  Accepted：14 January 2026，
  
  Online First：25 March 2026，
  
  Published：2026-06
- Accepted：
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Hany M. Abd El-Lateef, Fawy M. Abd El Latif, Mai M. Khalaf, et al. One-pot synthesis of polysubstituted pyridine-3-cyanides and their application as corrosion inhibitors for steel in acidic environments:Empirical and theoretical investigation[J]. Chinese Journal of Chemical Engineering, 2026, 94(6): 113-127.
DOI：

Hany M. Abd El-Lateef, Fawy M. Abd El Latif, Mai M. Khalaf, et al. One-pot synthesis of polysubstituted pyridine-3-cyanides and their application as corrosion inhibitors for steel in acidic environments:Empirical and theoretical investigation[J]. Chinese Journal of Chemical Engineering, 2026, 94(6): 113-127. DOI：

摘要

Abstract

Four poly-substituted 3-cyanopyridine derivatives (ACP-1-ACP-4) were prepared

via

a one-pot fourcomponents reaction involving different aromatic carbaldehydes

phenylethanone compounds

malonic dinitrile

and three different RONa were used. The pyridine derivatives were confirmed based on elemental

spectral results containingFTIR

HNMR

CNMR

and MS spectroscopies. The synthesized pyridine compounds have shown good inhibitory performance against carbon steel corrosion in sulfuric acid solutions. Potentiodynamic polarization results designated that the poly-substituted 3cyanopyridine derivatives proceeded as mixed-category inhibitors. Electrochemical impedance spectroscopy (EIS) revealed that the ACP-1-ACP-4 compounds significantly reduced corrosion

via

a charge transfer mechanism

exhibiting inhibition efficiencies ranging from 94.1% to 97.2% at a concentration of 1.0 mmol·L

- 1

. The calculated free energy of adsorption values

based on Langmuir adsorption isotherm plots

suggested that the ACP compounds adsorbed onto the steel interface

via

both chemisorption and physisorption

with chemisorption as the predominant mechanism. Scanning electron microscopy (SEM) and FTIR examinations confirmed the presence of a protective film formed on the steel interface. Similarly

a theoretical study using density functional theory (DFT) and Monte Carlo (MC) simulations corroborated experimental findings

concluding that polysubstituted 3-cyanopyridine derivatives exhibit remarkable corrosion protection

efficiency for steel in acidic environments. Finally

the experimental findings support the theoretical predictions

demonstrating a good agreement.

关键词

Keywords

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