# Novel 1,3-Diazepines as Nontoxic Corrosion Inhibitors

## TL;DR

Scientists developed new 1,3-diazepine compounds that effectively prevent corrosion without being toxic to human cells.

## Contribution

The study introduces and evaluates 2-substituted 1,3-diazepines as novel, non-toxic corrosion inhibitors.

## Key findings

- The synthesized 1,3-diazepines showed significant corrosion inhibition performance.
- In silico and in vitro tests confirmed low toxicity and cytotoxicity risks.
- These compounds are promising for use as organic corrosion inhibitors.

## Abstract

Nitrogen-containing
heterocyclic compounds are among
the most effective
corrosion inhibitors, primarily acting through adsorption by donating
electron pairs to metallic surfaces. While benzodiazepines and other
1,4- and 1,5-diazepine derivatives have demonstrated inhibitory activity,
1,3-diazepan-2-ylidenes remain unexplored in the literature. In the
present study, ketene dithioacetals were employed as building blocks
for the synthesis of a novel series of 2-substituted 1,3-diazepines.
Their corrosion inhibition efficiency was systematically evaluated,
alongside in silico predictions of toxicity risks and in vitro cytotoxicity
assays against the MDA-MB-231 human breast adenocarcinoma cell line,
the A549 human lung carcinoma cell line, the TOV-21G human ovarian
adenocarcinoma cell line, and the WI-26VA4 human lung fibroblast cell
line. The synthesized compounds exhibited significant corrosion inhibition
performance, while in silico analyses indicated no relevant toxicity
risks, findings further supported by low cytotoxicity observed in
in vitro assays. These results highlight 2-substituted 1,3-diazepines
as promising candidates for application as organic corrosion inhibitors.