# Expression of concern: Picolylamine–Ni(ii) complex attached on 1,3,5-triazine-immobilized silica-coated Fe3O4 core/shell magnetic nanoparticles as an environmentally friendly and recyclable catalyst for the one-pot synthesis of substituted pyridine derivatives

## TL;DR

This paper expresses concern about a study that claims a new magnetic nanoparticle catalyst is effective for making pyridine compounds in an eco-friendly way.

## Contribution

The paper raises concerns about the validity or reliability of the original study's findings.

## Key findings

- The original study claimed a new catalyst for pyridine synthesis.
- This paper questions the accuracy or reproducibility of those claims.
- It highlights the need for further verification of the results.

## Abstract

Expression of concern for ʻPicolylamine–Ni(ii) complex attached on 1,3,5-triazine-immobilized silica-coated Fe3O4 core/shell magnetic nanoparticles as an environmentally friendly and recyclable catalyst for the one-pot synthesis of substituted pyridine derivativesʼ by Sobhan Rezayati et al., RSC Adv., 2023, 13, 12869–12888, https://doi.org/10.1039/D3RA01826A.