Work

Effect of axial ligands removal on the spin crossover in 2D iron tetracyanonickelates

Year: 2025

Type: article

Abstract: The effect of axial ligands removal on the spin-transition phenomenon was investigated in iron(II) tetracyanonickelate with pyridine, 3-fluoropyridine and 3-chloropyridine as intercalated species. The samples were heated at 190°C, 210°C, 230°C and 250°C and analyzed in terms of structural stability and changes in spin-crossover phenomenon using infrared spectroscopy, powder X-ray diffraction and magnetometry of superconducting quantum interference device. The results showed that the partial removal of the axial ligands caused a decrease in transition temperatures and a significant reduction in transition hysteresis loops. The spin-transition phenomenon remained even after removing more than 0.8 ligand molecules in Fe(3-fluoropyridine)2[Ni(CN)4] and Fe(3-chloropyridine)2[Ni(CN)4]. The structural stability of the materials depended on π-π type interactions between the aromatic rings and dispersive type forces between the halogen groups in the inter-layer region. The findings provide deeper insight into the post-synthetic modification of spin crossover materials with a view to their application in molecular sensing.

Source: Inorganica Chimica Acta

DOI: 10.1016/j.ica.2025.122885

Authors: Y. Avila, M. González, J. Rodríguez-Hernández, Erick Ramírez, Ilich A. Ibarra, Jorge Balmaseda

Institutions: Universidad Nacional Autónoma de México, Centro de Investigación en Química Aplicada

Language: English

Topic: Magnetism in coordination complexes

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,830

Funders: Universidad Nacional Autónoma de México, Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México