Cooperative Spin-Crossover in a Neutral Dinuclear Complex Based on a Functionalized Triazole Ligand
A novel spin-crossover (SCO) dinuclear complex, [Fe2(μ2-cp-trz)3(cp-trz)2(tcm)4] (cp-trz = 4-cyclo-pentyl-1,2,4-triazole, tcm- = tricyanomethanide anion), was synthesized and thoroughly characterized. Crystallographic analyses at 250 and 180 K revealed a centrosymmetric dinuclear structure with Fe(II) centers bridged by triazole ligands. The complex exhibits a cooperative hysteretic thermally induced abrupt one-step spin transition between high-spin (HS) and low-spin (LS) states. Magnetic measurements (Magn), X-rays diffraction (XRD), and optical microscopy (OM) show the following switching temperatures: T1/2↓Magn = 202 K and T1/2↑Magn = 212 K, and T1/2↓OM ≃ T1/2↓XRD = 203 K and T1/2↑OM ≃ T1/2↑XRD = 207 K. Moreover, structural and OM studies reveal significant anisotropic lattice changes, driven by strong hydrogen bonding along the c axis, which underpins the cooperative behavior of the SCO transition, and propagation of the HS/LS interface along the spin transition.
Authors
- Catherine Charles (ORCID: https://orcid.org/0000-0002-1548-5683)
- Kamel Boukheddaden (ORCID: https://orcid.org/0000-0003-0464-1609)
- Carlos J. Gómez‐García (ORCID: https://orcid.org/0000-0002-0015-577X)
- Sébastien Pillet (ORCID: https://orcid.org/0000-0003-0530-5244)
- Smaı̈l Triki (ORCID: https://orcid.org/0000-0003-0130-7461)
- Long‐He Li
- Ahmad Hobballah
- Nour-el-islam Belmouri (ORCID: https://orcid.org/0000-0003-4290-0640)
- Thirunavukkarasu Thangavel
Institutions
- Centre National de la Recherche Scientifique (FR)
- Universitat de València (ES)
- Université de Bretagne Occidentale (FR)
- Université de Versailles Saint-Quentin-en-Yvelines (FR)
- Université Paris-Saclay (FR)
- Laboratoire de Cristallographie, Résonance Magnétique et Modélisations (FR)
- Groupe d’Étude de la Matière Condensée (FR)
- Laboratoire Chimie Electrochimie Moléculaires et Chimie Analytique (FR)
- Université de Lorraine (FR)
Publication Details
- Journal
- Crystal Growth & Design
- Published
- 2025-03-26
- DOI
- https://doi.org/10.1021/acs.cgd.5c00158
- Citations
- 1
- Primary Topic
- Magnetism in coordination complexes
- Type
- article
- Field-Weighted Citation Impact
- 0.43
Funders
- Ministerio de Ciencia, Innovación y Universidades
- Agence Nationale de la Recherche
- Generalitat Valenciana