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Spin crossover (SCO) complexes, through their reversible spin transition under external stimuli, can work as switchable memory materials. Here, we present a protocol for the synthesis and characterization of a specific polyanionic iron SCO complex and its diluted systems. We describe steps for its synthesis and the determination of crystallographic structure of the SCO complex in diluted systems. We then detail a range of spectroscopic and magnetic techniques employed to monitor the spin state of the SCO complex in both diluted solid- and liquid-state systems. For complete details on the use and execution of this protocol, please refer to Galán-Mascaros et al..
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http://dx.doi.org/10.1016/j.xpro.2023.102394 | DOI Listing |
J Mater Chem C Mater
August 2025
LCC, CNRS and Université de Toulouse, UPS, INP F-31077 Toulouse France
The combination of spin-crossover (SCO) complexes with electrically conducting materials offers a promising route for developing stimuli-responsive electronics, yet the mechanism of charge transport modulation remains unexplored. Here, we investigate a bilayer heterostructure comprising silica-coated SCO nanoparticles [Fe(Htrz)(trz)](BF)@SiO within a polyvinylpyrrolidone (PVP) matrix and organic semiconductors (OSCs), where mechanical stress generated by spin-state switching within the PVP:SCO layer modulates the conductance within the OSC layer. Through piezo-resistivity characterization, we reveal a reversible conductance modulation in the OSC layer under hydrostatic pressure, providing a quantitative evaluation of pressure-induced stress sensitivity with the OSC layer.
View Article and Find Full Text PDFDalton Trans
August 2025
State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, No. 2 Linggong Road, Dalian 116024, China.
Understanding the relationship between molecular packing/interaction and the spin crossover property is essential for advancing solid-state molecular memory devices. In this work, a series of hexadentate Schiff-base manganese(III) complexes ([Mn(4F-sal323)]X, X = ClO (1); X = AsF (2); X = PF (3); X = ReO (4) and X = NO (5)) were synthesized and characterized. Magnetic studies showed that complex 1 exhibited an abrupt spin transition at 90 K with a 10 K wide thermal hysteresis, while complexes 2-5 exhibited gradual and incomplete spin transition with no hysteresis.
View Article and Find Full Text PDFChem Commun (Camb)
August 2025
Department Chemie, Johannes-Gutenberg-Universität Mainz, Duesbergweg 10-14, 55128 Mainz, Germany.
The influence of chirality on the packing of solids, and consequently on the magnetic behavior of spin crossover (SCO) materials, is well documented. Here, we present an exceptional case involving three iron(II) complexes [Fe(LNaph-ODA-(X)-Al)(NCBH)]·0.5 CHCN (X = racemic (C1), (C2), and (C3)), based on a new 1,3,4-oxadiazole ligand (LNaph-ODA-(X)-Al) with distinct stereocenters.
View Article and Find Full Text PDFChem Sci
August 2025
School of Materials Science and Chemical Engineering, Ningbo University Ningbo 315211 China
A comprehensive analysis of physical and chemical properties using the same family of spin-crossover complexes is crucial for understanding and designing structure-property relationships. However, finding an appropriate system remains challenging. Here, a series of guest-saturated states based on the 2D Hofmann-type framework [Fe(prentrz)Pd(CN)]·guest (prentrz = (1,2)-3-phenyl--(4-1,2,4-triazol-4-yl)prop-2-en-1-imine; 1·guest) is reported, exhibiting a guest-manipulated slow dynamic effect on spin equilibrium in an incomplete two-step spin-crossover (SCO) process.
View Article and Find Full Text PDFInorg Chem
August 2025
Institut de Química Computacional i Catàlisi i Departament de Química of Computational Chemistry and Catalysis, Chemistry Department, University of Girona, Montilivi Campus, Girona, Catalonia 17003, Spain.
We investigate spin-state transitions in a series of 24 [Fe(bpp)] spin-crossover (SCO) complexes using density functional theory (DFT). The TPSSh/def2-TZVP approach demonstrates reasonable accuracy in predicting spin-state energetics compared to other functionals, though significant deviations persist in transition temperature () estimates. Temperature-dependent and quasi-harmonic corrections for low-frequency vibrational contributions to enthalpic and entropic terms yielded only marginal improvements.
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