Robust Room Temperature Hysteresis in an FeIII Spin Crossover Metallomesogen

• Published in: European journal of inorganic chemistry Vol. 2016; no. 13-14; pp. 2025 - 2029
• Main Authors: Fitzpatrick, Anthony J., Martinho, Paulo N., Gildea, Brendan J., Holbrey, John D., Morgan, Grace G.
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 01.05.2016; WILEY‐VCH Verlag; Wiley; Wiley Subscription Services, Inc
• Subjects: Amphiphiles; Chemistry; Chemistry, Inorganic & Nuclear; Iron; Liquid crystals; Metallomesogens; Physical Sciences; Science & Technology; Spin crossover; Temperature; Thermal cycling; TRANSITION; Metallomesogens; Spin crossover; Amphiphiles; STATE; HYPERPOLARIZABILITY; Iron; Liquid crystals
• ISSN: 1434-1948; 1099-0682
• DOI: 10.1002/ejic.201501335

The high temperature magnetic and structural properties of an amphiphilic iron(III) spin crossover complex are reported. Thermal cycling reveals a scan rate‐dependent 20 K thermal hysteresis in the mT vs. T data close to room temperature. A fast scan rate is essential for the hysteresis but it is robust and reproducible after multiple thermal cycles. Differential scanning calorimetry and cross polarized microscopy are used to show that the magnetic switching aligns with a material state change from solid to ordered liquid phase on warming. The high temperature magnetic and structural properties of an amphiphilic iron(III) spin crossover complex are reported. Thermal cycling reveals a scan rate‐dependent 20 K thermal hysteresis close to room temperature. Differential scanning calorimetry and cross polarized microscopy are used to show that the magnetic switching aligns with a material change from solid to ordered liquid phase on warming.