Magnetocaloric properties of dendrimer complexes of Fe(III) with substituted Schiff base

• Published in: Liquid crystals 2018-05, Vol.45 (6), p.907-911
• Main Authors: Gruzdev, M. S., Korolev, V. V., Ramazanova, A. G., Chervonova, U. V., Balmasova, O. V.
• Format: Article
• Language: English
• Subjects: Coordination compounds; dendrimer complexes; heat capacity; Imines; Iron; Magnetic induction; magnetic phase transition; Magnetic properties; Magnetocaloric effect; Phase transitions; Schiff base; Specific heat; Temperature; Temperature dependence; thermotropic mesomorphism
• ISSN: 0267-8292; 1366-5855
• DOI: 10.1080/02678292.2017.1397783

In dendrimer complexes of iron (III) with Schiff base (three complexes of iron (III) based on azomethine 4,4′-dodecyloxybenzoyloxybenzoyl-4-salicylidene-2-aminopyridine, a significant magnetocaloric effect (MCE) and heat capacity was found the first time. It was found that the magnitude of MCE depends on the nature of the counter-ion of the complex. MCE were measured with a microcalorimeter over the temperature range of 278-320 K and in a magnetic induction of 0-1.0 T. The temperature dependences of the MCE dendrimer complexes of iron (III) with Schiff base were obtained for the first time. For all the samples studied, the existence of extreme temperature dependence of MCE in the range of temperatures 300-350 K, which is possibly the result of the magnetic phase transition, is shown. The correlation between the thermotropic mesomorphism with the magnetic phase transition in complexes has been established.