CW and TR EPR study of photomagnetic properties of heptanuclear Fe(II)–Fe(III) complex

Ekaterina Batueva; Andrey Sukhanov; Yuri Kandrashkin; Alsu Sharipova; Liudmila Savostina; Olga Turanova; Alexander Turanov

doi:10.1063/5.0319549

CW and TR EPR study of photomagnetic properties of heptanuclear Fe(II)–Fe(III) complex

E Ekaterina Batueva (Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center, Russian Academy of Sciences 1 , Sibirsky Tract, 10/7, 420029 Kazan,) A Andrey Sukhanov (Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center, Russian Academy of Sciences 1 , Sibirsky Tract, 10/7, 420029 Kazan,) Y Yuri Kandrashkin (Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center, Russian Academy of Sciences 1 , Sibirsky Tract, 10/7, 420029 Kazan,) A Alsu Sharipova (Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center, Russian Academy of Sciences 1 , Sibirsky Tract, 10/7, 420029 Kazan,) L Liudmila Savostina (Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center, Russian Academy of Sciences 1 , Sibirsky Tract, 10/7, 420029 Kazan,) O Olga Turanova (Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center, Russian Academy of Sciences 1 , Sibirsky Tract, 10/7, 420029 Kazan,) A Alexander Turanov (Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center, Russian Academy of Sciences 1 , Sibirsky Tract, 10/7, 420029 Kazan,)

Abstract

The photomagnetic behavior of a mixed-valence heptanuclear complex [Fe(II)(CN)6{Fe(III)L}6](SCN)2, where L = dianion N,N′-bis(1-hydroxy-2-benzyliden)-1,7-diamino-4-azaheptane, has been investigated. The structure of the complex was optimized using density functional theory with the def2-SVP basis set and the Tao–Perdew–Staroverov–Scuseria functional. Continuous wave (CW) and time-resolved electron paramagnetic resonance (TR EPR) spectroscopy measurements at low temperatures (20–65 K) reveal a reversible, light-induced change in EPR signal intensity, indicating photoswitching between high-spin and low-spin states. The analysis of the CW and TR EPR spectroscopy results identified two types of effects related to sample magnetization: local sample heating by light and magnetization changes associated with photoinduced high-spin to low-spin transitions. These results demonstrate the potential of this complex as a photoswitchable magnetic material.

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Article Details

Journal The Journal of Chemical Physics

Volume / Issue Vol. 164, Issue 16

Published April 28, 2026

DOI 10.1063/5.0319549

ISSN 0021-9606

Publisher American Institute of Physics

Journal Info

The Journal of Chemical Physics

American Institute of Physics

ISSN: 0021-9606 Physical Sciences