Photoinduced Magnetization in a Spin Crossover Iron(II)-Octacyanidoniobate(IV) Complex with Bridging Ligands between Iron(II) Centers

Itsuki Fukagawa; Koji Nakabayashi; Kenta Imoto; Kevin Tran; Maximilian Kilic; Franz Renz; Shin-ichi Ohkoshi

doi:10.1021/acs.cgd.5c00247

Photoinduced Magnetization in a Spin Crossover Iron(II)-Octacyanidoniobate(IV) Complex with Bridging Ligands between Iron(II) Centers

Itsuki Fukagawa
, Koji Nakabayashi
, Kenta Imoto
, Kevin Tran
, Maximilian Kilic
, Franz Renz
, Shin-ichi Ohkoshi

University of Tokyo (UTokyo)

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Abstract

We report a double-linked Fe(II) spin crossover complex,
[FeII(dpp)2]2[NbIV(CN)8]·6H2O, in which 1,3-di(4-pyridyl)propane (dpp)
ligands link Fe sites, while cyanide ligands bridge Fe and Nb sites. This complex
exhibitsspincrossoverbetweenthehigh-spin FeII (S=2)andlow-spinFeII (S= 0)
states at 120 K. Analysis of the temperature dependence of magnetic susceptibility
revealed that the low-temperature phase consists of high-spin and low-spin FeII
sites in a 36:64 ratio. Photoirradiation of the low-temperature phase at 3 K induces
light-induced excited spin-state trapping (LIESST), in which the low-spin FeII sites
transition to the high-spin state. Following this transition, magnetic interactions
between the high-spin FeII (S= 2) sites and the NbIV (S= 1/2) sites in the photoinduced phase lead to spontaneous magnetization
with a Curie temperature of 15 K.

Originalsprache	Englisch
Seiten (von - bis)	5247–5255
Seitenumfang	9
Fachzeitschrift	Crystal growth & design
Jahrgang	25
Ausgabenummer	14
Elektronisch veröffentlicht (E-Pub)	3 Juli 2025
DOIs	https://doi.org/10.1021/acs.cgd.5c00247
Publikationsstatus	Veröffentlicht - 16 Juli 2025

ASJC Scopus Sachgebiete

Allgemeine Chemie
Allgemeine Materialwissenschaften
Physik der kondensierten Materie

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10.1021/acs.cgd.5c00247

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title = "Photoinduced Magnetization in a Spin Crossover Iron(II)-Octacyanidoniobate(IV) Complex with Bridging Ligands between Iron(II) Centers",

abstract = "We report a double-linked Fe(II) spin crossover complex, [FeII(dpp)2]2[NbIV(CN)8]·6H2O, in which 1,3-di(4-pyridyl)propane (dpp) ligands link Fe sites, while cyanide ligands bridge Fe and Nb sites. This complex exhibitsspincrossoverbetweenthehigh-spin FeII (S=2)andlow-spinFeII (S= 0) states at 120 K. Analysis of the temperature dependence of magnetic susceptibility revealed that the low-temperature phase consists of high-spin and low-spin FeII sites in a 36:64 ratio. Photoirradiation of the low-temperature phase at 3 K induces light-induced excited spin-state trapping (LIESST), in which the low-spin FeII sites transition to the high-spin state. Following this transition, magnetic interactions between the high-spin FeII (S= 2) sites and the NbIV (S= 1/2) sites in the photoinduced phase lead to spontaneous magnetization with a Curie temperature of 15 K.",

author = "Itsuki Fukagawa and Koji Nakabayashi and Kenta Imoto and Kevin Tran and Maximilian Kilic and Franz Renz and Shin-ichi Ohkoshi",

note = "Publisher Copyright: {\textcopyright} 2025 American Chemical Society.",

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doi = "10.1021/acs.cgd.5c00247",

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T1 - Photoinduced Magnetization in a Spin Crossover Iron(II)-Octacyanidoniobate(IV) Complex with Bridging Ligands between Iron(II) Centers

AU - Fukagawa, Itsuki

AU - Nakabayashi, Koji

AU - Imoto, Kenta

AU - Tran, Kevin

AU - Kilic, Maximilian

AU - Renz, Franz

AU - Ohkoshi, Shin-ichi

PY - 2025/7/16

Y1 - 2025/7/16

N2 - We report a double-linked Fe(II) spin crossover complex, [FeII(dpp)2]2[NbIV(CN)8]·6H2O, in which 1,3-di(4-pyridyl)propane (dpp) ligands link Fe sites, while cyanide ligands bridge Fe and Nb sites. This complex exhibitsspincrossoverbetweenthehigh-spin FeII (S=2)andlow-spinFeII (S= 0) states at 120 K. Analysis of the temperature dependence of magnetic susceptibility revealed that the low-temperature phase consists of high-spin and low-spin FeII sites in a 36:64 ratio. Photoirradiation of the low-temperature phase at 3 K induces light-induced excited spin-state trapping (LIESST), in which the low-spin FeII sites transition to the high-spin state. Following this transition, magnetic interactions between the high-spin FeII (S= 2) sites and the NbIV (S= 1/2) sites in the photoinduced phase lead to spontaneous magnetization with a Curie temperature of 15 K.

AB - We report a double-linked Fe(II) spin crossover complex, [FeII(dpp)2]2[NbIV(CN)8]·6H2O, in which 1,3-di(4-pyridyl)propane (dpp) ligands link Fe sites, while cyanide ligands bridge Fe and Nb sites. This complex exhibitsspincrossoverbetweenthehigh-spin FeII (S=2)andlow-spinFeII (S= 0) states at 120 K. Analysis of the temperature dependence of magnetic susceptibility revealed that the low-temperature phase consists of high-spin and low-spin FeII sites in a 36:64 ratio. Photoirradiation of the low-temperature phase at 3 K induces light-induced excited spin-state trapping (LIESST), in which the low-spin FeII sites transition to the high-spin state. Following this transition, magnetic interactions between the high-spin FeII (S= 2) sites and the NbIV (S= 1/2) sites in the photoinduced phase lead to spontaneous magnetization with a Curie temperature of 15 K.

UR - https://www.scopus.com/pages/publications/105009630617

U2 - 10.1021/acs.cgd.5c00247

DO - 10.1021/acs.cgd.5c00247

M3 - Article

SN - 1528-7483

VL - 25

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JO - Crystal growth & design

JF - Crystal growth & design

IS - 14

ER -