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

Research output: Contribution to journal › Article › Research › 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.

Original language	English
Pages (from-to)	5247–5255
Number of pages	9
Journal	Crystal growth & design
Volume	25
Issue number	14
E-pub ahead of print	3 Jul 2025
DOIs	https://doi.org/10.1021/acs.cgd.5c00247
Publication status	Published - 16 Jul 2025

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

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10.1021/acs.cgd.5c00247

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@article{014076fc19214e0f9e4cf5599730f76e,

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 complexexhibitsspincrossoverbetweenthehigh-spin FeII (S=2)andlow-spinFeII (S= 0)states at 120 K. Analysis of the temperature dependence of magnetic susceptibilityrevealed that the low-temperature phase consists of high-spin and low-spin FeIIsites in a 36:64 ratio. Photoirradiation of the low-temperature phase at 3 K induceslight-induced excited spin-state trapping (LIESST), in which the low-spin FeII sitestransition to the high-spin state. Following this transition, magnetic interactionsbetween the high-spin FeII (S= 2) sites and the NbIV (S= 1/2) sites in the photoinduced phase lead to spontaneous magnetizationwith 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.",

year = "2025",

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

language = "English",

volume = "25",

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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 complexexhibitsspincrossoverbetweenthehigh-spin FeII (S=2)andlow-spinFeII (S= 0)states at 120 K. Analysis of the temperature dependence of magnetic susceptibilityrevealed that the low-temperature phase consists of high-spin and low-spin FeIIsites in a 36:64 ratio. Photoirradiation of the low-temperature phase at 3 K induceslight-induced excited spin-state trapping (LIESST), in which the low-spin FeII sitestransition to the high-spin state. Following this transition, magnetic interactionsbetween the high-spin FeII (S= 2) sites and the NbIV (S= 1/2) sites in the photoinduced phase lead to spontaneous magnetizationwith 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 complexexhibitsspincrossoverbetweenthehigh-spin FeII (S=2)andlow-spinFeII (S= 0)states at 120 K. Analysis of the temperature dependence of magnetic susceptibilityrevealed that the low-temperature phase consists of high-spin and low-spin FeIIsites in a 36:64 ratio. Photoirradiation of the low-temperature phase at 3 K induceslight-induced excited spin-state trapping (LIESST), in which the low-spin FeII sitestransition to the high-spin state. Following this transition, magnetic interactionsbetween the high-spin FeII (S= 2) sites and the NbIV (S= 1/2) sites in the photoinduced phase lead to spontaneous magnetizationwith a Curie temperature of 15 K.

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U2 - 10.1021/acs.cgd.5c00247

DO - 10.1021/acs.cgd.5c00247

M3 - Article

SN - 1528-7483

VL - 25

SP - 5247

EP - 5255

JO - Crystal growth & design

JF - Crystal growth & design

IS - 14

ER -

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

Abstract

ASJC Scopus subject areas

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