Stimuli-responsive magnetic materials: impact of spin and electronic modulation

Kaushik, Krishna; Mehta, Sakshi; Das, Mayurika; Ghosh, Sounak; Kamilya, Sujit; Mondal, Abhishake

doi:10.1039/d3cc04268e

Cited by 7 publications

(8 citation statements)

References 209 publications

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“…For complex 2 , the photoinduced metastable HS state relaxes back to the ground LS state via a thermal relaxation process with T LIESST 65 K. Complex 1 .7H 2 O·1.5CH 3 OH represents the first reported example where the [W(CN) 8 ] 3– building block acts as counter anion and the system exhibits a solvent- and counteranion-induced two-step spin-state switching phenomenon near room temperature and photomagnetic effect at low temperature. In light of the results obtained in this work, we can conclude that explicit examination of magneto-structural analyses of a system offers valuable insight into the tuning of spin-transition temperature of an SCO material which in turn can help in creating advanced SCO materials with controllable properties …”

Section: Discussionmentioning

confidence: 99%

“…In light of the results obtained in this work, we can conclude that explicit examination of magneto-structural analyses of a system offers valuable insight into the tuning of spin-transition temperature of an SCO material which in turn can help in creating advanced SCO materials with controllable properties. 16 ■ ASSOCIATED CONTENT…”

Section: ■ Introductionmentioning

confidence: 99%

“…23 The extent of cooperativity depends on the structural matrix, crystal packing, and various intra-and intermolecular interactions introduced by substituents as well as solvent molecules and counterions (cations or anions). 16 When the extent of interaction is strong enough, it leads to an abrupt transition, while the weak one prefers a gradual SCO phenomenon. Such distinctive properties exhibited by these materials make them highly suitable and promising candidates for use in device applications.…”

Section: ■ Introductionmentioning

confidence: 99%

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Light-Induced, Structural Matrix Guided Stepwise Spin-State Switching in 3d-5d Molecular Assembly

Kaushik,

Sarkar,

Kamilya

et al. 2024

Inorg. Chem.

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A new iron(II) molecular complex {[W(CN) 8 ][Fe-(bik*) 3 ] 2 }BF 4 •7H 2 O•1.5CH 3 OH (1.7H 2 O•1.5CH 3 OH) was synthesized using a versatile octacyanotungstate(V) building block and N-donor bidentate ligand (bik* = bis(1-ethyl-1H-imidazol-2-yl)ketone) and detailed characterizations were carried out. The crystal structure of 1.7H 2 O• 1.5CH 3 OH is composed of an ionic salt from one anionic [W(CN) 8 ] 3− unit, two isolated cationic [Fe(bik*) 3 ] 2+ units, and one BF 4 − counteranion in the asymmetric unit. Magnetic studies of 1.7H 2 O•1.5CH 3 OH display interesting two-step reversible thermo-induced spin-state switching and the partially desolvated form 1.7H 2 O shows a photomagnetic effect at low temperatures. Additionally, the physical properties of 1.7H 2 O•1.5CH 3 OH were compared with the monomeric unit of {[Fe(bik*) 3 ] 2 }•4ReO 4 •H 2 O (2.H 2 O) and detailed photophysical investigations were also performed to study the effect of a structural matrix {[W(CN) 8 ] 3− and ReO 4 − unit} on the spin-state switching properties of the [Fe(bik*) 3 ] 2+ unit in both systems (1.7H 2 O•1.5CH 3 OH and 2.H 2 O).

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Section: Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Light-Induced, Structural Matrix Guided Stepwise Spin-State Switching in 3d-5d Molecular Assembly

Kaushik,

Sarkar,

Kamilya

et al. 2024

Inorg. Chem.

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“…13 Although transition metals with d 4 −d 7 electronic configurations exhibit such bistable spin-state switching behavior, it is mainly explored in Fe(II) systems having an octahedral N 6 coordination environment. 14,15 The spin-state switching is often accompanied by a local change in the bond lengths and angles around the SCO active center due to the redistribution of electrons in the t 2g and e g levels. Further, these local changes can induce overall changes in the crystal lattice, such as changes in entropy and enthalpy, changes in volume, intermolecular interactions, etc., between neighboring molecules, as shown in Figure 1a.…”

Section: Introductionmentioning

confidence: 99%

Realm of Spin State Switching Materials: Toward Realization of Molecular and Nanoscale Devices

Kamilya,

Dey,

Kaushik

et al. 2024

Chem. Mater.

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For various technological applications involving the design of molecular-and nanoscale devices, spin crossover (SCO) materials are a way forward owing to an ability to have a readout in the form of distinct changes in physical properties accompanying the stimuli-responsive spin-state modifications. In particular, ironbased molecular SCO systems are of great interest as they have shown vast potential applications in the design of functional devices, including sensors and electrical, optical, mechanical, spintronic, memory storage, and processing devices. Due to the inherent fragility of SCO systems, several factors, such as substrate selection, electrode materials (in the case of electronic devices), and molecule−substrate interactions, must be carefully considered while integrating SCO systems into functional devices. To ensure reliable device performance, the compatibility of SCO complexes with the techniques used to fabricate devices is also crucial. Considering these factors, the major aim of this Perspective is to concisely represent a part of our research work on this broad up-and-coming topic, mentioning the relevance of spin crossover materials, and provide an overview to the reader about the recent developments, achievements, and advancements of micro-and nanoscale devices based on the phenomena of spin-state switching, which in turn is highly versatile. A particular emphasis is given to the SCO systems used for thin films, nanoparticles, and molecule-based devices, highlighting the challenges and prospects associated with each approach.

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“…1 Spin crossover (SCO) compounds 2–13 and mononuclear single-molecule magnets (SMMs), 14–27 in their excellent paradigms of addressable and stimuli-responsive magnetic materials, are bistable magnetic molecules with potential applications in molecular spintronic devices and quantum computers. 28–52…”

Section: Introductionmentioning

confidence: 99%

How the spin state tunes the slow magnetic relaxation field dependence in spin crossover cobalt(ii) complexes

Rabelo,

Toma,

Julve

et al. 2024

Dalton Trans.

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Stimuli-responsive magnetic materials: impact of spin and electronic modulation

Abstract: Addressing molecular bistability as a function of external stimuli, especially in spin-crossover (SCO) and metal-to-metal electron transfer (MMET) systems, have seen a surge interest in the field of molecule-based magnetic...

Cited by 7 publications

References 209 publications

Light-Induced, Structural Matrix Guided Stepwise Spin-State Switching in 3d-5d Molecular Assembly

Light-Induced, Structural Matrix Guided Stepwise Spin-State Switching in 3d-5d Molecular Assembly

Realm of Spin State Switching Materials: Toward Realization of Molecular and Nanoscale Devices

How the spin state tunes the slow magnetic relaxation field dependence in spin crossover cobalt(ii) complexes

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