[CoII(phimpy)2](ClO4)2and [CoII(ipimpy)2](ClO4)2: New Cobalt(II) Spin Crossover Compounds, and the Role of the Ligand Flexibility in Spin Transition Behavior

We analyse in detail the role of surface relaxations on the spin transition phenomenon through an Ising-like model solved in the inhomogeneous mean field approach.

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Photo-induced spin-transition: the role of the iron(II) environment distortion

Acta Crystallographica Section B Structural Science ◽

10.1107/s0108768104029751 ◽

2005 ◽

Vol 61 (1) ◽

pp. 25-28 ◽

Cited By ~ 158

Author(s):

Mathieu Marchivie ◽

Philippe Guionneau ◽

Jean-François Létard ◽

Daniel Chasseau

Keyword(s):

Spin Crossover ◽

Strong Dependence ◽

Spin Transition ◽

Magnetic Behaviour ◽

Magnetic Data ◽

Structural Parameter ◽

Structure Property ◽

Wide Range ◽

Shed Light

The [FeL n (NCS)2] iron(II) spin-crossover complexes cover a wide range of magnetic behaviour. Owing to the large number of known structural and magnetic data, this series is perfectly adapted to the investigation of the structure–magnetic properties relationship. In this paper we propose a new structural parameter, denoted Θ, which is used to correlate the features of the spin-crossover phenomena with the distortion of the iron environment. In particular, this parameter has shed light on the role of such distortion on the limiting temperature of photo-inscription, known as T(LIESST). A strong dependence of T(LIESST) on Θ is clearly demonstrated. The stronger the distortion the higher the T(LIESST) value. This structure–property dependence represents, for instance, a powerful tool to estimate the highest potential T(LIESST) value for a series of complexes. This limit in the [FeL n (NCS)2] series is estimated to be around 120 K, which probably prevents their use in any industrial application.

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Bias induced spin transitions of spin crossover molecules: the role of charging effect

Physical Chemistry Chemical Physics ◽

10.1039/c6cp08265c ◽

2017 ◽

Vol 19 (11) ◽

pp. 7652-7658 ◽

Cited By ~ 4

Author(s):

Hua Hao ◽

Ting Jia ◽

Xiaohong Zheng ◽

Zhi Zeng

Keyword(s):

High Spin ◽

Spin Crossover ◽

Spin Transition ◽

Charging Effect ◽

Spin Transitions

A new mechanism is proposed to understand the recently observed spin transition of spin crossover molecules from low spin to high spin under bias voltages and it is closely related to one additional electron on the spin crossover molecules.

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Iron(II) Spin Crossover Coordination Polymers Derived From a Redox Active Equatorial Tetrathiafulvalene Schiff-Base Ligand

Frontiers in Chemistry ◽

10.3389/fchem.2021.692939 ◽

2021 ◽

Vol 9 ◽

Author(s):

Ya-Ru Qiu ◽

Long Cui ◽

Jing-Yuan Ge ◽

Mohamedally Kurmoo ◽

Guijun Ma ◽

...

Keyword(s):

Schiff Base ◽

Coordination Polymers ◽

Fluorescence Intensity ◽

Schiff Base Ligand ◽

Layered Structure ◽

Spin Crossover ◽

Spin Transition ◽

Redox Activity ◽

Transition Behavior ◽

Redox Active

Two polymorphic FeII coordination polymers [FeIIL (TPPE)0.5] 1) and [(FeII3L3 (TPPE)1.5)] 2), were obtained from a redox-active tetrathiafulvalene (TTF) functionalized ligand [H2L = 2,2’-(((2-(4,5-bis-(methylthio)-1,3-dithiol-2-ylidene)benzo(d) (1,3) dithiole-5,6-diyl)bis-(azanediyl))bis-(meth anylylidene)) (2E,2E')-bis(3-oxobutanoate)] and a highly luminescent connector {TPPE = 1,1,2,2-tetrakis[4-(pyridine-4-yl)phenyl]-ethene}. Complex 1 has a layered structure where the TPPE uses its four diverging pyridines from the TPPE ligand are coordinated by the trans positions to the flat TTF Schiff-base ligand, and complex 2 has an unprecedented catenation of layers within two interpenetrated frameworks. These coordination polymers reserved the redox activity of the TTF unit. Complex 1 shows gradual spin transition behavior without hysteresis. And the fluorescence intensity of TPPE in 1 changes in tandem with the spin crossover (SCO) transition indicating a possible interplay between fluorescence and SCO behavior.

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Abrupt spin transition in a modified-terpyridine cobalt(ii) complex with a highly-distorted [CoN6] core

Dalton Transactions ◽

10.1039/c8dt02367k ◽

2018 ◽

Vol 47 (39) ◽

pp. 13809-13814 ◽

Cited By ~ 10

Author(s):

Manabu Nakaya ◽

Ryo Ohtani ◽

Jong Won Shin ◽

Masaaki Nakamura ◽

Leonard F. Lindoy ◽

...

Keyword(s):

Spin Crossover ◽

Spin Transition ◽

Transition Behavior ◽

Crossover Behavior

The cobalt(ii) complex [Co(Naph-C2-terpy)2](BF2)2 (1) incorporating a highly distorted [CoN6] core was found to exhibit abrupt spin transition behavior, unlike solvated 1·2MeOH, which showed gradual spin crossover behavior.

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Abrupt spin crossover in iron(iii) complexes with aromatic anions

Dalton Transactions ◽

10.1039/c9dt02373a ◽

2019 ◽

Vol 48 (41) ◽

pp. 15515-15520 ◽

Cited By ~ 5

Author(s):

Sharon E. Lazaro ◽

Adil Alkaş ◽

Seok J. Lee ◽

Shane G. Telfer ◽

Keith S. Murray ◽

...

Keyword(s):

Transition Temperature ◽

Spin Crossover ◽

Spin Transition ◽

Halogen Bonds ◽

Aromatic Anions

Two iron(iii) complexes, [Fe(qsal-X)2]OTs·nH2O, are found to exhibit abrupt spin crossover with the spin transition temperature substituent dependent, and X⋯O halogen bonds linking the spin centres.

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Structural, magnetic and Mössbauer spectroscopic studies of the [Fe(3-bpp)2](CF3COO)2 complex: role of crystal packing leading to an incomplete Fe(ii) high spin ⇋ low spin transition

CrystEngComm ◽

10.1039/d0ce01687j ◽

2021 ◽

Vol 23 (15) ◽

pp. 2854-2861

Author(s):

Kristian Handoyo Sugiyarto ◽

Djulia Onggo ◽

Hiroki Akutsu ◽

Varimalla Raghavendra Reddy ◽

Hari Sutrisno ◽

...

Keyword(s):

High Spin ◽

Crystal Packing ◽

Spin Transition ◽

Spectroscopic Studies ◽

Mononuclear Complex

Mononuclear complex [Fe(3-bpp)2](CF3COO)2 exhibits a thermal (HS + HS) ⇋ (HS + LS) transition at ∼226 K which is not associated with any crystallographic transition.

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Electrical read-out of light-induced spin transition in thin film spin crossover/graphene heterostructures

Journal of Materials Chemistry C ◽

10.1039/d0tc05202g ◽

2021 ◽

Author(s):

Nikita Konstantinov ◽

Arthur Tauzin ◽

Ulrich Nguetchuissi Noumbé ◽

Diana Dragoe ◽

Bohdan Kundys ◽

...

Keyword(s):

Thin Film ◽

Spin Crossover ◽

Spin Transition ◽

Switching Device ◽

Electronic Switching ◽

Spin Transitions

An opto-electronic switching device made from an evaporated spin crossover thin film over a graphene sensor is presented. The electrical transduction of both temperature and light-induced reversible spin transitions are demonstrated.

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