AustralieFrV1, Main, Exploration, bibRecord, 007141

Thermal‐ and Light‐Induced Spin Crossover in a Guest‐Dependent Dinuclear Iron(II) System

Identifieur interne : 007141 ( Main/Exploration ); précédent : 007140; suivant : 007142

Thermal‐ and Light‐Induced Spin Crossover in a Guest‐Dependent Dinuclear Iron(II) System

Auteurs : Jarrod Amoore [Australie] ; Suzanne Neville [Australie] ; Boujemaa Moubaraki [Australie] ; Simon Iremonger [Australie] ; Keith Murray [Australie] ; Jean-François Létard [France] ; Cameron Kepert [Australie]

Source :

Chemistry – A European Journal [ 0947-6539 ] ; 2010-02-08.

RBID : ISTEX:8FA25EE25D0FCDE3A4D58057839A632B48EA393E

English descriptors

Abstract

We previously reported the dinuclear material [FeII2(ddpp)2(NCS)4]⋅4 CH2Cl2 (1⋅4 CH2Cl2; ddpp=2,5‐di(2′,2′′‐dipyridylamino)pyridine) and its partially desolvated analogue (1⋅CH2Cl2), which undergo two‐ and one‐step spin‐crossover (SCO) transitions, respectively. Here, we manipulate the type and degree of solvation in this system and find that either a one‐ or two‐step spin transition can be specifically targeted. The chloroform clathrate 1⋅4 CHCl3 undergoes a relatively abrupt one‐step SCO, in which the two equivalent FeII sites within the dinuclear molecule crossover simultaneously. Partial desolvation of 1⋅4 CHCl3 to form 1⋅3 CHCl3 and 1⋅CHCl3 occurs through single‐crystal‐to‐single‐crystal processes (monoclinic C2/c to P21/n to P21/n) in which the two equivalent FeII sites become inequivalent sites within the dinuclear molecule of each phase. Both 1⋅3 CHCl3 and 1⋅CHCl3 undergo one‐step spin transitions, with the former having a significantly higher SCO temperature than 1⋅4 CHCl3 and the latter, and each has a broader SCO transition than 1⋅4 CHCl3, attributable to the overlap of two SCO steps in each case. Further magnetic manipulation can be carried out on these materials through reversibly resolvating the partially desolvated material with chloroform to produce the original one‐step SCO, or with dichloromethane to produce a two‐step SCO reminiscent of that seen for 1⋅4 CH2Cl2. Furthermore, we investigate the light‐induced excited spin state trapping (LIESST) effect on 1⋅4 CH2Cl2 and 1⋅CH2Cl2 and observe partial LIESST activity for the former and no activity for the latter.

Url:

https://api.istex.fr/document/8FA25EE25D0FCDE3A4D58057839A632B48EA393E/fulltext/pdf

DOI: 10.1002/chem.200901809

Affiliations:

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<term>Susceptibility measurements</term>
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<front><div type="abstract">We previously reported the dinuclear material [FeII2(ddpp)2(NCS)4]⋅4 CH2Cl2 (1⋅4 CH2Cl2; ddpp=2,5‐di(2′,2′′‐dipyridylamino)pyridine) and its partially desolvated analogue (1⋅CH2Cl2), which undergo two‐ and one‐step spin‐crossover (SCO) transitions, respectively. Here, we manipulate the type and degree of solvation in this system and find that either a one‐ or two‐step spin transition can be specifically targeted. The chloroform clathrate 1⋅4 CHCl3 undergoes a relatively abrupt one‐step SCO, in which the two equivalent FeII sites within the dinuclear molecule crossover simultaneously. Partial desolvation of 1⋅4 CHCl3 to form 1⋅3 CHCl3 and 1⋅CHCl3 occurs through single‐crystal‐to‐single‐crystal processes (monoclinic C2/c to P21/n to P21/n) in which the two equivalent FeII sites become inequivalent sites within the dinuclear molecule of each phase. Both 1⋅3 CHCl3 and 1⋅CHCl3 undergo one‐step spin transitions, with the former having a significantly higher SCO temperature than 1⋅4 CHCl3 and the latter, and each has a broader SCO transition than 1⋅4 CHCl3, attributable to the overlap of two SCO steps in each case. Further magnetic manipulation can be carried out on these materials through reversibly resolvating the partially desolvated material with chloroform to produce the original one‐step SCO, or with dichloromethane to produce a two‐step SCO reminiscent of that seen for 1⋅4 CH2Cl2. Furthermore, we investigate the light‐induced excited spin state trapping (LIESST) effect on 1⋅4 CH2Cl2 and 1⋅CH2Cl2 and observe partial LIESST activity for the former and no activity for the latter.</div>
</front>
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Thermal‐ and Light‐Induced Spin Crossover in a Guest‐Dependent Dinuclear Iron(II) System

Thermal‐ and Light‐Induced Spin Crossover in a Guest‐Dependent Dinuclear Iron(II) System

Source :

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri