Three Properties in One Coordination Complex: Chirality, Spin Crossover, and Dielectric Switching

In the search for multifunctional molecular materials, we designed an enantiopure pair of FeII complexes with chiral, chelating (R)/(S)‐4,5‐pinenepyridyl‐2‐pyrazine ligands exhibiting three inherent physical properties: chirality, spin crossover, and dielectric switching. The geometrical change resu...

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Published inEuropean journal of inorganic chemistry Vol. 2017; no. 25; pp. 3144 - 3149
Main Authors Ru, Jing, Yu, Fei, Shi, Ping‐Ping, Jiao, Cheng‐Qi, Li, Cheng‐Hui, Xiong, Ren‐Gen, Liu, Tao, Kurmoo, Mohamedally, Zuo, Jing‐Lin
Format Journal Article
LanguageEnglish
Published Weinheim Wiley Subscription Services, Inc 07.07.2017
Subjects
Chelation
Chirality
Coordination compounds
Coupling (molecular)
Dielectric properties
Electric potential
Hysteresis
Inorganic chemistry
Iron
Ligand effects
Ligands
Magnetic properties
Multifunctional materials
Physical properties
Spin crossover
Switching
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Summary:In the search for multifunctional molecular materials, we designed an enantiopure pair of FeII complexes with chiral, chelating (R)/(S)‐4,5‐pinenepyridyl‐2‐pyrazine ligands exhibiting three inherent physical properties: chirality, spin crossover, and dielectric switching. The geometrical change resulted in coupling of the spin‐crossover transition at 187 K to dielectric switching. Both compounds were found to display light‐induced spin crossover that was thermally unstable above ca. 40 K. The coupling of two hysteretic properties, electric and magnetic, renders these compounds as potential switching devices. Two enantiomeric pairs of FeII complexes are designed by using related chiral ligands. The geometrical change couples the spin‐crossover transition at 187 K to a dielectric anomaly. The results demonstrate these complexes are multifunctional materials with chirality, spin crossover, and dielectric switching.
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.201700609