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Abstract
Three new chiral spin crossover (SCO) dinuclear triple helicates of type [Fe2L3](BF4)4 are reported exhibiting a robust magnetic behaviour that is resistant to the effect of temperature scan rate, moisture, and light. The selective formation of racemic aggregates upon crystallization of a solution of the respective racemic complexes was associated with the helical torsion, intermetallic distance and the spatial arrangement of the enantiomers and anions. Torsional stress and hydrogen bonding interactions were related to the potential spring-like movement inherent to helically chiral systems as well as to the efficacy of cooperativity transmission. These unique structural dynamics were correlated to the display of a chirality-dependent semi-abrupt profile observed for each enantiopure aggregate. This study highlights how the molecular shape of helically chiral compounds can be altered to modulate the magnetic behaviour towards a robust and near-ambient SCO system.
Supplementary materials
Title
Near-Ambient Temperature Spin Crossover Controlled via the Self-Assembly of Chiral and Racemic Polymorphs in Triazolylimine [Fe2L3](BF4)4 Helicates
Description
Three new chiral spin crossover (SCO) dinuclear triple helicates of type [Fe2L3](BF4)4 are reported exhibiting a robust magnetic behaviour that is resistant to the effect of temperature scan rate, moisture, and light. The selective formation of racemic aggregates upon crystallization of a solution of the respective racemic complexes was associated with the helical torsion, intermetallic distance and the spatial arrangement of the enantiomers and anions. Torsional stress and hydrogen bonding interactions were related to the potential spring-like movement inherent to helically chiral systems as well as to the efficacy of cooperativity transmission. These unique structural dynamics were correlated to the display of a chirality-dependent semi-abrupt profile observed for each enantiopure aggregate. This study highlights how the molecular shape of helically chiral compounds can be altered to modulate the magnetic behaviour towards a robust and near-ambient SCO system.
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