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- Title
Constructing Alkyl Chain Modified Fe<sup>II</sup> Spin Crossover Complexes through Complementary Pair Strategy.
- Authors
Peng, Ya‐Lin; Lu, Han‐Han; Shang, Meng‐Jia; Sun, Hui‐Ying; Jiang, Wen‐Jing; Xiao, Jing‐Yi; Liu, Tao; Meng, Yin‐Shan
- Abstract
Four alkyl chains and cyclohexane modified FeII complexes [Fe(Ln)(L')](ClO4)2⋅solv (n=1, 2, 3, 4) were synthesized and characterized. X‐ray diffraction study showed that these complexes were constituted by asymmetric mononuclear FeII entities, incorporating alkyl‐chain‐modified bppCOOH (2,6‐bis(1H‐pyrazol‐1‐yl)isonicotinic acid) ligands and 6,6"‐2,6‐dimethoxyphenyl‐substituted terpy ligand (L'). Magnetic susceptibility measurements revealed that complexes 1, 2, and 3 were in the high spin state across the measured temperature range, whereas complex 4 displayed an incomplete spin crossover phenomenon, with a transition temperature (T1/2) at 240 K. Investigations into variable‐temperature structure and magneto‐structural correlations revealed that the integration of alkyl‐chain‐modified bipyridyl units fostered the π⋅⋅⋅π intra‐ and intermolecular interactions, contributing to distinct crystal stacking and spatial configurations in complex 4 when compared to its counterparts. These findings underscore the pivotal influence of intramolecular interactions on the FeII spin states and highlight the significance of designing flexible ligands for modulating spin‐crossover characteristics.
- Subjects
SPIN crossover; ISONICOTINIC acid; TRANSITION temperature; MAGNETIC susceptibility; MAGNETIC measurements
- Publication
European Journal of Inorganic Chemistry, 2024, Vol 27, Issue 20, p1
- ISSN
1434-1948
- Publication type
Article
- DOI
10.1002/ejic.202400160