Citation: Jingsong WANG, Luyao WANG, Jiesheng HU, Yuxiao CHEN, Kaige GAO, Zishuo YAO, Jun TAO. Comparison of homochiral and racemic polymorphs of a spin-crossover iron(Ⅱ) complex[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(11): 2326-2334. doi: 10.11862/CJIC.20260119 shu

Comparison of homochiral and racemic polymorphs of a spin-crossover iron(Ⅱ) complex

Jingsong WANG ¹ ,
Luyao WANG ¹ ,
Jiesheng HU ¹ ,
Yuxiao CHEN ¹ ,
Kaige GAO ² ,
Zishuo YAO ^1,, ,
Jun TAO ^1,,

1.
MOE Key Laboratory of Cluster Science, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
2.
College of Physical Science and Technology, Yangzhou University, Yangzhou, Jiangsu 225009, China

Corresponding author: Zishuo YAO, zishuoyao@bit.edu.cn Jun TAO, taojun@bit.edu.cn
Received Date: 9 April 2026
Revised Date: 31 August 2026

Figures(6)

In this work, a pair of iron(Ⅱ) spin-crossover complexes derived from chiral ligands, [Fe(L-R)(NCS)₂] (1-R; L-R=(R)-N¹,N²-bis(pyridin-2-ylmethyl)propane-1,2-diamine) and [Fe(L-S)(NCS)₂] (1-S; L-S=(S)-N¹,N²-bis(pyridin-2-ylmethyl)propane-1,2-diamine), together with their racemic analogue [Fe(L)(NCS)₂] (1-rac; where L represents an equimolar mixture of L-R and L-S), were synthesized, and the influence of chirality on molecular packing and spin-crossover behavior was investigated. Structural and circular dichroism analyses reveal a hierarchical transfer of chirality from the ligands to the coordination metal centers, which is ultimately amplified into the supramolecular single-crystal architecture. Consequently, 1-R and 1-S crystallize in the enantiomorphic tetragonal space groups P4₁2₁2 and P4₃2₁2, respectively, forming opposite-handed quadruple-helical networks, whereas 1-rac adopts the achiral space group Aea2. Magnetic and calorimetric measurements demonstrate that both enantiopure complexes undergo a complete, reversible one-step SCO transition with T_1/2 (spin-transition temperature) of 158 K. In contrast, 1-rac remains trapped in the high-spin state across the entire investigated temperature range.
- spin crossover,
- iron(Ⅱ) complexes,
- chirality,
- crystal structure,
- magnetic properties
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