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<p>Two-dimensional inorganic molecular crystals (2D IMCs) represent a novel class of layered materials constructed from inorganic molecules through weak intermolecular interactions. Benefiting from their “LEGO-like” modular assembly nature, we intentionally design a 2D IMC, SbI<sub>3</sub>•(S<sub>7</sub>N)<sub>3</sub>, which exhibits high structural stability, experimental feasibility, and a distinctive breathing kagome-like lattice characteristic. The 2D SbI<sub>3</sub>•(S<sub>7</sub>N)<sub>3</sub> exhibits the coexistence of an in-plane Y-type noncollinear antiferromagnetic (AFM) ground state and an out-of-plane electric dipole moment. The AFM ordering originates from the N and its neighboring S atoms within the S<sub>7</sub>N molecule unit, whereas the out-of-plane polarization arises from the intrinsic polarity of the S<sub>7</sub>N and SbI<sub>3</sub> molecules. Due to its <i>P</i>3<i>m</i>1 space group, the intrinsic in-plane dipole moments of the S<sub>7</sub>N molecules cancel each other exactly. Remarkably, the application of an in-plane electric field can rotate the molecule ordering of S<sub>7</sub>N rings to break the spatial inversion symmetry, thereby inducing a spontaneous ferroelectric polarization and switching the magnetic ground state from the AFM to ferromagnetic (FM). This work not only identifies 2D IMC SbI<sub>3</sub>•(S<sub>7</sub>N)<sub>3</sub> as a promising multiferroic material by precisely choosing building blocks, but also advances the exploration of coupled collective orders in 2D IMCs.</p>

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Coexistence of magnetism and ferroelectricity in the 2D inorganic molecular crystal SbI3•(S7N)3

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月21日

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  • Jianpei Xing,
  • Ying Zhao,
  • Li Sun,
  • Ming Xu,
  • Xue Jiang,
  • Jijun Zhao

摘要

Two-dimensional inorganic molecular crystals (2D IMCs) represent a novel class of layered materials constructed from inorganic molecules through weak intermolecular interactions. Benefiting from their “LEGO-like” modular assembly nature, we intentionally design a 2D IMC, SbI3•(S7N)3, which exhibits high structural stability, experimental feasibility, and a distinctive breathing kagome-like lattice characteristic. The 2D SbI3•(S7N)3 exhibits the coexistence of an in-plane Y-type noncollinear antiferromagnetic (AFM) ground state and an out-of-plane electric dipole moment. The AFM ordering originates from the N and its neighboring S atoms within the S7N molecule unit, whereas the out-of-plane polarization arises from the intrinsic polarity of the S7N and SbI3 molecules. Due to its P3m1 space group, the intrinsic in-plane dipole moments of the S7N molecules cancel each other exactly. Remarkably, the application of an in-plane electric field can rotate the molecule ordering of S7N rings to break the spatial inversion symmetry, thereby inducing a spontaneous ferroelectric polarization and switching the magnetic ground state from the AFM to ferromagnetic (FM). This work not only identifies 2D IMC SbI3•(S7N)3 as a promising multiferroic material by precisely choosing building blocks, but also advances the exploration of coupled collective orders in 2D IMCs.