Large Spontaneous Polarization Ferroelectric Property, Switchable Second-Harmonic Generation Responses, and Magnetism in an Fe-Based Compound.

Since the switchable spontaneous polarization of ferroelectric materials endows it with many useful properties such as a large pyroelectric coefficient, switchable spontaneous polarization, and semiconductor, it has a wide range of application prospects, and the research of high-performance molecular ferroelectric materials has become a hot spot. We obtained a 0D organic-inorganic hybrid ferroelectric [(CH ₃ ) ₃ NCH ₂ CH ₂ CH ₃ ] ₂ FeCl ₄ ( 1 ) with well-defined ferroelectric domains and excellent domain inversion and exhibited a relatively large spontaneous polarization ( P _s = 9 μC/m ^-2 ) and a Curie temperature ( T _c ) of 394 K. Furthermore, compound 1 belongs to the non-centrosymmetrical space group Cmc 2 ₁ and has a strong second-harmonic generation signal. Interestingly, we also performed magnetic tests on 1 , which confirmed that it is a magnetic material. This work provides clues for exploring the application of high-performance molecular ferroelectric materials in future multifunctional smart devices.