High‐T_c Enantiomeric Ferroelectrics Based on Homochiral Dabco‐derivatives (Dabco=1,4‐Diazabicyclo[2.2.2]octane)

Abstract

1,4‐Diazabicyclo[2.2.2]octane (dabco) and its derivatives have been extensively utilized as building units of excellent molecular ferroelectrics for decades. However, the homochiral dabco‐based ferroelectric remains a blank. Herein, by adding a methyl (Me) group accompanied by the introduction of homochirality to the [H2dabco]2+ in the non‐ferroelectric [H2dabco][TFSA]2 (TFSA=bis(trifluoromethylsulfonyl)ammonium), we successfully designed enantiomeric ferroelectrics [R and S‐2‐Me‐H2dabco][TFSA]2. The two enantiomers show two sequential phase transitions with transition temperature (Tc) as high as 405.8 K and 415.8 K, which is outstanding in both dabco‐based ferroelectrics and homochiral ferroelectrics. To our knowledge, [R and S‐2‐Me‐H2dabco][TFSA]2 are the first examples of dabco‐based homochiral ferroelectrics. This finding opens an avenue to construct dabco‐based homochiral ferroelectrics and will inspire the exploration of more eminent enantiomeric molecular ferroelectrics.

Synthesis, Characterization, and Optical Properties of New Organic–Inorganic Hybrid Perovskites [(NH3)2(CH2)3]CuCl4 and [(NH3)2(CH2)4]CuCl2Br2

“…Perovskites collect characteristics of both inorganic and organic: chemical tuning of their optoelectronic properties, minimal‐temperature solution‐based organic deposition remembrance. [ 7–9 ]…”

Design, synthesis and characterization of novel Ni(II) and Cu(II) complexes as antivirus drug candidates against SARS-CoV-2 and HIV virus

“…The structures were solved by direct methods and refined by full-matrix least-square calculations with the SHELXL-2018/3 software package [20] . All non-hydrogen atoms were refined anisotropically, and all hydrogen atoms on carbon were placed in calculated position, guided by difference maps and refined isotropically [21] . The molecular and crystal structures were plotted using ORTEP [22] , PLATON, Mercury [23] and Diamond 3.2 k [24] programs.…”

Hydrogen‐Bonded Engineering Enhancing Phase Transition Temperature in Molecular Perovskite Ferroelastic

“…As the extensively studied spherical model dabco, [ 27‐29 ] it is desirable for constructing switching materials through conformational transformations. Previously, we reported a switching dielectric material (H 2 dabco)Rb[BF 4 ] 3 , [ 30 ] however, its ordered state is crystallized in a cubic system state.…”