Enantiomeric Hydrogen-bonded Chains Driving Ferroelectric and Nonlinear Optical Behavior

Abstract

Organic multiferroic materials have been widely investigated due to their novel physical properties and broad applications. However, the discovery of organic small-molecular multiferroic compounds is still rare. Herein, based on the chemical design strategy of introducing homochirality, we present a pair of enantiomeric organic small-molecular compounds [HDABCO (1,octonium)][L-and D-MA (malic acid)], which displays high Curie temperatures (T c ) of 409/412 K, superior optoelectronic performance, and unique ferroelectric and ferroelastic nature. In comparison with the reported ferroelectrics with the [HDABCO] + cation chain structure, the enantiomers show a neutral one-dimensional chain, where hydrogen bonds connect [HDABCO] + cations and [MA] − anions. Strikingly, [HDABCO][L-and D-MA] exhibit a large second harmonic generation (SHG) intensity of about 2.46 and 2.53 times that of KH 2 PO 4 (KDP), exceeding those of all the organic ferroelectrics (about 0.2−1 × KDP). With excellent SHG signal and ferroic properties, as well as the merit of low acoustic impedance z 0 matching that of the body and easy processing, [HDABCO][L-and D-MA] are potential candidates for future biocompatible electronic devices with multi-functionality.

Halogenation triggering rules in hybrid materials for fluorescence and dielectric phase transitions

“…[8][9][10][11][12][13][14][15] Among them, the chemical synthesis method of some important materials includes metal-ion replacement and doping, which deduces the regulation of the non-metal; that is, the exploration of the role of halogens in materials synthesis. [16][17][18][19][20][21] This work focuses on this halogenation rule, and there are few reports on the regulation rule. The organic-inorganic hybrid compounds were chosen due to their facile structural design and tunability.…”

Zero‐Dimensional Sn‐Based Enantiomeric Phase‐Transition Materials with High‐Tc and Dielectric Switching

“…[43] In recent years, chiral compounds have become hot spots because of their important applications in chiral recognition materials, and provide opportunities for the research of chirality in life science. [44,45] Structural testing is the most intuitive method to comprehensively analyze crystal compounds from a microscopic perspective. [46][47][48] After several adjustments, the structures of compounds 1-R and 1-S were successfully tested at 293 and 303 K, and the main crystal parameters and bond length data were obtained as shown in Tables S1 and S2 3a and b, the unicellular structure of compounds 1-R and 1-S has an obvious mirror relationship, which is consistent with the results of CD spectrum.…”

“…The CD spectra of compounds 1‐R and 1‐S showed a near‐mirror relationship, revealing the characteristics of the enantiomers [43] . In recent years, chiral compounds have become hot spots because of their important applications in chiral recognition materials, and provide opportunities for the research of chirality in life science [44,45] …”

Chirality Extends Multiple-Channel Bistable Responses in Hybrid Perovskites

“…Multifunctional materials with bistable response in different physical channels have attracted comprehensive attention, because of their potential application in fields of intelligent switches, energy conversion, storage, and processing of multistate information. − As exemplified by a molecular semiconductor based on spiro-biphenalenyl neutral radical, the magneto-optoelectronic bistabilites make it a potential candidate in the field of information processing (writing and reading) . Although bistable response has been widely discovered in ferroics and nonlinear optical materials, − the explosive development of the information world and the increasing diversity of demand pose new challenges to bistable response materials. In this context, great efforts have been devoted to exploring bistable responsive materials that involve multiple physical channels simultaneously for improving application freedom and expanding application areas.…”