The First Chiro‐Inositol Organosilicon Ferroelectric Crystal

Abstract

Organosilicons have been used extensively in aerospace, electronics, food, medicine and other fields, due to their low viscosity, hydrophobicity, corrosion resistance, non-toxic, and physiologically inert features. Despite extensive interest, however, organosilicon ferroelectric crystals have never been found. Here, by using the chemical design strategy, we successfully obtained a molecular ferroelectric D-chiro-inositol-SiMe 3 with polar P4 3 symmetry, whose spontaneous polarization can be electrically switchable on thin film. The introduction of organosilicon groups endows the thin films with excellent softness, ductility and flexibility (extremely low hardness of 72.8 MPa and small elastic modulus of 5.04 GPa) that are desirable for biomedical and humancompatible applications. As the first case of organosilicon ferroelectric crystal to date, this work offers a new structural paradigm for molecular ferroelectrics, and highlights their potential for flexible bio-electronic applications.

High-efficiency deep-red to near-infrared emission from Pt(ii) complexes by incorporating an oxygen-bridged triphenylborane skeleton

“…Organic luminescent materials in the deep-red to near-infrared region have become a hotspot in displays and solid lighting due to their broad applications in night vision displays, information security equipment, photodynamic therapy and organic lightemitting diodes (OLEDs). [1][2][3][4][5][6][7][8][9][10] In the past few decades, a series of highly efficient phosphorescent complexes of iridium (Ir), [11][12][13][14] osmium (Os) [15][16][17][18] and platinum (Pt) [19][20][21][22][23][24][25][26] have been developed by virtue of the heavy atom effect with an intrinsic 100% internal quantum efficiency. However, due to the limitations of the energy gap law and quenching effect in the aggregation state, there are still great difficulties in innovatively developing long-wavelength and high-efficiency near-infrared (NIR) luminescent materials.…”

Phosphorescent Bimetallic C^C* Platinum(ii) Complexes with Bridging Substituted Diphenylformamidinates

“…In some of these complexes intramolecular platinum‐platinum interactions are prevented by spatial separation of the metal atoms. [ 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ] In the case of pyrazolate,[ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 ] amidinate[ 53 , 54 , 55 , 56 ] and similar[ 23 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 ] bridged complexes the intermetallic interactions are enforced, since they lead to a remarkable photoluminescence performance with high efficiencies and short emission lifetimes. In previous studies we showed that the use of N , N’ ‐diphenylformamidinate as a bridging ligand can enable the formation of bimetallic complexes with an unitary quantum yield and by several orders of magnitude shorter radiative decay times than the corresponding monometallic C^C* complexes.…”

High-Tc Single-Component Organosilicon Ferroelectric Crystal Obtained by H/F Substitution

“…Moreover, most of the reported organic ferroelectric crystals belong to certain types of organic molecules containing oxygen and nitrogen. Notably, Zhang et al recently reported a single-component organosilicon ferroelectric D-chiro-inositol-SiMe 3 , 44 which shows excellent thin-film properties with superior softness, ductility, flexibility, and biocompatibility that are desirable for biomedical and human-compatible applications, offering a new structural paradigm for molecular ferroelectrics. As a class of compounds in which organic groups are connected to silicon atoms, organosilicon has the characteristics of a strong filmforming ability, hydrophobicity, corrosion resistance, high-and low-temperature resistance, weather resistance, nontoxicity, odorlessness, physiological inertia, etc.…”

“…Notably, Zhang et al recently reported a single-component organosilicon ferroelectric d -chiro-inositol-SiMe 3 , which shows excellent thin-film properties with superior softness, ductility, flexibility, and biocompatibility that are desirable for biomedical and human-compatible applications, offering a new structural paradigm for molecular ferroelectrics. As a class of compounds in which organic groups are connected to silicon atoms, organosilicon has the characteristics of a strong film-forming ability, hydrophobicity, corrosion resistance, high- and low-temperature resistance, weather resistance, nontoxicity, odorlessness, physiological inertia, etc . − These attributes could bring more application possibilities for molecular ferroelectrics. , Inspired by the H/F substitution methodology (Scheme ), we successfully designed a single-component organosilicon ferroelectric tetrakis­(4-fluorophenylethynyl)­silane (TFPES).…”