Methanol‐Induced Crystallization of Chiral Hybrid Manganese (II) Chloride Single Crystals for Achieving Circularly Polarized Luminescence and Second Harmonic Generation

Advanced Optical Materials, Год журнала: 2023, Номер 12(2)

Опубликована: Авг. 17, 2023

Abstract Chiral hybrid Mn (II)‐based halides have attracted great interest in the optoelectronic field due to their low cost, non‐toxicity, abundant structural diversity, and excellent photoluminescence, chiroptical, nonlinear optical characteristics. Here, chiral hybrids (R/S‐MBA)MnCl 3 ·CH OH (MBA = C 6 H 5 CH(CH )NH + ) (R/S‐NPA)Cl·H 2 O (R, S‐NPA)Cl (NPA 10 7 single crystals are successfully obtained using methanol (CH OH) as an induced‐crystallization reagent by slow evaporation method. Interestingly, with obvious circular dichroism (CD) characteristics exhibit strong red emission originating from d‐d transition of 2+ cation, while (R/S‐NPA) Cl·H blue organic NPA group. Based on space group P 1 (no.4), show circularly polarized luminescence (CPL) a relatively high dissymmetry factor ( g lum value, which is equivalent that reported metal halides. Also, second harmonic generation (SHG) response. This work not only deepens understanding role methanol‐induced crystallization improving quality growth habits halide crystals, but also provides guidance for further design, crystal growth, applications multi‐functional materials.

Язык: Английский

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Room Temperature Phosphorescence in Chiral 0D Zn(II) Metal Halide Crystals for Multiple Anti‐Counterfeiting

Advanced Optical Materials, Год журнала: 2023, Номер 12(5)

Опубликована: Ноя. 13, 2023

Abstract The development of metal halides that enable multiple information storage and cryptographic security is highly desirable but remains a challenge. Here, pair 0D Zn(II) halide enantiomers ZnCl 2 ·R/S‐2‐MP with excitation wavelength‐dependent emission room temperature phosphorescence properties are reported. Organic ligands via N─H···Cl hydrogen bonding induce structural chirality. In order to stabilize the triplet state exciton achieve excellent photophysical properties, organic combine halogens promote emission. differences between ·R‐2‐MP ·S‐2‐MP analyzed in depth. Furthermore, combined femtosecond transient absorption (fs‐TA) results, long lifetimes may originate from due synergistic effect components inorganic halides. design strategy advanced anticounterfeiting technology further extended.

Язык: Английский

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Family of Chiral Ferroelectric Compounds with Widely Tunable Band Gaps

Chemistry of Materials, Год журнала: 2024, Номер 36(4), С. 1891 - 1898

Опубликована: Янв. 10, 2024

Intense research activities have been exploring the possibility of harnessing solar energy via photovoltaic and photocatalytic applications ferroelectric materials using built-in electric field for an efficient separation photoexcited charge carriers. However, one most important bottlenecks in these efforts is to find ferroelectricity suitably low-band-gap harvesting a sizable part spectrum, with known having band gaps larger than 2.5 eV. In present work, we show that chiral polar compound, (R-/S-MBA)2CuCl4, MBA = α-methyl benzylamine, also its ligand-to-metal transfer (LMCT) gap (∼2.53 eV) can be systematically decreased substitution Cl– Br– forming solid solution (R-/S-MBA)2CuCl4–xBrx. These compounds retain their state until x 2 reach significantly low ∼2.09 eV (R-/S-MBA)2CuCl2Br2, which smallest reported so far among layered hybrid materials. We elucidate origin reduction other changes electronic structure help state-of-the-art calculations. Chiral ferroelectrics constitute interesting class materials, being able discriminate between electron hole transports, while chirality may ability up- down-spin transports.

Язык: Английский

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Manipulating Chiroptical Activities in 0D Chiral Hybrid Manganese Bromides by Solvent Molecular Engineering

Small, Год журнала: 2024, Номер unknown

Опубликована: Май 20, 2024

Abstract 0D hybrid metal halides (0D HMHs) with fully isolated inorganic units provide an ideal platform for studying the correlations between chiroptical activities and crystal structures at atomic levels. Here, through incorporation of different solvent molecules, a series chiral manganese bromides ( RR/SS ‐C 20 H 28 N 2 ) 3 MnBr 8 ·2X (X = C 5 OH, CH or O) are synthesized to elucidate their properties. They show negligible circular dichroism signals Mn absorptions due 2v ‐symmetric [MnBr 4 ] 2− tetrahedra. However, they display distinct circularly polarized luminescence (CPL) continuously increased asymmetry factors g lum from 10 −4 OH) −3 O). The value is structurally revealed originate enhancement 2‐ tetrahedral bond‐angle distortions, presence molecules. Furthermore, )MnBr ·H O enantiomers larger distortions tetrahedra based on hydrobromic acid‐induced structural transformation ·2H enantiomers. Therefore, such exhibit enhanced CPL | up 1.23 × −2 . This work provides unique insight into enhancing in HMH systems.

Язык: Английский

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Solvent-induced structural regulation and luminescence switch of hybrid copper(I) halides for encryption and anti-counterfeiting applications

Chemical Communications, Год журнала: 2024, Номер 60(68), С. 9034 - 9037

Опубликована: Янв. 1, 2024

Copper( i ) halides with different polyhedron units were obtained via solvent volatilization, showing consecutive structural evolution and photoluminescence tuning.

Язык: Английский

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