Magneto‐Chiral Dichroism of Chiral Lanthanide Complexes in the Context of Richardson’s Theory of Optical Activity DOI Open Access

Langit Cahya Adi,

Oliver G. Willis, Alessio Gabbani

et al.

Angewandte Chemie, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 7, 2024

Abstract Here we report on the Magneto‐Chiral Dichroism (MChD) detected through visible and near‐infrared light absorption of two enantiomeric pairs Er III Tm chiral complexes featuring a propeller‐like molecular structure. The magnetic properties show typical features isolated paramagnetic ions associated with 4 I 15/2 3 H 6 ground state terms. MChD spectroscopy shows high g dissymmetry factors ca. 0.12 T −1 0.05 ( =4.0 K B =1.0 T) for , respectively, magnetic‐dipole allowed 13/2 ← 5 transitions. signals were up to room temperature under fields 5.0 T. For first time, results are discussed in context Richardson theory lanthanide optical activity provide clear indications strongest MChD‐active electronic transitions complexes.

Language: Английский

Strategies for the enhancement of CPL properties DOI
Madiha Saqlain,

Hafiz Muhammad Zohaib,

Samina Qamar

et al.

Coordination Chemistry Reviews, Journal Year: 2023, Volume and Issue: 501, P. 215559 - 215559

Published: Nov. 24, 2023

Language: Английский

Citations

23
Enhancement of Magneto-Chiral Dichroism Intensity by Chemical Design: The Key Role of Magnetic-Dipole Allowed Transitions DOI

Chong-Yang Li,

Langit Cahya Adi,

Kévin Paillot

et al.

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(24), P. 16389 - 16393

Published: June 7, 2024

Here we report on the strong magneto-chiral dichroism (MChD) detected through visible and near-infrared light absorption up to 5.0 T {Er5Ni6} metal clusters obtained by reaction of enantiopure chiral ligands NiII ErIII precursors. Single-crystal diffraction analysis reveals that these compounds are 3d–4f heterometallic clusters, showing helical chirality. MChD spectroscopy a high gMChD dissymmetry factor ca. 0.24 T–1 (T = 4.0 K, B 1.0 T) for 4I13/2 ← 4I15/2 magnetic-dipole allowed electronic transition centers. This record value is 1 or 2 orders magnitude higher than d–d transitions ions others f–f electric-dipole induced These findings clearly show key role have in rational design lanthanide systems MChD.

Language: Английский

Citations

11
Magneto-Chiral Dichroism in a One-Dimensional Assembly of Helical Dysprosium(III) Single-Molecule Magnets DOI

Maria Sara Raju,

Kais Dhbaibi, Maxime Grasser

et al.

Inorganic Chemistry, Journal Year: 2023, Volume and Issue: 62(43), P. 17583 - 17587

Published: Oct. 19, 2023

Here we report magneto-chiral dichroism (MChD) detected through visible and near-infrared light absorption of a chiral dysprosium(III) coordination polymer. The two enantiomers [DyIII(H6(py)2)(hfac)3]n [H6(py)2 = 2,15-bis(4-pyridyl)ethynylcarbo[6]helicene; hfac- 1,1,1,5,5,5-hexafluoroacetylacetonate], where the chirality is provided by functionalized helicene ligand, were structurally, spectroscopically, magnetically investigated. Magnetic measurements reveal slow relaxation magnetization, with differences between enantiopure racemic systems rationalized on basis theoretical calculations. When complexes are irradiated unpolarized in magnetic field, they exhibit multiple MChD signals associated f-f electronic transitions DyIII, thus providing coexistence MChD-active absorptions single-molecule-magnet (SMM) behavior. These findings clearly show potential that rationally designed SMMs have enabling optical readout memory MChD.

Language: Английский

Citations

11
Clustering‐Triggered Emission Liquid Crystalline Polymer Bearing Cholesterol: Tunable Circularly Polarized Luminescence and Room‐Temperature Phosphorescence DOI

Mengdie Zhou,

Jiafan Zhang, Yueyue Chen

et al.

Macromolecular Rapid Communications, Journal Year: 2023, Volume and Issue: 44(24)

Published: Oct. 4, 2023

Circularly polarized luminescence (CPL) materials with clustering-triggered emission (CTE) characteristic have gradually attracted attention for their unique photophysical properties. However, the majority of reported clusteroluminogens lack chirality and exhibit heterogeneity, making it challenging to achieve a well-defined helical structure necessary efficient CPL high dissymmetry factor (glum ). In this paper, chiral liquid crystals are constructed obtain CTE-based glum values. Side chain crystal polymer PM6Chol bearing cholesterol designed synthesized. PM6Chol-coated film thermal-treated also successfully prepared by different film-forming methods. Both films inherit CTE show excitation wavelength-dependent luminescent behavior. two phase structures, being bilayer smectic C an achiral A phase. Attributed arrangement cholesterol, emits values up 1.0 × 10-1 . For film, no signal is detected due absence structure. shows obvious room-temperature phosphorescence 2.0 s afterglow 23.9 ms lifetime.

Language: Английский

Citations

8
Synthesis, photophysical, biological and computational investigations of samarium (III) complexes with 1-(4-ethoxy-2-hydroxyphenyl)ethanone (EHPE) for application in display devices DOI

Aarti Khatkar,

Rajesh Kumar, Suman Lata

et al.

Journal of Molecular Structure, Journal Year: 2024, Volume and Issue: 1318, P. 139266 - 139266

Published: July 14, 2024

Language: Английский

Citations

2
Delayed Fluorescence and Amplified Chirality via Modified Substitution Position for Deep-red Circularly Polarized Organic Light Emitting-diodes DOI Creative Commons
Lixun Zhu, Dan Liu, Kaiwen Wu

et al.

Published: May 14, 2024

Developing easily accessible deep-red/near-infrared circularly polarized emitters for practical organic light-emitting diodes remains a significant challenge. Here, strategy has been proposed developing deep-red delayed fluorescent based on novel chiral acceptor platform. By changing triphenylamine (TPA) substitution position from para to meta, R/S-M-TBBTCN demonstrated thermally activated fluorescence (TADF) properties with lifetime of 6.6 μs that R/S-P-TBBTCN doesn’t have. Furthermore, showed 20 nm red-shift in emission and 10-fold enhancement asymmetry factor (glum), compared R/S-P-TBBTCN. The solution-processed nondoped (CP-OLEDs) R-M-TBBTCN display 2.2% external quantum efficiency.

Language: Английский

Citations

1
Magneto‐Chiral Dichroism of Chiral Lanthanide Complexes in the Context of Richardson’s Theory of Optical Activity DOI

Langit Cahya Adi,

Oliver G. Willis, Alessio Gabbani

et al.

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 7, 2024

Abstract Here we report on the Magneto‐Chiral Dichroism (MChD) detected through visible and near‐infrared light absorption of two enantiomeric pairs Er III Tm chiral complexes featuring a propeller‐like molecular structure. The magnetic properties show typical features isolated paramagnetic ions associated with 4 I 15/2 3 H 6 ground state terms. MChD spectroscopy shows high g dissymmetry factors ca. 0.12 T −1 0.05 ( =4.0 K B =1.0 T) for , respectively, magnetic‐dipole allowed 13/2 ← 5 transitions. signals were up to room temperature under fields 5.0 T. For first time, results are discussed in context Richardson theory lanthanide optical activity provide clear indications strongest MChD‐active electronic transitions complexes.

Language: Английский

Citations

1
Temperature-dependent NIR-CPL spectra of chiral Yb(III) complexes DOI Creative Commons
Annika Sickinger,

Maxime Grasser,

Bruno Baguenard

et al.

Published: Nov. 30, 2023

Chiral, enantiopure Yb(III) complexes are able to emit circularly polarized luminescence (CPL) in the near infrared (NIR) wavelength region, quantified by dissymmetry factor (glum). Due crystal field splitting (CFS), excited state 2F5/2 consists of three mj' sublevels, which populated accordance with Boltzmann distribution. Consequently, room temperature CPL spectra sum various - either positive or negative – contributions, that practically impossible quantify. Thanks use an advanced setup enabling measurements over a range temperatures (300 4 K), interrelation CFS, glum and was demonstrated on example pair com-plexes. It thereby confirmed each mJ’ sublevel gives independent contribution overall spectrum. Hence, chiral lanthanide were found be indeed strongly temperature-dependent, as is factor, consequence variation thermal population. These results additional-ly interpreted framework multireference wave-function calculations.

Language: Английский

Citations

1
Magneto‐Chiral Dichroism of Chiral Lanthanide Complexes in the Context of Richardson’s Theory of Optical Activity DOI Open Access

Langit Cahya Adi,

Oliver G. Willis, Alessio Gabbani

et al.

Angewandte Chemie, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 7, 2024

Abstract Here we report on the Magneto‐Chiral Dichroism (MChD) detected through visible and near‐infrared light absorption of two enantiomeric pairs Er III Tm chiral complexes featuring a propeller‐like molecular structure. The magnetic properties show typical features isolated paramagnetic ions associated with 4 I 15/2 3 H 6 ground state terms. MChD spectroscopy shows high g dissymmetry factors ca. 0.12 T −1 0.05 ( =4.0 K B =1.0 T) for , respectively, magnetic‐dipole allowed 13/2 ← 5 transitions. signals were up to room temperature under fields 5.0 T. For first time, results are discussed in context Richardson theory lanthanide optical activity provide clear indications strongest MChD‐active electronic transitions complexes.

Language: Английский

Citations

0