X-shaped Thiadiazole-Containing Double [7]Heterohelicene with Strong Chiroptical Response and π-Stacked Homochiral Assembly

2021 ◽  
Author(s):  
Juan Hong ◽  
xuxian Xiao ◽  
Haoliang Liu ◽  
Lin Fu ◽  
Xin-Chang Wang ◽  
...  
Keyword(s):  
Chiroptical Property

A X-shaped double [7]heterohelicene 1 bearing four thiadiazole units is synthesized by regioselective cyclodehydrogenation. Enantiopure 1 exhibits excellent chiroptical property with an impressive absorption dissymmetry factor of up to 0.027,...

scholarly journals An Unexpected Dual-Emissive Luminogen: Tunable Aggregation-Induced Emission with Cyan-White-Red Colors, Stable Inherent Chirality, and Enhanced Chiroptical Property

2022 ◽  
Author(s):  
Pingwu Du ◽  
Xinyu Zhang ◽  
Huiqing Liu ◽  
Guilin Zhuang ◽  
Shangfeng Yang
Keyword(s):  
Light Emission ◽  
Dual Emission ◽  
Aggregation Induced Emission ◽  
Quenching Effect ◽  
Chiroptical Property ◽  
Synthesis Strategy ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence ◽  
Luminescent Behavior ◽  
High Strain Energy

Herein we report a novel chiral bismacrocycle with unexpected dual emission and tunable aggregation-induced emission colors. A facile four-step synthesis strategy is developed to construct this rigid bismacrocycle, (1,4)[8]cycloparaphenylenophane (SCPP[8]), which possesses a 1,2,4,5-tetraphenylbenzene core locked by two intersecting polyphenylene-based macrocycles. The luminescent behavior of SCPP[8] shows the unique characteristics of both aggregation-caused quenching effect and aggrega-tion-induced emission (AIE) effect, inducing remarkable redshift emission including near white-light emission. SCPP[8] is configurationally stable and possesses a novel shape-persistent bismacrocycle scaffold with a high strain energy (up to 127.83 kcal/mol). In addition, SCPP[8] displays enhanced circularly polarized luminescence properties due to AIE effect.

scholarly journals Chiroptical property enhancement of chiral Eu(III) complex upon association with DNA-CTMA

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Haruki Minami ◽  
Natsumi Itamoto ◽  
Wataru Watanabe ◽  
Ziying Li ◽  
Kazuki Nakamura ◽  
...  
Keyword(s):  
Structural Change ◽  
Quantum Yield ◽  
Functional Properties ◽  
Photophysical Properties ◽  
Luminescent Properties ◽  
Dna Molecule ◽  
Emission Enhancement ◽  
Chiroptical Property ◽  
Potential Applications ◽  
Sensitization Efficiency

Abstract DNA-based materials have attracted much attention due to their unique photo-functional properties and potential applications in various fields such as luminescent and biological systems, nanodevices, etc. In this study, the photophysical properties of a chiral Eu(III) complex, namely (Eu(D-facam)3), within DNA films were extensively investigated. The enhancement of photoluminescence (more than 25-folds increase of luminescence quantum yield) and degree of circularly polarization in luminescence (glum = − 0.6) was observed upon interaction with DNA. Various photophysical analyses suggested that the emission enhancement was mainly due to an increase of the sensitization efficiency (high ηsens) from the ligands to Eu(III) and suppression of the vibrational deactivation upon immobilization onto the DNA molecule. From CD and VCD measurements, it was suggested that the coordination structure of Eu(D-facam)3 was affected by the interaction with DNA, suggesting that the structural change of Eu(D-facam)3 contributed to the improvement of its luminescent properties.

Thermoresponsive On−Off Switching of Chiroptical Property Induced in Poly(4‘-ethynylbenzo-15-crown-5)/α-Amino Acid System

2006 ◽  
Vol 39 (12) ◽  
pp. 4032-4037 ◽  
Author(s):  
Ryosuke Sakai ◽  
Issei Otsuka ◽  
Toshifumi Satoh ◽  
Ryohei Kakuchi ◽  
Harumi Kaga ◽  
...  
Keyword(s):  
Amino Acid ◽  
Acid System ◽  
Chiroptical Property
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