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Article
Chemistry, Organic
Kenta Suzuki et al.
Summary: In order to investigate the effects of substituents on the helically fused anthracene system, bulky phenyl groups were introduced at sterically crowded positions. Three derivatives were synthesized and analyzed. The results showed that the helical structures expanded in the order of steric size of the substituents. The substituent effects on the optical and chiroptical properties were relatively small.
Article
Chemistry, Multidisciplinary
Yun-Jia Shen et al.
Summary: A novel chiral nanographene EP9H with a pentadecabenzo[9]helicene core fragment was synthesized and its helical structure was confirmed by single-crystal X-ray diffraction. EP9H exhibited fluorescence emission in the near infrared region with a medium quantum yield. Cyclic voltammetry showed its seven quasi-reversible redox states, and enantiopure EP9H showed distinct CD signals in a broad spectral range. Compared to reported small organic molecules, EP9H displayed outstanding |g(lum)| value and B-CPL.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Patricia Izquierdo-Garcia et al.
Summary: This study compares the properties of three helical bilayer nanographenes with different helicenes, and finds that the length of the helicene has a significant impact on their properties. A shorter helicene length leads to stronger electron donor character and greater optical properties in [9]HBNG.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Review
Chemistry, Medicinal
Matteo Cei et al.
Summary: In this short review, the authors collected the dissymmetry factors associated with the first Cotton effect of the ECD spectrum for 170 [n]-helicenes. They found reasonable correlations between luminescence and absorption, suggesting similarity in the stereochemistry of the ground and emitting excited states for most helicenes. These results can be helpful in rationalizing chiroptical data and designing new helicene structures with desired CPL properties.
Review
Chemistry, Physical
Xu-Man Chen et al.
Summary: Circularly polarized luminescence is an important optical property that combines chirality and luminescence in molecular and supramolecular systems. Recently, tunable circularly polarized luminescent supramolecular systems have emerged as promising materials for applications such as smart displays and optical data storage. Non-covalent interactions in supramolecular systems offer various opportunities for regulating circularly polarized luminescence using stimuli, while media modulation methods have been introduced to ensure tunable emission.
Article
Chemistry, Multidisciplinary
Juraj Malincik et al.
Summary: We have successfully synthesized a helicene carbon nanohoop with a unique structure and characterized its properties using NMR, MS, and X-ray analysis. The helicene carbon nanohoop exhibits chiroptical properties and configurational stability typical for higher helicenes, and also shows pronounced circular dichroism and circularly polarized luminescence.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Review
Chemistry, Multidisciplinary
Wen-Wen Yang et al.
Summary: This review describes the recent advances and challenges in the design and synthesis of representative multiple heterohelicenes and their corresponding applications in chiral materials.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Kazuteru Usui et al.
Summary: A study investigated the chiral properties of a compound with organic molecules and enantiomeric structures, revealing that the oxidation of a phosphino group to a phosphine oxide induces a circularly polarized luminescence (CPL) response. The phosphine oxide showed a better CPL response, possibly due to structural changes in the interior of the helicene helix.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Masashi Hasegawa et al.
Summary: In this study, chiral macrocyclic dimers, trimers, and tetramers composed of paraphenylene and tethered binaphthyl were synthesized and their molecular structures and chiroptical properties were investigated. It was found that these compounds have multiple twisted molecular structures and exhibit large epsilon values in their UV-vis absorption spectra. Furthermore, due to their shape-persistent ring structure and tethering with -OCH2CH2O-, they demonstrate high fluorescence quantum yields and brightness in circularly polarized luminescence.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Sandra Miguez-Lago et al.
Summary: In this study, a novel superhelicene structure with near-infrared circularly polarized luminescence and good photoluminescence performance was described. Compared to similar structures reported previously, this superhelicene exhibits higher luminescence efficiency and brightness.
Review
Materials Science, Multidisciplinary
Yadong Zhang et al.
Summary: Due to their magnetic photophysical properties, circularly polarized luminescence (CPL) materials have attracted significant interest. This review provides a comprehensive overview of this field, including theory, experiments, and categorization of CPL-active materials. It also discusses the factors influencing the dissymmetry factor and luminescence efficiency, as well as the opportunities and challenges for enhancing both factors.
Review
Chemistry, Physical
Masashi Hasegawa et al.
Summary: This paper provides an overview of a variety of circularly polarized luminescent emitters based on chiral macrocycles, focusing on the relationship between molecular structure, symmetry, and CPL properties. It is hoped that this review will contribute to the development of functional materials of these exotic organic CPL emitters.
Review
Chemistry, Multidisciplinary
Tadashi Mori
Summary: This review focuses on the chiroptical properties of multiple helicenes, with an emphasis on the impact of the arrangement of multiple helices on the chiroptical responses. Although the number of multiple helicenes reported is limited, insights into the design principle for advanced chiroptical materials through the proper arrangement of multiple helices are provided.
Review
Chemistry, Multidisciplinary
Chengxi Li et al.
Summary: Upconverted circularly polarized luminescence (UC-CPL) combines photon upconversion (UC) and circularly polarized luminescence (CPL), showing great performance and potential applications in various fields. It can flexibly build systems with distinct properties.
Article
Chemistry, Multidisciplinary
Hiromu Kubo et al.
Summary: A newly designed and synthesized helicene with high fluorescence quantum yield and circularly polarized luminescence properties showed solvatofluorochromism while maintaining good CPL performance.
Article
Chemistry, Multidisciplinary
Yuki Nojima et al.
Summary: This study synthesized double-twisted cyclic binaphthyls with a tightly constrained stereogenic figure-eight geometry. X-ray analysis and DFT calculations revealed that short linkage forces a small dihedral angle between two naphthalenes, resulting in increased g(lum) values in CPL. Experimental findings were in line with TD-DFT calculations, indicating transannular interactions and extensive delocalization in the figure-eight pi-core, leading to elongation of the magnetic transition dipole moment and significant increases in g(lum) values.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Optics
Keiichiro Toda et al.
Summary: The text discusses a supersensitive QPI technique that expands the dynamic range through a combination of wavefront shaping and dark-field QPI techniques. Experimental results show that this technique can improve the sensitivity of QPI and is useful for mid-infrared photothermal QPI.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Review
Chemistry, Multidisciplinary
Lewis E. MacKenzie et al.
Summary: This review discusses the challenges and potential of using lanthanide-based, circularly polarized luminescent (CPL) security inks, including their photophysical properties, technological advances, and candidate discussion. These security inks may become important elements in global commerce and security in the future.
NATURE REVIEWS CHEMISTRY
(2021)
Article
Chemistry, Organic
Fulin Zhou et al.
Summary: The synthesis of a structurally unusual triple oxa[7]helicene was disclosed in this study, showing an improved luminescence dissymmetry factor (g(lum) value compared to double oxa[7]helicene. This exemplifies the potential of the helicene subunit multiplication approach to enhance the g(lum) of heterohelicenes.
Article
Chemistry, Multidisciplinary
Juntaro Nogami et al.
Summary: In this article, perfectly diastereo- and enantiocontrolled catalytic synthesis of a cycloparaphenylene with four helical and two planar chiralities showing good chiroptical responses as chiral organic molecules was achieved. The importance of the highly symmetric multiply helical structure in the cylindrical axis in obtaining good chiroptical responses was established through experimental and theoretical studies.
Article
Chemistry, Organic
Hiromu Kubo et al.
Article
Chemistry, Multidisciplinary
Cedric Schaack et al.
CHEMISTRY-A EUROPEAN JOURNAL
(2019)
Article
Chemistry, Multidisciplinary
Antoine Robert et al.
CHEMISTRY-A EUROPEAN JOURNAL
(2019)
Review
Chemistry, Multidisciplinary
Wen-Long Zhao et al.
CHEMICAL COMMUNICATIONS
(2019)
Article
Chemistry, Physical
Hiroki Tanaka et al.
JOURNAL OF PHYSICAL CHEMISTRY A
(2018)
Article
Chemistry, Multidisciplinary
Hiroki Tanaka et al.
COMMUNICATIONS CHEMISTRY
(2018)
Review
Chemistry, Physical
Hiroki Tanaka et al.
Article
Chemistry, Multidisciplinary
Tomoka Hosokawa et al.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2017)
Review
Chemistry, Multidisciplinary
Marc Gingras
CHEMICAL SOCIETY REVIEWS
(2013)
Article
Chemistry, Multidisciplinary
Anne-Catherine Bedard et al.
CHEMISTRY-A EUROPEAN JOURNAL
(2013)
Article
Chemistry, Physical
Yoshito Nakai et al.
JOURNAL OF PHYSICAL CHEMISTRY A
(2012)
Article
Chemistry, Multidisciplinary
Takahiro Kaseyama et al.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2011)
Article
Chemistry, Organic
R El Abed et al.
SYNTHESIS-STUTTGART
(2004)
Article
Chemistry, Organic
DC Harrowven et al.
TETRAHEDRON LETTERS
(2002)
