Article
Chemistry, Multidisciplinary
Masahito Murai, Mikiya Abe, Soichiro Ogi, Shigehiro Yamaguchi
Summary: We have disclosed a series of stable and one-dimensionally pi-extended carbocations with silicon-bridged diazulenyl-methyl cations. Connecting nonbenzenoid azulenes to a carbocation center at an appropriate position and reinforcing a planar arrangement effectively delocalizes a positive charge over the pi-conjugated skeleton. This study demonstrates the impact of the nonbenzenoid aromatic stabilization of a carbocation and the efficacy of the present design strategy for the construction of a promising pi-extended cationic motif that can form NIR-absorbing and emissive J-aggregates.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Johann Bosson, Geraldine M. Labrador, Celine Besnard, Denis Jacquemin, Jerome Lacour
Summary: By oxidizing tertiary alkyl amines to enamines and further reacting them to form donor-pi-acceptor coupling products, this synthetic approach extends conjugation, resulting in chromophores that absorb intensely in far-red or NIR domains. These chromophores also fluoresce in the NIR region, showing intense ECD properties with a |Delta epsilon| value up to 60 M^-1 cm^-1 around 790 nm.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
Samuel Hruby, Jan Ulc, Ivana Cisarova, Martin Kotora
Summary: The scope of Rh-catalyzed C-C bond cleavage/annulation of biphenylene with various aromatic nitriles was investigated. Further Rh- and Ir-catalyzed C-H bond activation/annulation sequence of the resulting 9-arylphenanthridines with alkynes led to the formation of cationic [4], [5], [6] helical quinolizinium salts. The helical arrangement of these compounds was confirmed by single-crystal X-ray analysis. Most of the prepared quinolizinium salts exhibited fluorescence emission with a maximum wavelength in the range of 525-623 nm and absolute quantum yields up to 25%.
Article
Chemistry, Multidisciplinary
Lucas Frederic, Bibiana Fabri, Laure Guenee, Francesco Zinna, Lorenzo Di Bari, Jerome Lacour
Summary: In this study, tris(arene)-functionalized cationic [4]helicenes are synthesized with full regioselectivity and enantiospecificity using Ir- and Pd-catalysis in essentially one-pot, starting from a trivial precursor (17 examples). The poly-addition of aryl groups improves key optical properties, such as fluorescence quantum yields and lifetimes. Electronic circular dichroism and circularly polarized luminescence signatures are observed up to the far-red domain, particularly with additional arenes prone to aggregation.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Pavol Ondrisek, Margaux Elie, Marion Pupier, Adiran Aguirre, Amalia Poblador-Bahamonde, Celine Besnard, Jerome Lacour
Summary: In this study, the issue of loss of emissive properties in cationic compounds caused by the electron-donating groups (EDGs) is successfully addressed by introducing acetylene derivatives. Interestingly, a general dynamic stereoisomerism phenomenon is observed for the compounds derived from achiral DAOTA cores, attributed to the influence of the geometry of the side chains.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Organic
Juan Ventura, Clara Uriel, Ana M. Gomez, Edurne Avellanal-Zaballa, Jorge Banuelos, Esther Rebollar, Inmaculada Garcia-Moreno, J. Cristobal Lopez
Summary: The presence of F or CN substituents at boron in BODIPYs has a significant impact on their reactivity. Tetramethyl B(CN)2-BODIPYs demonstrated enhanced reactivity in Knoevenagel condensations with aldehydes, while the corresponding BF2-BODIPYs can undergo selective aromatic electrophilic substitution (SEAr) reactions in the presence of the former. These (selective) reactions have been utilized in the synthesis of BODIPY dimers and tetramers with balanced fluorescence and singlet oxygen formation, as well as all-BODIPY trimers and heptamers with potential application as light-harvesting systems.
Article
Chemistry, Multidisciplinary
Dong-Hao Li, Bradley D. Smith
Summary: ICG, a clinically approved near-infrared fluorescent dye, is unstable in water. Deuterated versions of ICG have longer shelf-lives and can be used in medical and clinical procedures. Self-aggregation of ICG promotes photoinduced electron transfer, offering a new paradigm for next-generation photodynamic therapies.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Physical
Ali Suerkan, Recep Isci, Turan Ozturk, Yusuf Yagci
Summary: A donor-acceptor type photoinitiator, DMB-TT-TPA, composed of boron-thienothiophene-triphenylamine, was studied for cationic and radical polymerization. Mono and difunctional monomers were irradiated under a white LED source in the presence of DMB-TT-TPA and DPI. The initiation process was investigated using fluorescence spectroscopy, and the presence of the synthesizer in the polymer structures was confirmed by NMR spectroscopy studies. This study demonstrated the importance of the photoinduced electron transfer process in the initiation of polymerization and the formation of conjugated polymers.
MOLECULAR SYSTEMS DESIGN & ENGINEERING
(2023)
Article
Materials Science, Paper & Wood
Loukia Tsimpouki, Konstantinos Papapetros, Charalampos Anastasopoulos, Labrini Sygellou, Amaia Soto-Beobide, Konstantinos S. Andrikopoulos, George A. Voyiatzis, Georgios Bokias, Joannis K. Kallitsis
Summary: The present work explores the modification of cotton fabrics with water-soluble cationic copolymers for salt-free dyeing applications with reactive dyes. A series of bifunctional water-soluble cationic copolymers were designed through the chemical modification of PVBC with TEAM. The successful cotton modification was verified through characterization techniques, and the modified fabrics showed improved dyeability under eco-friendlier conditions.
Article
Spectroscopy
Giorgia Chinigo, Ana Gonzalez-Paredes, Alessandra Gilardino, Nadia Barbero, Claudia Barolo, Paolo Gasco, Alessandra Fiorio Pla, Sonja Visentin
Summary: In this study, two polymethine dyes based on the benzoindolenine ring were successfully incorporated into solid lipid nanoparticles to improve their solubility and stability in aqueous solutions. The obtained nanoparticles not only preserved the spectroscopic properties of the dyes but also showed good biocompatibility and cellular uptake. The phototoxicity assay revealed that the loaded nanoparticles exhibited higher photoactivity compared to the free dye.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Chemistry, Multidisciplinary
Xiao-Yu Lou, Xiao-Ming Jiang, Bin-Wen Liu, Guo-Cong Guo
Summary: This study demonstrates the successful synthesis of two novel salt-inclusion sulfides using an unusual cationic substitution strategy. The resulting compounds exhibit wide band gaps and high laser-induced damage thresholds, showing promising nonlinear optical properties. This work provides new insights for the design of high-performance NLO materials based on diamond-like structures.
Article
Physics, Condensed Matter
T. A. Zidan, E. M. El-Menyawy, M. M. El-Shabaan
Summary: This study synthesizes azo dye 4-[2(3-acetylphenyl) diazenyl]-3,5-dimethylphenol (ADD) and investigates its structural, linear optical, and non-linear optical properties, as well as the characteristics of the Ag/ADD/p-Si/Al hetero-junction photodiode. The synthesized ADD is analyzed using Fourier transform infrared spectroscopy, nuclear magnetic resonance, X-ray diffraction, and scanning electron microscopy techniques. The linear-optical parameters are calculated from the absorption spectra of ADD thin films, and the non-linear optical parameters are obtained using semi-empirical relations. The ADD thin films show good optical properties for optoelectronic applications. Additionally, the Ag/ADD/p-Si/Al heterojunction photodiode demonstrates good response to different illumination intensities in terms of sensitivity, resistivity, and detectivity.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Chemistry, Physical
Zekun Chen, Fernanda C. Bononi, Charles A. Sievers, Wang-Yeuk Kong, Davide Donadio
Summary: This study presents an approach to predicting UV-visible absorption spectra of solvated aromatic molecules using a combination of machine learning and quantum chemical methods. The results show that a machine learning model, trained on high-level quantum chemical calculations, can accurately predict the line shape of the lowest-energy UV-visible absorption band of related molecules with minimal deviation from experimental spectra. By analyzing the excitation energies, the study reveals that the machine learning models primarily probe the vertical excitations of aromatic molecules by learning their atomic environment, which aligns with the physical origin of the electronic transition.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2022)
Article
Chemistry, Multidisciplinary
Marwa A. El-Sayed, Georgy A. Ermolaev, Kirill V. Voronin, Roman I. Romanov, Gleb I. Tselikov, Dmitry I. Yakubovsky, Natalia V. Doroshina, Anton B. Nemtsov, Valentin R. Solovey, Artem A. Voronov, Sergey M. Novikov, Andrey A. Vyshnevyy, Andrey M. Markeev, Aleksey V. Arsenin, Valentyn S. Volkov
Summary: The study conducted a comprehensive experimental research on the optical properties of chemical-vapor deposited (CVD) monolayer graphene, free from assumptions of additional nano-thick water layers or other media. It was found that there is a slight difference in the optical constants of graphene on different substrates, but they are very close to those of graphite.
Review
Chemistry, Multidisciplinary
Tawfik Khattab, Samir Kamel
Summary: Helicenes are helical-shaped pi-conjugated molecular structures composed of sequential ortho annulated aromatic rings, known for their thermal stability and intrinsic chirality. They are characterized by their distinctive supramolecular structural design and unusual optical characteristics. Helicenes have been widely utilized in various potential applications such as liquid crystals, material dyes, asymmetric synthesis, molecular switches, polymers, photorefractive materials, nanomaterials via self-assembly, biological recognition, photovoltaics, and light-emitting devices.
EGYPTIAN JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Johann Bosson, Geraldine M. Labrador, Celine Besnard, Denis Jacquemin, Jerome Lacour
Summary: By oxidizing tertiary alkyl amines to enamines and further reacting them to form donor-pi-acceptor coupling products, this synthetic approach extends conjugation, resulting in chromophores that absorb intensely in far-red or NIR domains. These chromophores also fluoresce in the NIR region, showing intense ECD properties with a |Delta epsilon| value up to 60 M^-1 cm^-1 around 790 nm.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Pavol Ondrisek, Margaux Elie, Marion Pupier, Adiran Aguirre, Amalia Poblador-Bahamonde, Celine Besnard, Jerome Lacour
Summary: In this study, the issue of loss of emissive properties in cationic compounds caused by the electron-donating groups (EDGs) is successfully addressed by introducing acetylene derivatives. Interestingly, a general dynamic stereoisomerism phenomenon is observed for the compounds derived from achiral DAOTA cores, attributed to the influence of the geometry of the side chains.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Malte Oppermann, Francesco Zinna, Jerome Lacour, Majed Chergui
Summary: This study demonstrates trapping of the high-spin state in iron-based spin-crossover complexes by controlling the chiral configuration. The high-spin-state decay is found to be accompanied by changes in optical activity, reflecting coupling to a symmetry-breaking torsional mode. Diastereoselective ion pairing suppresses vibrational population and increases the high-spin-state lifetime. These findings motivate the synthetic control of torsional modes in iron(II) complexes to manipulate their spin-crossover dynamics as a complementary approach.
Article
Chemistry, Multidisciplinary
Yana Nikolova, Bibiana Fabri, Pau Moneva Lorente, Alejandro Guarnieri-Ibanez, Adiran de Aguirre, Yoshiki Soda, Gennaro Pescitelli, Francesco Zinna, Celine Besnard, Laure Guenee, Dimitri Moreau, Lorenzo Di Bari, Eric Bakker, Amalia Poblador-Bahamonde, Jerome Lacour
Summary: In this study, chiral quinacridines react multiple times with alpha-diazomalonates under Ru-II and Rh-II catalysis, achieving chemo and regioselective insertions of metal carbenes. This versatile method allows for the introduction of mono- or bis-functionalized malonate derivatives, which can be used to tune optical and chemical properties and for cellular bioimaging.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Lucas Frederic, Bibiana Fabri, Laure Guenee, Francesco Zinna, Lorenzo Di Bari, Jerome Lacour
Summary: In this study, tris(arene)-functionalized cationic [4]helicenes are synthesized with full regioselectivity and enantiospecificity using Ir- and Pd-catalysis in essentially one-pot, starting from a trivial precursor (17 examples). The poly-addition of aryl groups improves key optical properties, such as fluorescence quantum yields and lifetimes. Electronic circular dichroism and circularly polarized luminescence signatures are observed up to the far-red domain, particularly with additional arenes prone to aggregation.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Optics
Jeremy R. Rouxel, Benedikt Roesner, Dmitry Karpov, Camila Bacellar, Giulia F. Mancini, Francesco Zinna, Dominik Kinschel, Oliviero Cannelli, Malte Oppermann, Cris Svetina, Ana Diaz, Jerome Lacour, Christian David, Majed Chergui
Summary: Chirality, a structural property of molecules, has significant implications in various fields. A new approach to probe molecular chirality using helical dichroism has been demonstrated on a disordered sample for the first time. By using hard X-rays with spiral Fresnel zone plates, researchers have successfully induced orbital angular momentum (OAM) and obtained helical dichroism spectra of a disordered powder sample, opening up new possibilities for studying the interaction between molecular chirality and OAM of light.
Article
Chemistry, Multidisciplinary
Ke-Feng Zhang, Nidal Saleh, Michal Swierczewski, Arnulf Rosspeintner, Francesco Zinna, Gennaro Pescitelli, Celine Besnard, Laure Guenee, Thomas Burgi, Jerome Lacour
Summary: A chiral bispyrene macrocycle was synthesized for intermolecular excimer fluorescence upon aggregation using a double hydrothiolation method followed by intramolecular oxidation. High stereoselectivity was achieved for the thiol-ene additions under templated conditions. The structural evolution upon aggregation was monitored by ECD/CPL.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Organic
Olivier Viudes, Alejandro Guarnieri-Ibanez, Celine Besnard, Jerome Lacour
Summary: By using electron-rich or electron-poor N-substituted oxazolidines as substrates, it is possible to selectively form either ammonium or oxonium ylides with the presence of ?-imino carbenes. Under dirhodium catalysis (2 mol%), treatment of 5-membered oxazolidine precursors with N-sulfonyl-1,2,3-triazoles allows for the regiodivergent synthesis of either 8-membered 1,3,6- or 1,4,6-oxadiazocines based on the initial N or O reactivity with the carbene.
Article
Chemistry, Multidisciplinary
David Pal, Celine Besnard, Adiran de Aguirre, Amalia I. Poblador-Bahamonde, Gennaro Pescitelli, Jerome Lacour
Summary: Hydrogen bonding plays a significant role in chemical reactions, conformation, and stereochemistry. This study introduces a novel dye, tetranitrofluorenone oximate, which can visually detect hydrogen-bond donating species and quickly determine the strength of hydrogen bonding by monitoring hypsochromic shifts. The molecule also exhibits atropisomeric conformations, and enantiopure bis-thioureas are found to be the most effective hydrogen bond donors for chiral induction, as demonstrated by electronic circular dichroism and time-dependent density functional theory calculations. Furthermore, bis-thioureas are used as chiral reagents in asymmetric 1,3-dipolar cycloadditions, with the electronic circular dichroism sensing of stereoinduction serving as an indirect method to select the most effective hydrogen bond donor for asymmetric synthesis.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
M. Baljozovic, B. Arnoldi, S. Grass, J. Lacour, M. Aeschlimann, B. Stadtmueller, K. -H. Ernst
Summary: It has been shown that electrons interact differently with chiral molecules depending on their polarization. Previous photoemission experiments on enantiomeric pure monolayers of heptahelicene reported opposite asymmetries in spin polarization, attributed to the chirality-induced spin selectivity effect. However, these experiments lack the necessary angular and energy resolution to understand the mechanism of this phenomenon. To fill in the gaps, a detailed spin- and angle-resolved photoemission spectroscopy study of heptahelicene layers on a Cu(111) substrate was conducted, but no chirality-induced spin asymmetry in photoemission was observed. Possible reasons for the absence of spin-dependent electron transmission signatures through the chiral molecular layer are briefly discussed.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Pragya Verma, Christoph Nancoz, Johann Bosson, Geraldine M. Labrador, Jerome Lacour, Eric Vauthey
Summary: By combining ultrafast time-resolved fluorescence and transient electronic absorption, we investigated the stereoselectivity in the static stage of photoinduced electron transfer (ET). Our results show that the quenching dynamics for different diastereomeric pairs are the same, regardless of solvent polarity.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Inorganic & Nuclear
Alexandre Homberg, Federica Navazio, Antoine Le Tellier, Francesco Zinna, Alexandre Fuerstenberg, Celine Besnard, Lorenzo Di Bari, Jerome Lacour
Summary: This research successfully synthesized a series of chiral amide-based bis-pyridine substituted polyether macrocycles through a simple two-step synthesis protocol, with one ligand showing efficient complexation with terbium(iii) ions, leading to interesting chiroptical properties observed in absorbance and fluorescence.
DALTON TRANSACTIONS
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
Johann Bosson, Geraldine M. Labrador, Denis Jacquemin, Jerome Lacour
Summary: The intramolecular condensation of ortho substituents of triaryl carbenium ions can lead to the formation of cationic helicenes, which exhibit extended optical properties and intense chiroptical properties that can be tailored in the far red to near infra-red (NIR) spectral windows through orthogonal late-stage functionalization strategies. These molecules have potential applications in material sciences.
MATERIALS TODAY-PROCEEDINGS
(2022)
Review
Chemistry, Multidisciplinary
Yikuan Liu, Xiaona Liu, An Su, Chengtao Gong, Shenwei Chen, Liwei Xia, Chengwei Zhang, Xiaohuan Tao, Yue Li, Yonghe Li, Tulai Sun, Mengru Bu, Wei Shao, Jia Zhao, Xiaonian Li, Yongwu Peng, Peng Guo, Yu Han, Yihan Zhu
Summary: Covalent organic frameworks are crystalline porous materials with designable structures and functions, which can acquire multifunctionalities and have versatile applications in gas separation/storage, catalysis, and optoelectronic devices.
CHEMICAL SOCIETY REVIEWS
(2024)
Review
Chemistry, Multidisciplinary
Heyang Zhang, Jo Vandesompele, Kevin Braeckmans, Stefaan C. De Smedt, Katrien Remaut
Summary: Gene therapy has the potential to revolutionize the treatment of inherited and acquired diseases, but its success rate is currently limited. This review focuses on the obstacles faced by gene therapies in the human body, such as nucleic acid degradation by abundant nucleases, and discusses strategies to reduce degradation and methods to assess nucleic acid integrity.
CHEMICAL SOCIETY REVIEWS
(2024)
Review
Chemistry, Multidisciplinary
Chenxi Duan, Chunming Cui
Summary: Low valent group 14 compounds with diazaborolyl substituents exhibit unique structures and reactivity due to the combination of sigma-electron donation and steric hindrance. The modulation of the HOMO-LUMO gap by the diazaborolyl substituents results in novel reaction patterns in the activation of small molecules and inert chemical bonds.
CHEMICAL SOCIETY REVIEWS
(2024)
Review
Chemistry, Multidisciplinary
David E. Salazar Marcano, Nada D. Savic, Kilian Declerck, Shorok A. M. Abdelhameed, Tatjana N. Parac-Vogt
Summary: Metal-oxo clusters have great potential in various fields and can react with biomolecules, making them promising for applications in disease treatment and energy development. They can also be used in the development of inorganic drugs and bioanalytical tools.
CHEMICAL SOCIETY REVIEWS
(2024)
Review
Chemistry, Multidisciplinary
Lana K. Moree, Logan A. V. Faulkner, James D. Crowley
Summary: In this tutorial review, the general methods for synthesizing heterometallic metallosupramolecular architectures (MSAs), specifically heterometallic cages, are examined. The intrinsic properties and potential applications of these cages as host-guest systems and reaction catalysts are discussed.
CHEMICAL SOCIETY REVIEWS
(2024)
