Article
Chemistry, Organic
Yushi Ohno, Shogo Ando, Daisuke Furusho, Ryoyu Hifumi, Yuuya Nagata, Ikuyoshi Tomita, Shinsuke Inagi
Summary: Here, a facile and selective synthesis of cationic azatriphenylene derivatives was achieved through electrochemical intramolecular cyclization, where the key step involves atom-economical C-H pyridination without a transition-metal catalyst or an oxidant. This proposed strategy provides a practical approach for introducing cationic nitrogen (N (+)) into pi-electron systems, thus expanding the molecular design of N (+)-doped polycyclic aromatic hydrocarbons.
Article
Chemistry, Organic
Yan-Ying Wu, Yi-Lin Wu, Cheng-Lan Lin, Hung-Cheng Chen, Yao-Yuan Chuang, Chih-Hsien Chen, Chih-Ming Chou
Summary: A strategy for the synthesis of dibenz-[a,j]-anthracenes (DBAs) from cyclohexa-2,5-diene-1-carboxylic acids is presented. The method involves sequential C-H olefination, cycloaddition, and decarboxylative aromatization, leading to regioselective ring formation and functional group introduction.
Article
Chemistry, Multidisciplinary
Yimin Liang, Shangshang Wang, Min Tang, Lin Wu, Lifang Bian, Liang Jiang, Zheng-Bin Tang, Jiali Liu, Aocong Guan, Zhichang Liu
Summary: In this study, we describe a one-pot synthesis of benzo[1,2-a:3,4-a':5,6-a'']triazulene (BTA) through a tandem reaction involving Suzuki coupling and Knoevenagel condensation. The resulting compound exhibits excellent stability, fluorescence, and large Stokes shifts. Additionally, its nitrated product, BTA-NO2, demonstrates unique solvatochromic effects and hydrogen-bonding-induced emission transfer.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Organic
Laiyun Zhou, Boming Wu, Yuanyuan Chen, Jianye Gong, Jianguo Wang, Gaole Dai, Chunyan Chi, Qing Wang
Summary: A nitrogenated derivative of Ovalene with all zigzag edges and nitrogen atom doping at the periphery has been successfully developed through one-step nitrogenation of formylbisanthene. These molecules exhibit decreased highest occupied molecular orbital levels, enhanced intermolecular interactions, and reversible acid response due to nitrogen incorporation. Additionally, the aza-ovalene also shows a diatropic ring current along the periphery, providing rare examples of all-zigzag-edged N-polycyclic aromatic hydrocarbons.
Review
Environmental Sciences
Meng Qiao, Weixiao Qi, Huijuan Liu, Jiuhui Qu
Summary: Oxygenated polycyclic aromatic hydrocarbons (OPAHs) have higher concentrations and toxicity in water environments, posing significant ecological risks to surface water ecosystems.
ENVIRONMENT INTERNATIONAL
(2022)
Article
Chemistry, Physical
Thomas Liu, Baptiste Carles, Christine Elias, Claire Tonnele, Daniel Medina-Lopez, Akimitsu Narita, Yannick Chassagneux, Christophe Voisin, David Beljonne, Stephane Campidelli, Loic Rondin, Jean-Sebastien Lauret
Summary: In this study, we conducted single-molecule spectroscopy at cryogenic temperatures to investigate the optical properties of graphene quantum dots (GQDs). We found that temperature has an effect on the spectral characteristics of GQDs, and we used density functional theory calculations to explain these observations. Additionally, we discovered that the vibrational features can serve as a unique fingerprint for identifying GQDs.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Xiushang Xu, Amy L. Vonder Haar, Rengo Yoshioka, Qizheng Zhang, Serhii Vasylevskyi, Andrew J. Musser, Akimitsu Narita
Summary: A benzo[rst]pentaphene derivative, BPP-MeOPA, was synthesized and characterized by NMR and single-crystal X-ray analysis. Investigation of its photophysical properties, including transient absorption spectroscopy, revealed improved absorption and emission features from an S-1 state with excitonic and charge-transfer character by introducing MeOPA groups.
CHEMICAL COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Yusuke Nakakuki, Takashi Hirose, Hikaru Sotome, Min Gao, Daiki Shimizu, Ruiji Li, Jun-Ya Hasegawa, Hiroshi Miyasaka, Kenji Matsuda
Summary: Helically twisted conductive nanocarbon materials are suitable for optoelectronic and electromagnetic molecular devices on the nanometer scale, showing a large effective conjugation length and ultrafast decay dynamics. The extended π-helicenes achieved a large effective conjugation length through helical fusion, leading to an absorption edge in the near-infrared region.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Organic
Xavier Aguilar-Enriquez, Luke P. Skala, William R. Dichtel
Summary: The synthesis of a diol with a nonalternant aromatic core has been successfully achieved, providing a nonalternant isomer of bisanthene suitable for two-dimensional polymerization. Unexpectedly, a Stone-Wales rearrangement of the starting material yielded both an alternant and nonalternant dione, allowing for the divergent synthesis of both products. This study offers a convenient method for accessing functional derivatives of two PAH classes and highlights the importance of careful characterization in multistep synthetic routes.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Engineering, Environmental
Zhiyang Lu, Weijun Tian, Surong Zhang, Meile Chu, Jing Zhao, Bingkun Liu, Kun Yang, Huimin Cao, Zhuo Chen
Summary: This study investigated the spatiotemporal distribution, source, and ecological risk of PAHs and SPAHs in surface sediments in Laizhou Bay. The results showed seasonal differences in concentrations of PAHs and SPAHs and a spatial distribution trend of estuary > coast > offshore. Combustion sources, including petroleum, coal, and biomass, were identified as the main contributors to PAHs and SPAHs. The risk level of PAHs was low-to-moderate, while SPAHs posed a moderate-to-high ecological risk.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Renxiang Liu, Yubin Fu, Fupeng Wu, Fupin Liu, Jin-Jiang Zhang, Lin Yang, Alexey A. Popov, Ji Ma, Xinliang Feng
Summary: The research interest in azulene-embedded polycyclic aromatic hydrocarbons (PAHs) has recently increased. However, the lack of efficient synthetic strategies hinders the investigation of their structure-property relationships and further opto-electronic applications. We report a modular synthetic strategy for diverse azulene-embedded PAHs, which includes non-alternant thiophene-rich PAHs, butterfly- or Z-shaped PAHs bearing two azulene units, and the first example of a two-azulene-embedded double [5]helicene.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Environmental Sciences
Jamie M. Dearnley, Charles Killeen, Rebecca L. Davis, Vince P. Palace, Gregg T. Tomy
Summary: This article reviews the metabolism and toxicity of polycyclic aromatic compounds (PACs) in fish and presents various methods for analyzing metabolite-containing bile. Recent environmental monitoring studies demonstrate the utility of this technique in assessing oil spill pollution, establishing baseline exposure, and evaluating pollution in urban waterways.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Inorganic & Nuclear
Huimin Zhong, Cong Jiang, Jiahui Zou, Guancheng Zhu, Yanyan Huang
Summary: In this study, CeO2-based porous carbonaceous frameworks (CeO2 PCFs) were used as antioxidant nanozymes to scavenge reactive oxygen species and absorb benzo[a]pyrene. CeO2 PCFs exhibited excellent superoxide dismutase-like and catalase-like activity, effectively eliminating superoxide radical, hydroxyl radical, and hydrogen peroxide. The 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) free radical scavenging assay confirmed the free radical scavenging ability of CeO2 PCFs. Furthermore, CeO2 PCFs with large surface area and porous structure efficiently adsorbed benzo[a]pyrene. The designed CeO2 PCFs can serve as new antioxidant nanozymes for scavenging reactive oxygen species and adsorbing polycyclic aromatic hydrocarbons (PAHs).
INORGANIC CHEMISTRY
(2023)
Article
Engineering, Environmental
Jiaxing Lu, Jian Zhang, Huijun Xie, Yuming Jing, Mingde Ji, Zhen Hu
Summary: In this study, a novel wastewater treatment process combining sequencing batch reactor, constructed wetland and microalgal membrane photobioreactor (BCM process) was proposed. The process achieved satisfactory removal of polycyclic aromatic hydrocarbons (PAHs) and their substituted derivatives (SPAHs), and significantly reduced bacterial toxicity and genotoxicity. Microalgae played an important role in ensuring water security.
Editorial Material
Chemistry, Multidisciplinary
Renana Gershoni-Poranne, Alexandra Tsybizova
Summary: Circumcoronene, a highly symmetrical polybenzenoid hydrocarbon, has intrigued organic chemists and materials scientists for decades. Recently, Wu et al. successfully synthesized and isolated crystalline circumcoronene derivatives in solution, confirming the predicted Clar structure. This breakthrough enables the preparation of new polycyclic benzenoid hydrocarbons with multiple K-regions and enhances our knowledge of their chemistry.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Thermodynamics
Jerin John, Purushothaman Nandagopalan, Seung Wook Baek, Sung June Cho
COMBUSTION AND FLAME
(2020)
Article
Chemistry, Applied
Min Sik Kim, Ki Hun Park, Sung June Cho, Eun Duck Park
Summary: The study found that the catalyst preparation method has a significant impact on the catalytic activity of Fe-ZSM-5 for the partial oxidation of methane with H2O2 in an aqueous phase. The aqueous phase ion-exchange method demonstrated the best results, producing isolated or oligonuclear extra-framework Fe species with the highest catalytic activity.
Article
Chemistry, Applied
Hongjun Park, Jisuk Bang, Seung Won Han, Raj Kumar Bera, Kyoungsoo Kim, Ryong Ryoo
Summary: This study demonstrated the synthesis of ordered microporous carbons using organic solvents instead of carbon source gases with Ca2+ ion-exchanged Y and beta zeolites. The approach of simultaneously generating H2O and olefins without high-pressure gas cylinders showed promise for the synthesis of zeolite-templated carbons. The method provided a facile way to produce high quality ZTCs with excellent micropore orders and high specific capacitances for supercapacitor applications.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Physical
Hongjun Park, Hanyoung Park, Jeong-Chul Kim, Minkee Choi, Jeong Young Park, Ryong Ryoo
Summary: By developing a new synthesis method, a mesoporous MFI zeolite with silanol nests was successfully prepared, leading to a Pt3Y catalyst with remarkably long catalytic lifetime and high propane conversion and propylene selectivity in propane dehydrogenation reaction.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Seung Won Han, Hongjun Park, Jongho Han, Jeong-Chul Kim, John Lee, Changbum Jo, Ryong Ryoo
Summary: A PtZn alloy nanoparticle catalyst supported on mesoporous zeolite was synthesized and showed high activity, selectivity, and long catalytic lifetime in propane dehydrogenation. Scanning transmission electron microscopic analysis revealed finely dispersed Pt1Zn1 intermetallic compound-type alloy nanoparticles in the mesoporous zeolite, which effectively suppressed catalyst deactivation. The mesoporous structure and surface silanol groups of the MFI zeolite were suggested to play a crucial role in promoting the formation of intermetallic alloy nanoparticles.
Article
Electrochemistry
Raj Kumar Bera, Hongjun Park, Ryong Ryoo
Summary: This study reports the formation of Co nanoparticles and thin NC supported on 3DHPGC, showing excellent ORR/OER electrocatalytic activity and high durability. The Co-NC/3DHPGC enhances the dispersion of Co nanoparticles through a hierarchical porous structure, while demonstrating high energy density and efficiency in ZnAB.
Article
Chemistry, Physical
Woosuk Choi, Raj Kumar Bera, Seung Won Han, Hongjun Park, Tae Won Go, Minkee Choi, Ryong Ryoo, Jeong Young Park
Summary: The effect of nitrogen and sulfur doping on zeolite-templated carbon was investigated. It was found that nitrogen-doped zeolite-templated carbon had different composition ratios and electrical conductances depending on the synthesis temperature. The doped materials showed low ohmic drop and high capacitance when used as supercapacitor electrode materials. The doping effect was explained by measuring the work function.
Article
Nanoscience & Nanotechnology
Su-Kyung Lee, Hongjun Park, Kanghee Cho, Jong Min Park, Ryong Ryoo, U-Hwang Lee, Jong-San Chang
Summary: Nanoporous three-dimensional graphene-like carbons can be synthesized using metal ion-catalyzed synthesis method in different types of zeolite templates. The carbon products obtained have large specific surface areas and zeolite-like pore-structure ordering. Different types of zeolite-templated nanoporous carbons have distinct pore sizes and gas adsorption performance.
ACS APPLIED NANO MATERIALS
(2022)
Article
Multidisciplinary Sciences
Wonbeom Lee, Hyunjun Kim, Inho Kang, Hongjun Park, Jiyoung Jung, Haeseung Lee, Hyunchang Park, Ji Su Park, Jong Min Yuk, Seunghwa Ryu, Jae-Woong Jeong, Jiheong Kang
Summary: An elastic printed circuit board (E-PCB) is a conductive framework used for the assembly of stretchable electronics. This study presents a method using a liquid metal particle network (LMPNet) as an elastic conductor, which satisfies all the requirements for E-PCBs. The LMPNet enables the fabrication of high-density E-PCBs, allowing the integration of numerous electronic components to create highly stretchable skin electronics.
Article
Chemistry, Physical
Hongjun Park, Arumugam Manthiram
Summary: Micrometer-sized particles of single-crystalline octahedral-shaped Mn2O3 doped with various elements (Al, Ti, Ni, and Zr) were successfully synthesized using an ethanothermal method at 150 degrees C. The doping of other element(s) into the Mn2O3 framework was characterized by energy-dispersive X-ray spectroscopy and X-ray powder diffraction. The particle morphology changed dramatically to spheres when Ni was used as a dopant. The doped Mn2O3 with octahedral morphologies was employed as a precursor for the preparation of doped spinel LiMn2O4 cathodes for lithium-ion batteries, showing enhanced cycle life with the Al and Ti codoped sample exhibiting similar to 90% capacity retention after 100 cycles at C/3 rate in full cells with a graphite anode.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Applied
Jeong-Chul Kim, John Lee, Seung Won Han, Hongjun Park, Hanyoung Park, Jeong Young Park, Ryong Ryoo
Summary: Investigated the transformation of PtY/MZ catalyst from powder form to industrial pellets. Addition of 20 wt% of pseudo-boehmite as a binder resulted in the highest mechanical strength and catalytic activity. Demonstrated the use of other non-acidic binders.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hongjun Park, Zezhou Guo, Arumugam Manthiram
Summary: This study investigates the effect of oxidative synthesis conditions on the performance of LiMn2O4 spinel cathode materials and demonstrates that the use of oxygen flow during synthesis can minimize the generation of oxygen vacancies and improve the stoichiometric doping of the cathode, resulting in enhanced capacity fade resistance.
Article
Chemistry, Physical
Hanyoung Park, Jisuk Bang, Hongjun Park, Jaeheon Kim, Jeong-Chul Kim, Jeong Young Park, Ryong Ryoo
Summary: Silanol groups were generated in siliceous MFI zeolite nanosheets for catalytic application in gas-phase Beckmann rearrangement. The catalytic conversion was studied at 310 or 350 degrees C with different oxime reactants. The presence of silanol nests was found to be necessary for the conversion of certain oximes, while isolated silanols on the external surface were sufficient for others.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Hongjun Park, Raj Kumar Bera, Ryong Ryoo
Summary: By loading iodine (I-2) in the nanopores of 3D graphene-like carbon (3DGC), the resulting I-2/3DGC electrode shows excellent performance in Zn-based battery and BSH applications. The high reversibility of I-2 and supercapacitance of 3DGC contribute to the ultrahigh energy and power densities, while the confinement of I-2 in the micropores ensures high cyclic stability in both battery and supercapacitor modes.
ADVANCED ENERGY AND SUSTAINABILITY RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Hongjun Park, Jae Hwan An, Jisuk Bang, Doo-Sik Ahn, Seung Hyeon Ko, Osamu Terasaki, Wongu Youn, Insung S. Choi, Ryong Ryoo
Summary: Coronene and its derivatives were synthesized from methanol inside Ca2+ ion-exchanged small-pore zeolites with an 8-membered ring window, displaying white fluorescence under UV light. The presence of Ca2+ ions effectively attracted the pi-electron clouds of benzene rings, leading to rapid growth of the aromatic ring system. This phenomenon was observed in LTA and RHO zeolites, with further restrictions in molecular growth observed in CHA zeolite with smaller pore sizes.
MATERIALS CHEMISTRY FRONTIERS
(2021)
