Akimitsu Narita

article

Negatively Curved Octagon‐Incorporated Aza‐nanographene and its Assembly with Fullerenes

Jun Liu, Juan Hong, Zhenxing Liao, Jingyun Tan, more

Angewandte Chemie International Edition > 63 > 15 > n/a - n/a

A negatively curved aza‐nanographene (NG) containing two octagons was synthesized by a regioselective and stepwise cyclodehydrogenation procedure, in which a double aza[7]helicene was simultaneously formed as an intermediate. Their saddle‐shaped structures with negative curvature were unambiguously confirmed by X‐ray crystallography, thereby enabling the exploration of the structure–property relationship...

article

Negatively Curved Octagon‐Incorporated Aza‐nanographene and its Assembly with Fullerenes

Jun Liu, Juan Hong, Zhenxing Liao, Jingyun Tan, more

Angewandte Chemie > 136 > 15 > n/a - n/a

A negatively curved aza‐nanographene (NG) containing two octagons was synthesized by a regioselective and stepwise cyclodehydrogenation procedure, in which a double aza[7]helicene was simultaneously formed as an intermediate. Their saddle‐shaped structures with negative curvature were unambiguously confirmed by X‐ray crystallography, thereby enabling the exploration of the structure–property relationship...

article

Chiral Nanographene‐Based Near‐Infrared Fluorophore with Self‐Blinking Properties

Xiushang Xu, Qiqi Yang, Hao Zhao, Serhii Vasylevskyi, more

Advanced Functional Materials > 34 > 11 > n/a - n/a

Near‐infrared (NIR) fluorophores are highly desirable for super‐resolution fluorescence microscopy; however, their optical properties are typically relatively poor, with low photo‐intensity (mean photon number below 1000), and unfavorably high on‐off blinking duty cycle. In this work, the synthesis and characterization of tetrabenzodinaphthopyranthren (TBDNP) derivative as a novel nanographene that...

article

On‐Surface Interchain Coupling and Skeletal Rearrangement of Indenofluorene Polymers

Qiang Chen, Marco Di Giovannantonio, Kristjan Eimre, José I. Urgel, more

Macromolecular Chemistry and Physics > 224 > 24 > n/a - n/a

On‐surface synthesis serves as a powerful approach to construct π‐conjugated carbon nanostructures that are not accessible by conventional wet chemistry. Nevertheless, this method has been limited by the types and numbers of available on‐surface transformations. While the majority of successful cases exploit thermally triggered dehalogenative carbon–carbon coupling and cyclodehydrogenation, rearrangement...

article

On‐Surface Synthesis of Edge‐Extended Zigzag Graphene Nanoribbons

Amogh Kinikar, Xiushang Xu, Marco Di Giovannantonio, Oliver Gröning, more

Advanced Materials > 35 > 48 > n/a - n/a

Graphene nanoribbons (GNRs) have gained significant attention in nanoelectronics due to their potential for precise tuning of electronic properties through variations in edge structure and ribbon width. However, the synthesis of GNRs with highly sought‐after zigzag edges (ZGNRs), critical for spintronics and quantum information technologies, remains challenging. In this study, a design motif for synthesizing...

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N=8 Armchair Graphene Nanoribbons: Solution Synthesis and High Charge Carrier Mobility**

Xuelin Yao, Heng Zhang, Fanmiao Kong, Antoine Hinaut, more

Angewandte Chemie International Edition > 62 > 46 > n/a - n/a

Structurally defined graphene nanoribbons (GNRs) have emerged as promising candidates for nanoelectronic devices. Low band gap (<1 eV) GNRs are particularly important when considering the Schottky barrier in device performance. Here, we demonstrate the first solution synthesis of 8‐AGNRs through a carefully designed arylated polynaphthalene precursor. The efficiency of the oxidative cyclodehydrogenation...

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N=8 Armchair Graphene Nanoribbons: Solution Synthesis and High Charge Carrier Mobility**

Xuelin Yao, Heng Zhang, Fanmiao Kong, Antoine Hinaut, more

Angewandte Chemie > 135 > 46 > n/a - n/a

Structurally defined graphene nanoribbons (GNRs) have emerged as promising candidates for nanoelectronic devices. Low band gap (<1 eV) GNRs are particularly important when considering the Schottky barrier in device performance. Here, we demonstrate the first solution synthesis of 8‐AGNRs through a carefully designed arylated polynaphthalene precursor. The efficiency of the oxidative cyclodehydrogenation...

article

Nanographene‐Based Decoration as a Panchromatic Antenna for Metalloporphyrin Conjugates (Small 42/2023)

Saül Garcia‐Orrit, Victor Vega‐Mayoral, Qiang Chen, Gianluca Serra, more

Small > 19 > 42 > n/a - n/a

Metalloporphyrin Conjugates In article number 2301596, Matteo Tommasini, Juan Cabanillas‐González, and co‐workers reveal the photophysics of a fused nanographene–metalloporphyrin. The diagram shows the unveiled relaxation pathways of excited states. Photoexcitation populates ligand‐centered singlets, transitioning via intersystem crossing to metal‐centered triplets, then relaxing to ligand‐centered...

article

Nanographene‐Based Decoration as a Panchromatic Antenna for Metalloporphyrin Conjugates

Saül Garcia‐Orrit, Victor Vega‐Mayoral, Qiang Chen, Gianluca Serra, more

Small > 19 > 42 > n/a - n/a

Porphyrins, a type of heterocyclic aromatic compounds consisting of tetrapyrroles connected by four substituted methine groups, are appealing building blocks for solar energy applications. However, their photosensitization capability is limited by their large optical energy gap, which results in a mismatch in absorption toward efficient harvesting of the solar spectrum. Porphyrin π‐extension by edge‐fusing...

article

Back Cover: Magnetism in Nonplanar Zigzag Edge Termini of Graphene Nanoribbons (Angew. Chem. Int. Ed. 24/2023)

Xiushang Xu, Kewei Sun, Atsushi Ishikawa, Akimitsu Narita, more

Angewandte Chemie International Edition > 62 > 24 > n/a - n/a

Graphene nanoribbons with unique edge and termini structures were synthesized on an Au(111) surface using 7‐bromo‐12‐(10‐bromoanthracen‐9‐yl)tetraphene as the molecular precursor. The nonplanar zigzag termini demonstrated Kondo resonance even on bare Au(111), as reported by Atsushi Ishikawa, Akimitsu Narita, Shigeki Kawai and co‐workers in their Research Article (e202302534).

article

Magnetism in Nonplanar Zigzag Edge Termini of Graphene Nanoribbons

Xiushang Xu, Kewei Sun, Atsushi Ishikawa, Akimitsu Narita, more

Angewandte Chemie International Edition > 62 > 24 > n/a - n/a

Graphene nanoribbons (GNRs) and nanographenes synthesized by on‐surface reactions using tailor‐made molecular precursors offer an ideal playground for a study of magnetism towards nano‐spintronics. Although the zigzag edge of GNRs has been known to host magnetism, the underlying metal substrates usually veil the edge‐induced Kondo effect. Here, we report the on‐surface synthesis of unprecedented,...

article

Rücktitelbild: Magnetism in Nonplanar Zigzag Edge Termini of Graphene Nanoribbons (Angew. Chem. 24/2023)

Xiushang Xu, Kewei Sun, Atsushi Ishikawa, Akimitsu Narita, more

Angewandte Chemie > 135 > 24 > n/a - n/a

Graphene nanoribbons with unique edge and termini structures were synthesized on an Au(111) surface using 7‐bromo‐12‐(10‐bromoanthracen‐9‐yl)tetraphene as the molecular precursor. The nonplanar zigzag termini demonstrated Kondo resonance even on bare Au(111), as reported by Atsushi Ishikawa, Akimitsu Narita, Shigeki Kawai and co‐workers in their Research Article (e202302534).

article

Magnetism in Nonplanar Zigzag Edge Termini of Graphene Nanoribbons

Xiushang Xu, Kewei Sun, Atsushi Ishikawa, Akimitsu Narita, more

Angewandte Chemie > 135 > 24 > n/a - n/a

Graphene nanoribbons (GNRs) and nanographenes synthesized by on‐surface reactions using tailor‐made molecular precursors offer an ideal playground for a study of magnetism towards nano‐spintronics. Although the zigzag edge of GNRs has been known to host magnetism, the underlying metal substrates usually veil the edge‐induced Kondo effect. Here, we report the on‐surface synthesis of unprecedented,...

article

Graphene‐Like Conjugated Molecule as Hole‐Selective Contact for Operationally Stable Inverted Perovskite Solar Cells and Modules

Tianhao Wu, Xiushang Xu, Luis K. Ono, Ting Guo, more

Advanced Materials > 35 > 21 > n/a - n/a

Further enhancing the operational lifetime of inverted‐structure perovskite solar cells (PSCs) is crucial for their commercialization, and the design of hole‐selective contacts at the illumination side plays a key role in operational stability. In this work, the self‐anchoring benzo[rst]pentaphene (SA‐BPP) is developed as a new type of hole‐selective contact toward long‐term operationally stable inverted...

article

Zigzag‐Edged Polycyclic Aromatic Hydrocarbons from Benzo[m]tetraphene Precursors

Bo Yang, Yanwei Gu, Giuseppe M. Paternò, Joan Teyssandier, more

Chemistry – A European Journal > 29 > 22 > n/a - n/a

A series of zigzag‐edged polycyclic aromatic hydrocarbons (PAHs) (Z1‐Z3) were synthesized from 2,12‐dibromo‐7,14‐diphenyl‐benzo[m]tetraphene (9) as a versatile building block. Their structures were unambiguously confirmed by laser desorption/ionization time‐of‐flight mass spectrometry, ¹H NMR, Raman, and Fourier‐transformed infrared (FTIR) spectroscopies as well as scanning tunneling microscopy. The...

article

Synthesis of a π‐Extended Double [9]Helicene

Jingyun Tan, Xiushang Xu, Jun Liu, Serhii Vasylevskyi, more

Angewandte Chemie International Edition > 62 > 18 > n/a - n/a

Double helicenes are appealing chiral frameworks. Their π‐extension is desirable to achieve (chir)optical response in the visible and near‐infrared (NIR) region, but access to higher double [n]helicenes (n≥8) has remained challenging. Herein, we report an unprecedented π‐extended double [9]helicene (D9H), unambiguously revealing its structure by single‐crystal X‐ray diffraction. D9H shows remarkable...

article

Synthesis of a π‐Extended Double [9]Helicene

Jingyun Tan, Xiushang Xu, Jun Liu, Serhii Vasylevskyi, more

Angewandte Chemie > 135 > 18 > n/a - n/a

Double helicenes are appealing chiral frameworks. Their π‐extension is desirable to achieve (chir)optical response in the visible and near‐infrared (NIR) region, but access to higher double [n]helicenes (n≥8) has remained challenging. Herein, we report an unprecedented π‐extended double [9]helicene (D9H), unambiguously revealing its structure by single‐crystal X‐ray diffraction. D9H shows remarkable...

article

Synthesis of Bioctacene‐Incorporated Nanographene with Near‐Infrared Chiroptical Properties

Xiushang Xu, Rafael Muñoz‐Mármol, Serhii Vasylevskyi, Andrea Villa, more

Angewandte Chemie > 135 > 14 > n/a - n/a

We report the synthesis of a hexabenzoperihexacene (HBPH) with two incorporated octacene substructures, which was unambiguously characterized by single‐crystal X‐ray analysis. The theoretical isomerization barrier of the (P,P)‐/(P,M)‐forms was estimated to be 38.4 kcal mol⁻¹, and resolution was achieved by chiral HPLC. Notably, the enantiomers exhibited opposite circular dichroism responses up to...

article

Synthesis of Bioctacene‐Incorporated Nanographene with Near‐Infrared Chiroptical Properties

Xiushang Xu, Rafael Muñoz‐Mármol, Serhii Vasylevskyi, Andrea Villa, more

Angewandte Chemie International Edition > 62 > 14 > n/a - n/a

We report the synthesis of a hexabenzoperihexacene (HBPH) with two incorporated octacene substructures, which was unambiguously characterized by single‐crystal X‐ray analysis. The theoretical isomerization barrier of the (P,P)‐/(P,M)‐forms was estimated to be 38.4 kcal mol⁻¹, and resolution was achieved by chiral HPLC. Notably, the enantiomers exhibited opposite circular dichroism responses up to...

article

A Deep‐Learning Framework for the Automated Recognition of Molecules in Scanning‐Probe‐Microscopy Images

Zhiwen Zhu, Jiayi Lu, Fengru Zheng, Cheng Chen, more

Angewandte Chemie > 134 > 49 > n/a - n/a

Computer vision as a subcategory of deep learning tackles complex vision tasks by dealing with data of images. Molecular images with exceptionally high resolution have been achieved thanks to the development of techniques like scanning probe microscopy (SPM). However, extracting useful information from SPM image data requires careful analysis which heavily relies on human supervision. In this work,...

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Search results for: Akimitsu Narita

Negatively Curved Octagon‐Incorporated Aza‐nanographene and its Assembly with Fullerenes

Negatively Curved Octagon‐Incorporated Aza‐nanographene and its Assembly with Fullerenes

Chiral Nanographene‐Based Near‐Infrared Fluorophore with Self‐Blinking Properties

On‐Surface Interchain Coupling and Skeletal Rearrangement of Indenofluorene Polymers

On‐Surface Synthesis of Edge‐Extended Zigzag Graphene Nanoribbons

N=8 Armchair Graphene Nanoribbons: Solution Synthesis and High Charge Carrier Mobility**

N=8 Armchair Graphene Nanoribbons: Solution Synthesis and High Charge Carrier Mobility**

Nanographene‐Based Decoration as a Panchromatic Antenna for Metalloporphyrin Conjugates (Small 42/2023)

Nanographene‐Based Decoration as a Panchromatic Antenna for Metalloporphyrin Conjugates

Back Cover: Magnetism in Nonplanar Zigzag Edge Termini of Graphene Nanoribbons (Angew. Chem. Int. Ed. 24/2023)

Magnetism in Nonplanar Zigzag Edge Termini of Graphene Nanoribbons

Rücktitelbild: Magnetism in Nonplanar Zigzag Edge Termini of Graphene Nanoribbons (Angew. Chem. 24/2023)

Magnetism in Nonplanar Zigzag Edge Termini of Graphene Nanoribbons

Graphene‐Like Conjugated Molecule as Hole‐Selective Contact for Operationally Stable Inverted Perovskite Solar Cells and Modules

Zigzag‐Edged Polycyclic Aromatic Hydrocarbons from Benzo[m]tetraphene Precursors

Synthesis of a π‐Extended Double [9]Helicene

Synthesis of a π‐Extended Double [9]Helicene

Synthesis of Bioctacene‐Incorporated Nanographene with Near‐Infrared Chiroptical Properties

Synthesis of Bioctacene‐Incorporated Nanographene with Near‐Infrared Chiroptical Properties

A Deep‐Learning Framework for the Automated Recognition of Molecules in Scanning‐Probe‐Microscopy Images

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