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739 results on '"You, Jingsong"'

36. Molecular Engineering of Chalcogen‐Embedded Anthanthrenes via peri‐Selective C−H Activation: Fine‐Tuning of Crystal Packing for Organic Field‐Effect Transistors.

Author

Liu, Zheng, Han, Weiguo, Lan, Jingbo, Sun, Lingyan, Tang, Junbin, Zhang, Cheng, and You, Jingsong

Subjects
ORGANIC field-effect transistors, OXIDATIVE coupling, FIELD-effect devices, HOLE mobility, ELECTRON mobility, ELECTRON transport, CHALCOGENS
Abstract

Disclosed herein is a RhCl3‐catalyzed peri‐selective C−H/C−H oxidative homo‐coupling of 1‐substituted naphthalenes, which provides a highly efficient and streamlined approach to chalcogen‐embedded anthanthrenes from readily available starting materials. Introducing O, S, and Se into the anthanthrene skeleton leads to gradually increased π–π stacking distances but significantly enhanced π–π overlaps with the growth of the hetero‐atom radius. Moderate π–π distance, overlap area, and intermolecular S−S interactions endow S‐embedded anthanthrene (PTT) with excellent 2D charge‐transport properties. Moreover, the transformation of p‐type to n‐type S‐embedded anthanthrenes is realized for the first time via the S‐atom oxidation from PTT to PTT‐O4. In organic field‐effect transistor devices, PTT derivatives exhibit hole transport with mobilities up to 1.1 cm2 V−1 s−1, while PTT‐O4 shows electron transport with a mobility of 0.022 cm2 V−1 s−1. [ABSTRACT FROM AUTHOR]

Published
2023
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46. Geometry engineering of a multiple resonance core viaa phenyl-embedded strategy toward highly efficient narrowband blue OLEDsElectronic supplementary information (ESI) available. CCDC 2249111(pe-QAO), 2249112(hp-BQAO), 2249621(6), 2248788(QAO), 2248789([5]he-BQAO), 2248790([6]he-BQAO). For ESI and crystallographic data in CIF or other electronic format see DOI: https://doi.org/10.1039/d3mh00617d

Author

Wu, Yimin, Liu, Xiaoyu, Liu, Junjie, Yang, Ge, Han, Songyan, Yang, Dezhi, Cao, Xiaosong, Ma, Dongge, Bin, Zhengyang, and You, Jingsong

Abstract

The geometry of the molecular skeleton is of importance for the property regulation of organic electronic materials. Herein, we present a phenyl-embedded molecular design strategy to adjust the molecular curvature and achieve the improvement of blue multiple resonance (MR)-emitters. The introduction of a bridged phenyl contributes to a highly twisted saddle skeleton and the separation of frontier molecular orbitals, which are beneficial for the increase of photoluminescence quantum yield (PLQY) as well as the decrease of singlet-triplet energy gap (ΔEST). Consequently, hp-BQAOfeatures an accelerated reverse intersystem crossing rate and suppressed non-radiative decay rate simultaneously, which enables the assembly of high-performance narrowband blue OLEDs with a record-high external quantum efficiency (EQE) of 24.1% for the blue OLED devices exploiting nitrogen-carbonyl-containing MR-emitters without sensitizers.

Published
2023
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47. An unusual [4 + 2] fusion strategy to forge meso-N/O-heteroarene-fused (quinoidal) porphyrins with intense near-infrared Q-bands† †Electronic supplementary information (ESI) available: Detailed information on experimental procedures, characterization data, computational calculations, crystallographic and spectroscopic data, and X-ray crystal structures (CIF). CCDC 1857684 (Zn1a), 1852362 (3aa), 1852363 (4ah), 1865973 (syn-5aa), 1852372 (syn-5af), 1857685 (syn-5ah) and 1852366 (anti-5ah). For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c9sc01596e

Author

Li, Chengming, Zhu, Lei, Liang, Wenbo, Su, Rongchuan, Yin, Jiangliang, Hu, Yanmei, Lan, Yu, Wu, Di, and You, Jingsong

Subjects
Chemistry
Abstract

Divergent synthesis of meso-N/O-heteroarene-fused (quinoidal) porphyrins was established via rhodium-catalyzed β-C–H activation/annulation of quinoidal porphyrins with alkynes., Here we present a divergent synthesis of brand-new types of meso-N/O-heteroarene-fused (quinoidal) porphyrins through Rh-catalyzed β-C–H activation/annulation of 5,15-dioxoporphyrins and dioxime derivatives with alkynes, in which the synthetic disconnections are difficult to access through the commonly used intramolecular cyclization strategy. Using the O-methyl oxime as a traceless oxidizing directing group, the meso-N-embedded pyridine-fused anti-quinoidal porphyrin 3 and pyridinium-fused cation 4 are formed with controllable chemoselectivity and complete anti-selectivity. Replacing the exocyclic oxime with a carbonyl group delivers the pyran-fused porphyrin 5, achieving structural conversion from a quinoidal conformation to a stable porphyrin macrocycle. Further oxidation of the expanded dimer 5ea gives the oxonium 6, which exhibits intense near-infrared (NIR) Q-bands up to 1300 nm. Theoretical studies demonstrate that the incorporation of a heteroatom at the meso-position enables more effective π-extension, resulting in a 22π aromatic (vs. 18π aromatic) character of pyran-fused porphyrins (syn/anti-5aa). Compared with the commercially available methylene blue (MB), syn-5al exhibits a better ability (ΦΔ = 0.61) to sensitize singlet oxygen (1O2) when irradiated with a 680 nm laser beam, and has potential as a photodynamic therapy (PDT) photosensitizer in the body's therapeutic window (650–900 nm).

Published
2019

48. Structurally Nontraditional Benzo[c]cinnoline‐Based Electron‐Transporting Materials with 3D Molecular Interaction Architecture.

Author

Shi, Yang, Bin, Zhengyang, Liu, Jiahui, Han, Weiguo, Yang, Ge, Lei, Bowen, and You, Jingsong

Subjects
MOLECULAR interactions, GLASS transition temperature, LIGHT emitting diodes, QUANTUM efficiency, INTERMOLECULAR interactions, ELECTRON mobility
Abstract

The academically widely used electron‐transporting materials (ETMs) typically suffer from low glass transition temperatures (Tg) that could lead to poor device stability. Considering practical applications, we herein put forward a "3D molecular interaction architecture" strategy to design high‐performance ETMs. As a proof‐of‐concept, a type of structurally nontraditional ETMs with the benzo[c]cinnoline (BZC) skeleton have been proposed and synthesized by the C−H/C−H homo‐coupling of N‐acylaniline as the key step. 2,9‐diphenylbenzo[c]cinnoline (DPBZC) exhibits strong intermolecular interactions that feature a 3D architecture, which boosts Tg to exceedingly high 218 °C with a fast electron mobility (μe) of 6.4×10−4 cm2 V−1 s−1. DPBZC‐based fluorescent organic light‐emitting diodes show outstanding electroluminescent performances with an external quantum efficiency of 20.1 % and a power efficiency as high as 70.6 lm W−1, which are superior to those of the devices with the commonly used ETMs. [ABSTRACT FROM AUTHOR]

Published
2022
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