JOURNAL OF ORGANIC CHEMISTRY
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2019
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IF 4.745
Shaofeng Wu,Jianyu Dong,Dan Zhou,Wan Wang,Long Liu,Yongbo Zhou
A H3PO3-catalyzed alkylation of phenols with alkenes is achieved in a facile, efficient, and selective manner. The reaction shows a unique selectivity, i.e., excellent regioselectivity, thorough suppression of overalkylation, without alkylation of a simple phenyl ring, and can selectively provide ortho-, meta-, or para-alkylated phenol derivatives in good to excellent yields. This feature along with mild reaction conditions, sensitive functional group tolerance, and scale-up synthesis and late modification of phenolic bioactive compounds make it an ideal and practical alternative for the modification of phenols.
研究领域:
有机化学
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药物化学
✓ 已验证
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
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2020
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IF 3.862
Chengdong Lv,Rulin Yang,Guangqiang Xu,Li Zhou,Qinggang Wang
An asymmetric kinetic resolution polymerization (AKRP) of 2-benzyl-ε-caprolactone (2-BnCL) and 6-benzyl-ε-caprolactone (6-BnCL) has been developed. Phosphoric acids catalyze the ring-opening polymerizations smoothly, delivering stereogradient polycaprolactones with controlled molecular weights and narrow molecular weight distributions. At 50% conversions, the selectivity factors of this AKRP process are in a range of 1.9–2.5, which indicates clear dynamic differentiations of two enantiomers. Regarding the AKRP of 6-BnCL, a high selectivity factor of 7.2 is obtained at the early stage, and an interesting chiral reduction phenomenon is observed as reaction proceeding. Kinetic studies illustrate the enantiomorphic site control plays dominate role in this AKRP process, and a mismatch of chiral induction and chain steric hindrance is proposed to be responsible for the chiral reduction issue.
研究领域:
高分子化学
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有机化学
✓ 已验证
DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
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2025
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IF 13.5
Shantao Zhang,TianAo Hou,Yandong Wang,Zhimin Fang,Yu Wu,Haolin Wang,Tao Chen,Shuang Chen,Wenhua Zhang,Shengzhong Liu,Shangfeng Yang
In the rapidly evolving field of photovoltaic technology, self-assembled monolayers (SAMs) have become essential hole-selective layers (HSLs) for inverted perovskite solar cells (PSCs). SAMs not only determine interfacial hole extraction but also significantly influence the film quality of the atop perovskite layers, consequently affecting the efficiency and stability of perovskite solar cells. Among various SAMs, carbazole-based SAMs, exemplified by 4PACZ, have emerged as prominent due to their electron-rich characteristics, making them some of the most prevalent HSLs in modern inverted PSCs. Nevertheless, 4PACZ exhibits significant limitations: one major issue is its limited molecular dipole, which leads to insufficient energy level alignment between the treated substrate and the perovskite, causing substantial interfacial energy loss. Another critical challenge is the flat structure of the carbazole unit, which often promotes molecular stacking, resulting in incomplete substrate coverage and non-uniform film formation, thereby compromising both device performance and stability. In this study, we designed a novel SAM based on a polycyclic aromatic hydrocarbon derivative, (4-(8H-dinaphtho[2,3-c:2',3'-g]carbazol-8-yl)butyl)phosphonic acid (4PADNC), with the aim of optimizing hole transport in inverted PSCs. This SAM incorporates the structurally extended dinaphtho[2,3-c:2',3'-g]carbazole (DNC) as the functional terminal group, replacing the single carbazole unit in the traditional material 4PACZ. The key structural difference is that the DNC group provides a significantly expanded π-conjugated skeleton and enhanced electron-rich characteristics. These features not only greatly enhance hole extraction and transport at the interface but also induce a significant increase in the molecular dipole moment, which is crucial for effectively adjusting the work function of ITO, ensuring proper alignment with the perovskite layer. Additionally, there is an intramolecular dihedral angle of approximately 34.62° in the DNC unit at the core of 4PADNC. This non-planar configuration contrasts sharply with the planar carbazole structure. The larger dihedral angle effectively suppresses excessive π-π stacking between molecules, which not only aids in forming a denser and more ordered molecular layer on the ITO surface but also provides a more favorable and defect-free substrate for the growth of the upper perovskite. With these upgrades, the inverted PSCs based on 4PADNC achieved a PCE as high as 24.32%, compared to 22.89% for the control devices based on 4PACZ. Furthermore, the 4PADNC-based devices also exhibited superior thermal stability and operational stability.
研究领域:
材料科学
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光伏技术
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表面化学
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纳米结构材料
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能源材料
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分子工程
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器件物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）