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Bis-4,4'-biphenyl Ring Embedded Octaphyrin with Three Distinct Conformational Structures

机译:双-4,4'-biphenyl环嵌入八萘丁,具有三个不同的构象结构

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摘要

Three distinct conformational structures of carbaoctaphyrins were prepared by incorporating bis-4,4'-biphenyl units in the macrocyclic core. The free-base form adopts a figure-eight conformation, whereas the protonation triggers a conformational change with a pyrrole ring inversion and acquires an open-framework structure. The insertion of bis-Rh~I metal ion in the macrocyclic core affords a singly twisted conformational structure. Furthermore, the local aromaticity in the bis-4,4'-biphenyl ring dominates the overall macrocyclic aromaticity in all three forms, and thus adopts nonaromatic characteristics. These results are supported by spectral as well as theoretical studies, and they are unambiguously confirmed by X-ray crystal analyses.
机译:通过掺入大环核中的双-4,4'-联苯单元来制备三种不同构象结构。 自由碱形式采用图 - 八构象,而质子化触发了吡咯环反转的构象变化,并获取开放式框架结构。 在大环芯中插入BIS-RH〜I金属离子提供单扭曲的构象结构。 此外,双-4,4'-联烯基环中的局部芳香性在所有三种形式中占据了总体巨环芳香性,因此采用非芳族特性。 这些结果由光谱以及理论研究支持,并且通过X射线晶体分析明确地证实。

著录项

  • 来源
    《Chemistry: A European journal》 |2019年第56期|共5页
  • 作者单位

    National Institute of Science Education and Research (NISER) HBNI Bhubaneswar 752050 Odisha (India);

    National Institute of Science Education and Research (NISER) HBNI Bhubaneswar 752050 Odisha (India);

    National Institute of Science Education and Research (NISER) HBNI Bhubaneswar 752050 Odisha (India);

    Department of Chemistry and Spectroscopy Laboratory for Functional p-Electronic Systems Yonsei University Seoul 03722 (Korea);

    Department of Chemistry and Spectroscopy Laboratory for Functional p-Electronic Systems Yonsei University Seoul 03722 (Korea);

    National Institute of Science Education and Research (NISER) HBNI Bhubaneswar 752050 Odisha (India);

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 应用化学;
  • 关键词

    carbaporphyrinoids; coordination chemistry; expanded porphyrins; nonaromaticity; octaphyrin;

    机译:碳酸卟啉;协调化学;膨胀卟啉;非大气;octophyrin;

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