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タイトル: | The Raman fingerprint of cyclic conjugation: the case of the stabilization of cations and dications in cycloparaphenylenes |
著者: | Alvarez, Miriam Peña Ruiz Delgado, M. Carmen Taravillo, Mercedes Baonza, Valentín G. López Navarrete, Juan T. Evans, Paul Jasti, Ramesh Yamago, Shigeru https://orcid.org/0000-0002-4112-7249 (unconfirmed) Kertesz, Miklos Casado, Juan |
著者名の別形: | 山子, 茂 |
発行日: | Jun-2016 |
出版者: | Royal Society of Chemistry (RSC) |
誌名: | Chemical Science |
巻: | 7 |
号: | 6 |
開始ページ: | 3494 |
終了ページ: | 3499 |
抄録: | Radical cations and dications of [n]CPP from n = 5 to n = 12 have been studied by Raman spectroscopy and density functional theory. Small [n]CPP dications owe their stability to the closed-shell electronic structure imposed by cyclic conjugation surpassing the destabilizing effect of ring strain and of the electron deficiency of the charged states. Large [n]CPP dications mitigate cyclic strain by forming diradicals. The Raman spectra reflect the balance among cyclic conjugation, cyclic strain and biradicaloid stabilization by finding an unexpected turning point in the frequency behavior of the G vibrational modes as a function of size. These Raman data represent the vibrational fingerprint of this rare form of conjugation which is central to stabilize both cations and dications of [n]CPP macrocycles. |
著作権等: | This journal is © The Royal Society of Chemistry 2016 This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. |
URI: | http://hdl.handle.net/2433/226369 |
DOI(出版社版): | 10.1039/c6sc00765a |
PubMed ID: | 29997841 |
出現コレクション: | 学術雑誌掲載論文等 |
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