The Raman Fingerprint of Cyclic Conjugation: The case of the Stabilization of Cations and Dications in Cycloparaphenylenes

Miriam Pena Alvarez, M Carmen Ruiz Delgado, Mercedes Taravillo, Valentin G Baonza, Juan T Lopez Navarrete, Paul Evans, Ramesh Jasti, Shigeru Yamago, Miklos Kertesz, Juan Casado

Research output: Contribution to journalArticlepeer-review

Abstract

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.
Original languageEnglish
JournalChemical Science
Early online date6 Apr 2016
DOIs
Publication statusPublished - 1 Jun 2016

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