Linear, Non-Conjugated Cyclic and Conjugated Cyclic Paraphenylene under Pressure



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Peña-Álvarez, Miriam and Fanetti, Samuele and Falsini, Naomi and Novelli, Giulia and Casado, Juan and García Baonza, Valentín and Taravillo Corralo, Mercedes and Parsons, Simon and Bini, Roberto and Citroni, Margherita (2019) Linear, Non-Conjugated Cyclic and Conjugated Cyclic Paraphenylene under Pressure. Molecules, 24 (19). p. 3496. ISSN 1420-3049

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The n-paraphenylene family comprises chains of phenylene units linked together by C-C bonds that are between single- and double-bonded, and where n corresponds to the number of phenylene units. In this work, we compare the response of the optical properties of different phenylene arrangements. We study linear chains (LPP), cyclic systems (CPPs), and non-conjugated cyclic systems with two hydrogenated phenylenes (H4[n]CPP). Particularly, the systems of interest in this work are [6]LPP, [12]- and [6]CPP and H4[6]CPP. This work combines Raman and infrared spectroscopies with absorption and fluorescence (one- and two-photon excitations) measured as a function of pressure up to maximum of about 25 GPa. Unprecedented crystallographic pressure-dependent results are shown on H4[n]CPP, revealing intramolecular π-π interactions upon compression. These intramolecular interactions justify the H4[n]CPP singular optical properties with increasing fluorescence lifetime as a function of pressure.

Item Type:Article
Uncontrolled Keywords:linear and cyclic paraphenylene; pressure; vibrational spectroscopy; absorption; fluorescence
Subjects:Sciences > Physics > Chemistry, Physical and theoretical
Sciences > Chemistry > Chemistry, Physical and theoretical
ID Code:66545
Deposited On:02 Jul 2021 14:03
Last Modified:06 Jul 2021 10:26

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