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Open AccessArticle

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

1
School of Physics and Astronomy and Centre for Science at Extreme Conditions, University of Edinburgh, Edinburgh EH9 3FD, UK
2
LENS–European Laboratory for Non-Linear Spectroscopy, 50019 Sesto, Florence, Italy
3
Centre for Science at Extreme Conditions and EastChem School of Chemistry, University of Edinburgh, Edinburgh EH9 3FJ, UK
4
Department of Physical Chemistry, Faculty of Science, University of Málaga, CEI Andalucía Tech, Campus de Teatinos s/n, 29071 Málaga, Spain
5
MALTA-Consolider Team, Department of Physical Chemistry I, Chemistry Faculty, University Complutense of Madrid, 28040 Madrid, Spain
6
Instituto de Geociencias IGEO (CSIC-UCM), 28040 Madrid, Spain
*
Author to whom correspondence should be addressed.
Academic Editors: Ines Collings, Andrew B. Cairns and Miklos Kertesz
Molecules 2019, 24(19), 3496; https://doi.org/10.3390/molecules24193496
Received: 16 August 2019 / Revised: 8 September 2019 / Accepted: 17 September 2019 / Published: 26 September 2019
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. View Full-Text
Keywords: linear and cyclic paraphenylene; pressure; vibrational spectroscopy; absorption; fluorescence linear and cyclic paraphenylene; pressure; vibrational spectroscopy; absorption; fluorescence
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MDPI and ACS Style

Peña-Álvarez, M.; Fanetti, S.; Falsini, N.; Novelli, G.; Casado, J.; G. Baonza, V.; Taravillo, M.; Parsons, S.; Bini, R.; Citroni, M. Linear, Non-Conjugated Cyclic and Conjugated Cyclic Paraphenylene under Pressure. Molecules 2019, 24, 3496. https://doi.org/10.3390/molecules24193496

AMA Style

Peña-Álvarez M, Fanetti S, Falsini N, Novelli G, Casado J, G. Baonza V, Taravillo M, Parsons S, Bini R, Citroni M. Linear, Non-Conjugated Cyclic and Conjugated Cyclic Paraphenylene under Pressure. Molecules. 2019; 24(19):3496. https://doi.org/10.3390/molecules24193496

Chicago/Turabian Style

Peña-Álvarez, Miriam; Fanetti, Samuele; Falsini, Naomi; Novelli, Giulia; Casado, Juan; G. Baonza, Valentín; Taravillo, Mercedes; Parsons, Simon; Bini, Roberto; Citroni, Margherita. 2019. "Linear, Non-Conjugated Cyclic and Conjugated Cyclic Paraphenylene under Pressure" Molecules 24, no. 19: 3496. https://doi.org/10.3390/molecules24193496

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