RT Journal Article T1 Linear, Non-Conjugated Cyclic and Conjugated Cyclic Paraphenylene under Pressure A1 Peña-Álvarez, Miriam A1 Fanetti, Samuele A1 Falsini, Naomi A1 Novelli, Giulia A1 Casado, Juan A1 García Baonza, Valentín A1 Taravillo Corralo, Mercedes A1 Parsons, Simon A1 Bini, Roberto A1 Citroni, Margherita AB 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. PB MDPI SN 1420-3049 YR 2019 FD 2019-09-26 LK https://hdl.handle.net/20.500.14352/12631 UL https://hdl.handle.net/20.500.14352/12631 LA eng NO European Laboratory for Non-Linear Spectroscopy DS Docta Complutense RD 25 jul 2024