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Linear, non-conjugated cyclic and conjugated cyclic paraphenylene under pressure

DOI: 10.3390/molecules24193496 DOI Help

Authors: Miriam Peña-Álvarez (University of Edinburgh) , Samuele Fanetti (LENS–European Laboratory for Non-Linear Spectroscopy) , Naomi Falsini (LENS–European Laboratory for Non-Linear Spectroscopy) , Giulia Novelli (University of Edinburgh) , Juan Casado (University of Málaga) , Valentín G. Baonza (University Complutense of Madrid; Instituto de Geociencias IGEO (CSIC-UCM)) , Mercedes Taravillo (University Complutense of Madrid) , Simon Parsons (University of Edinburgh) , Roberto Bini (LENS–European Laboratory for Non-Linear Spectroscopy) , Margherita Citroni (LENS–European Laboratory for Non-Linear Spectroscopy)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Molecules , VOL 24

State: Published (Approved)
Published: October 2019
Diamond Proposal Number(s): 16139

Open Access Open Access

Abstract: 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.

Journal Keywords: linear and cyclic paraphenylene; pressure; vibrational spectroscopy; absorption; fluorescence

Subject Areas: Chemistry

Instruments: I19-Small Molecule Single Crystal Diffraction

Added On: 24/10/2019 10:49


Discipline Tags:

Organic Chemistry Chemistry

Technical Tags:

Diffraction Single Crystal X-ray Diffraction (SXRD)