Absorbance spectra of polycrystalline samples and twinned crystals of oligothiophenes |
| |
Authors: | L Raimondo M Campione M Moret P Spearman S Tavazzi |
| |
Institution: | a Dipartimento di Scienza dei Materiali and CNISM, Università degli Studi di Milano Bicocca, Via R. Cozzi 53, I-20125 Milano, Italy b School of Chemical and Pharmaceutical Sciences, Kingston University, Kingston upon Thames KT1 2EE, United Kingdom |
| |
Abstract: | We propose optical absorption technique at oblique incidence as one of the spectroscopic tools that allow experimentally recognizing the macroscopic order and structural features of molecular solids of conjugated molecules, from single crystals to polycrystalline or twinned samples. We apply this spectroscopy to quaterthiophene as representative of a wide class of materials that usually possess optical transitions of Frenkel exciton origin with strong directional dispersion. The comparison between experimental and simulated data gives evidence of the high sensitivity of this technique for determining quantitatively the polycrystallinity of the measured samples, whose domains may show mirror-like orientation of the unit cell with respect to one of its faces.Frenkel exciton; Oligothiophene, Optical properties |
| |
Keywords: | Frenkel exciton Oligothiophene Optical properties |
本文献已被 ScienceDirect 等数据库收录! |
|