Temperature-dependent vibrational spectroscopy to study order-disorder transitions in charge transfer complexes

• Verfasst von: Isaac, Rohan [VerfasserIn]
• Verfasst von: Goetz, Katelyn [VerfasserIn]
• Verfasst von: Roberts, Drew [VerfasserIn]
• Titel: Temperature-dependent vibrational spectroscopy to study order-disorder transitions in charge transfer complexes
• Verf.angabe: Rohan Isaac, Katelyn P. Goetz, Drew Roberts, Oana D. Jurchescu, L.E. McNeil
• E-Jahr: 2018
• Jahr: 16 February 2018
• Umfang: 7 S.
• Fussnoten: Gesehen am 18.02.2020
• Titel Quelle: Enthalten in: AIP Advances
• Ort Quelle: New York, NY : American Inst. of Physics, 2011
• Jahr Quelle: 2018
• Band/Heft Quelle: 8(2018,2) Artikel-Nummer 025117, 7 Seiten
• ISSN Quelle: 2158-3226
• DOI: doi:10.1063/1.5018731
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1690247541

Abstract

Charge-transfer (CT) complexes are a promising class of materials for the semiconductor industry because of their versatile properties. This class of compounds shows a variety of phase transitions, which are of interest because of their potential impact on the electronic characteristics. Here temperature-dependent vibrational spectroscopy is used to study structural phase transitions in a set of organic CT complexes. Splitting and broadening of infrared-active phonons in the complex formed between pyrene and pyromellitic dianhydride (PMDA) confirm the structural transition is of the order-disorder type and complement previous x-ray diffraction (XRD) results. We show that this technique is a powerful tool to characterize transitions, and apply it to a range of binary CT complexes composed of polyaromatic hyrdocarbons (anthracene, perylene, phenanthrene, pyrene, and stilbene) and PMDA. We extend the understanding of transitions in perylene-PMDA and pyrene-PMDA, and show that there are no order-disorder transitions present in anthracene-PMDA, stilbene-PMDA and phenanthrene-PMDA in the temperature range investigated here.