1
|
Biffoli F, Bonechi M, Pagliai M, Innocenti M, Giovanardi R, Fontanesi C. Introducing the new concept of a chiral-polaron giant-IRAV signature, optical-active giant-response in vibrational circular dichroism. Phys Chem Chem Phys 2024. [PMID: 39314050 DOI: 10.1039/d4cp02876g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/25/2024]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) are a class of compounds of primary importance in the field of organic semiconductors, with applications in both organic electronics and photovoltaics. This paper delves into two strictly related topics. First, the theoretical rationalization of the physical factors underlying the emergence of the polaron "giant-response infrared active vibrations (IRAVs)" signature in positively charged PAHs. Results are presented concerning the tight comparison between the experimental results and theoretical results obtained within different DFT paradigms (BLYP, B3LYP, CAM-B3LYP and LC-BLYP) and the pure Hartree-Fock Hamiltonian. This allowed the rationalization of the emergence of the giant IRAV response as essentially propelled by long-range electronic interactions. Moreover, the role of vibrational modes and molecular dimensions (topology) is addressed. Second, the analysis is extended to chiral [4]helicene. This allows the introduction of a new concept yet to be explored experimentally: the chiral-polaron giant-IRAV signature in vibrational circular dichroism (VCD) spectra.
Collapse
Affiliation(s)
- Fabio Biffoli
- Department of Chemistry, "Ugo Schiff", University of Firenze, via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
- Materia Firenze Lab s.r.l., Gruppo Materia Firenze, Via delle Fonti 8/E, 50018 Scandicci (FI), Italy
| | - Marco Bonechi
- Department of Chemistry, "Ugo Schiff", University of Firenze, via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
- National Interuniversity Consortium of Materials Science and Technology (INSTM), Via G. Giusti 9, 50121 Firenze (FI), Italy
| | - Marco Pagliai
- Department of Chemistry, "Ugo Schiff", University of Firenze, via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | - Massimo Innocenti
- Department of Chemistry, "Ugo Schiff", University of Firenze, via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
- National Interuniversity Consortium of Materials Science and Technology (INSTM), Via G. Giusti 9, 50121 Firenze (FI), Italy
- National Research Council-Organometallic Compounds Chemistry Institute (CNR-ICCOM), Via Madonna del Piano 10, 50019 Sesto Fiorentino (FI), Italy
- Center for Colloid and Surface Science (CSGI), Via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy
| | - Roberto Giovanardi
- Department of Engineering "Enzo Ferrari", (DIEF), University of Modena and Reggio Emilia, Via vivarelli 10, 41125 Modena, Italy.
| | - Claudio Fontanesi
- National Interuniversity Consortium of Materials Science and Technology (INSTM), Via G. Giusti 9, 50121 Firenze (FI), Italy
- Department of Engineering "Enzo Ferrari", (DIEF), University of Modena and Reggio Emilia, Via vivarelli 10, 41125 Modena, Italy.
| |
Collapse
|
2
|
Xie SJ, Han JS, Ma XD, Mei LM, Lin DL. Localized vibrational modes around bipolarons in polythiophene. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:11928-11931. [PMID: 9977935 DOI: 10.1103/physrevb.51.11928] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|