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Karoń K, Rode JE, Kaczorek D, Kawęcki R, Pluczyk-Małek S, Łapkowski M, Ostrowski S, Lyczko K, Dobrowolski JC. UV-vis and ECD spectroelectrochemistry of atropisomeric naphthalenediimide derivative. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 288:122089. [PMID: 36436264 DOI: 10.1016/j.saa.2022.122089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 10/21/2022] [Accepted: 11/05/2022] [Indexed: 06/16/2023]
Abstract
The UV-vis and ECD spectroelectrochemistry (SEC) of a chiral binaphthalenylamine derivative of the N-butyl naphthalenediimide (NDIB-NH2) enantiomers were applied to measure UV-vis and ECD spectra of NDIB-NH2 radicals and dianion formed in the reduction and oxidation processes observed in cyclic voltammetry (CV). The CV curves and EPR spectroelectrochemistry enabled us to establish conditions at which a radical-anion [NDIB-NH2]̇.-, a dianion [NDIB-NH2]2-, and a radical-cation [NDIB-NH2]̇.+ are formed. The DFT restricted open-shell CAM-B3LYP-D3/def2TZVP/PCM calculations demonstrated that in the radical-anion [NDIB-NH2]̇.-, spin is spread over the NDI system while in the radical-cation [NDIB-NH2]̇+ it is spread over the aminonaphthalene moiety. The UV-vis spectra of radical-anion and dianion show the most significant changes in the 400-800 nm range. In that range, the ECD spectra varied with the change of electrode potential more than the UV-vis did and enabled the identification of a new ECD band of [NDIB-NH2]̇.- at ca. 400 nm hidden in the background in the UV spectra at -1000 mV. A broad structured ECD pattern with a maximum at ca. 530 nm was observed for [NDIB-NH2]̇.- (-1000 mV), while a single smooth ECD band of [NDIB-NH2]2- was located at 520 nm (-1750 mV). For the first time, an isosbestic point (455 nm) was found in ECD spectroelectrochemical measurements for the radical-cation [NDIB-NH2]̇.+ in equilibrium with the NDIB-NH2 neutral form. The TD-DFT CAM-B3LYP-D3/6-31G** calculations combined with the hybrid (explicit combined with implicit) solvation model fairly well reproduced the UV-vis and ECD SEC of neutral and redox forms of NDIB-NH2 but the ECD spectrum of [NDIB-NH2]̇.+ above 390 nm.
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Affiliation(s)
- Krzysztof Karoń
- Faculty of Chemistry, Silesian University of Technology, 9 Strzody Street, 44-100 Gliwice, Poland; Centre for Organic and Nanohybrid Electronics, Silesian University of Technology, 22b Konarskiego Street, 44-100 Gliwice, Poland.
| | - Joanna E Rode
- Laboratory for Spectroscopy, Molecular Modeling and Structure Determination, Institute of Nuclear Chemistry and Technology, 16 Dorodna Street, 03-195 Warsaw, Poland.
| | - Dorota Kaczorek
- Faculty of Science, Siedlce University, 3 Maja Street No 54, 08-110 Siedlce, Poland
| | - Robert Kawęcki
- Faculty of Science, Siedlce University, 3 Maja Street No 54, 08-110 Siedlce, Poland
| | - Sandra Pluczyk-Małek
- Faculty of Chemistry, Silesian University of Technology, 9 Strzody Street, 44-100 Gliwice, Poland; Centre for Organic and Nanohybrid Electronics, Silesian University of Technology, 22b Konarskiego Street, 44-100 Gliwice, Poland
| | - Mieczysław Łapkowski
- Faculty of Chemistry, Silesian University of Technology, 9 Strzody Street, 44-100 Gliwice, Poland; Centre for Organic and Nanohybrid Electronics, Silesian University of Technology, 22b Konarskiego Street, 44-100 Gliwice, Poland; Centre of Polymer and Carbon Materials, Polish Academy of Science, 34 Curie Sklodowska Street, 41-800 Zabrze, Poland
| | - Sławomir Ostrowski
- Laboratory for Spectroscopy, Molecular Modeling and Structure Determination, Institute of Nuclear Chemistry and Technology, 16 Dorodna Street, 03-195 Warsaw, Poland
| | - Krzysztof Lyczko
- Laboratory for Spectroscopy, Molecular Modeling and Structure Determination, Institute of Nuclear Chemistry and Technology, 16 Dorodna Street, 03-195 Warsaw, Poland
| | - Jan Cz Dobrowolski
- Laboratory for Spectroscopy, Molecular Modeling and Structure Determination, Institute of Nuclear Chemistry and Technology, 16 Dorodna Street, 03-195 Warsaw, Poland.
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