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Lupi M, Fabbri M, Mazzeo G, Longhi G, Abbate S, Viglianisi C, Menichetti S. Organocatalytic hydrogen bond donor/Lewis base (HBD/LB) synthesis and chiroptical properties of thiabridged [5]helicenes. Org Biomol Chem 2024. [PMID: 39040026 DOI: 10.1039/d4ob00979g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/24/2024]
Abstract
Thiabridged [5]helicenes are obtained from thioaryl-N-phthalimido benzo[a]phenothiazines using a hydrogen bond donor/Lewis base organocatalytic approach. Resolution of [5]helicenes using either (1S)-(-)-camphanic acid as a chiral auxiliary or CSP-HPLC is reported. Thiabridged [5]helicenes show an exceptional configurational stability with racemization energy barriers higher than 40 kcal mol-1. Electronic circular dichroism and TD-DFT calculations permit the assignment of the absolute configuration, demonstrating that the sign of optical rotation is not easily related to the M or P structure. Separated enantiomers show circularly polarized luminescence with high dissymmetry ratio.
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Affiliation(s)
- Michela Lupi
- Department of Chemistry "Ugo Schiff" (DICUS), University of Florence, Via della Lastruccia 13, Sesto Fiorentino (FI), 50019 Florence, Italy.
| | - Mosè Fabbri
- Department of Chemistry "Ugo Schiff" (DICUS), University of Florence, Via della Lastruccia 13, Sesto Fiorentino (FI), 50019 Florence, Italy.
| | - Giuseppe Mazzeo
- Department of Molecular and Translational Medicine (DMMT), University of Brescia, V. le Europa 11, Brescia (BS), 25121 Brescia, Italy
| | - Giovanna Longhi
- Department of Molecular and Translational Medicine (DMMT), University of Brescia, V. le Europa 11, Brescia (BS), 25121 Brescia, Italy
| | - Sergio Abbate
- Department of Molecular and Translational Medicine (DMMT), University of Brescia, V. le Europa 11, Brescia (BS), 25121 Brescia, Italy
| | - Caterina Viglianisi
- Department of Chemistry "Ugo Schiff" (DICUS), University of Florence, Via della Lastruccia 13, Sesto Fiorentino (FI), 50019 Florence, Italy.
| | - Stefano Menichetti
- Department of Chemistry "Ugo Schiff" (DICUS), University of Florence, Via della Lastruccia 13, Sesto Fiorentino (FI), 50019 Florence, Italy.
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2
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Kos M, Beránek T, Císařová I, Cuřínová P, Žádný J, Storch J, Církva V, Jakubec M. Resolution of 9,10-Diketo[7]helicene and Its Use in One-Step Preparation of Helicene-Based D-A-D Push-Pull Systems. J Org Chem 2024; 89:7495-7502. [PMID: 38804645 PMCID: PMC11165575 DOI: 10.1021/acs.joc.4c00135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 04/26/2024] [Accepted: 05/17/2024] [Indexed: 05/29/2024]
Abstract
Racemic 9,10-diketo[7]helicene was successfully separated into enantiomers using a reversible and stereoselective reaction with 2,2'-diamino-1,1'-binaphthalene with moderate yields but with remarkable purity (>99% de). The enantiomerically pure diketone was used as a convenient starting material for the preparation of helicene-based push-pull molecules, which incorporated aza-aryl acceptors and diarylaminophenylene donor groups in a single step. A series of six push-pull systems, along with three reference molecules without donors, were prepared and studied using UV/vis and fluorescence measurements, circular dichroism, and DFT calculations.
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Affiliation(s)
- Martin Kos
- Research
Group of Advanced Materials and Organic Synthesis, Institute of Chemical Process Fundamentals of the Czech Academy of
Sciences, v. v. i., Rozvojová 135, 165
00 Prague 6, Czech
Republic
| | - Tomáš Beránek
- Research
Group of Advanced Materials and Organic Synthesis, Institute of Chemical Process Fundamentals of the Czech Academy of
Sciences, v. v. i., Rozvojová 135, 165
00 Prague 6, Czech
Republic
| | - Ivana Císařová
- Department
of Inorganic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 128 40 Prague 2, Czech Republic
| | - Petra Cuřínová
- Research
Group of Advanced Materials and Organic Synthesis, Institute of Chemical Process Fundamentals of the Czech Academy of
Sciences, v. v. i., Rozvojová 135, 165
00 Prague 6, Czech
Republic
- Department
of Organic Chemistry, University of Chemistry
and Technology, Technická
5, 166 28 Prague
6, Czech Republic
| | - Jaroslav Žádný
- Research
Group of Advanced Materials and Organic Synthesis, Institute of Chemical Process Fundamentals of the Czech Academy of
Sciences, v. v. i., Rozvojová 135, 165
00 Prague 6, Czech
Republic
| | - Jan Storch
- Research
Group of Advanced Materials and Organic Synthesis, Institute of Chemical Process Fundamentals of the Czech Academy of
Sciences, v. v. i., Rozvojová 135, 165
00 Prague 6, Czech
Republic
| | - Vladimír Církva
- Research
Group of Advanced Materials and Organic Synthesis, Institute of Chemical Process Fundamentals of the Czech Academy of
Sciences, v. v. i., Rozvojová 135, 165
00 Prague 6, Czech
Republic
| | - Martin Jakubec
- Research
Group of Advanced Materials and Organic Synthesis, Institute of Chemical Process Fundamentals of the Czech Academy of
Sciences, v. v. i., Rozvojová 135, 165
00 Prague 6, Czech
Republic
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Ando H, Takamura H, Kadota I, Tanaka K. Strongly reducing helical phenothiazines as recyclable organophotoredox catalysts. Chem Commun (Camb) 2024; 60:4765-4768. [PMID: 38529587 DOI: 10.1039/d4cc00904e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/27/2024]
Abstract
Recyclable phenothiazine organophotoredox catalysts (PTHS 1-3, E1/2ox* = -2.34 to -2.40 V vs. SCE) have been developed. When the recycling performance was evaluated, PTHS-1 could be recovered at least four times without loss of its catalytic activity. These recyclable organophotoredox catalysts represent a promising tool for sustainable organic synthesis.
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Affiliation(s)
- Haru Ando
- Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-Naka, Kitaku, Okayama 700-8530, Japan.
| | - Hiroyoshi Takamura
- Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-Naka, Kitaku, Okayama 700-8530, Japan.
| | - Isao Kadota
- Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-Naka, Kitaku, Okayama 700-8530, Japan.
| | - Kenta Tanaka
- Research Institute for Interdisciplinary Science, Okayama University, 3-1-1 Tsushima-Naka, Kitaku, Okayama 700-8530, Japan.
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Giaconi N, Poggini L, Lupi M, Briganti M, Kumar A, Das TK, Sorrentino AL, Viglianisi C, Menichetti S, Naaman R, Sessoli R, Mannini M. Efficient Spin-Selective Electron Transport at Low Voltages of Thia-Bridged Triarylamine Hetero[4]helicenes Chemisorbed Monolayer. ACS NANO 2023; 17:15189-15198. [PMID: 37493644 PMCID: PMC10416567 DOI: 10.1021/acsnano.3c04878] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 07/20/2023] [Indexed: 07/27/2023]
Abstract
The Chirality Induced Spin Selectivity (CISS) effect describes the capability of chiral molecules to act as spin filters discriminating flowing electrons according to their spin state. Within molecular spintronics, efforts are focused on developing chiral-molecule-based technologies to control the injection and coherence of spin-polarized currents. Herein, for this purpose, we study spin selectivity properties of a monolayer of a thioalkyl derivative of a thia-bridged triarylamine hetero[4]helicene chemisorbed on a gold surface. A stacked device assembled by embedding a monolayer of these molecules between ferromagnetic and diamagnetic electrodes exhibits asymmetric magnetoresistance with inversion of the signal according to the handedness of molecules, in line with the presence of the CISS effect. In addition, magnetically conductive atomic force microscopy reveals efficient electron spin filtering even at unusually low potentials. Our results demonstrate that thia[4]heterohelicenes represent key candidates for the development of chiral spintronic devices.
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Affiliation(s)
- Niccolò Giaconi
- Department
of Chemistry “Ugo Schiff” (DICUS) & INSTM Research
Unit, University of Florence, Via della Lastruccia 3-13, Sesto Fiorentino 50019, Italy
| | - Lorenzo Poggini
- Istituto
di Chimica dei Composti Organo-Metallici (ICCOM-CNR), Via Madonna del Piano 10, Sesto Fiorentino 50019, Italy
| | - Michela Lupi
- Department
of Chemistry “Ugo Schiff” (DICUS) & INSTM Research
Unit, University of Florence, Via della Lastruccia 3-13, Sesto Fiorentino 50019, Italy
| | - Matteo Briganti
- Department
of Chemistry “Ugo Schiff” (DICUS) & INSTM Research
Unit, University of Florence, Via della Lastruccia 3-13, Sesto Fiorentino 50019, Italy
| | - Anil Kumar
- Department
of Chemical and Biological Physics, Weizmann
Institute of Science, Rehovot 76100, Israel
| | - Tapan K. Das
- Department
of Chemical and Biological Physics, Weizmann
Institute of Science, Rehovot 76100, Israel
| | - Andrea L. Sorrentino
- Department
of Chemistry “Ugo Schiff” (DICUS) & INSTM Research
Unit, University of Florence, Via della Lastruccia 3-13, Sesto Fiorentino 50019, Italy
| | - Caterina Viglianisi
- Department
of Chemistry “Ugo Schiff” (DICUS) & INSTM Research
Unit, University of Florence, Via della Lastruccia 3-13, Sesto Fiorentino 50019, Italy
| | - Stefano Menichetti
- Department
of Chemistry “Ugo Schiff” (DICUS) & INSTM Research
Unit, University of Florence, Via della Lastruccia 3-13, Sesto Fiorentino 50019, Italy
| | - Ron Naaman
- Department
of Chemical and Biological Physics, Weizmann
Institute of Science, Rehovot 76100, Israel
| | - Roberta Sessoli
- Department
of Chemistry “Ugo Schiff” (DICUS) & INSTM Research
Unit, University of Florence, Via della Lastruccia 3-13, Sesto Fiorentino 50019, Italy
| | - Matteo Mannini
- Department
of Chemistry “Ugo Schiff” (DICUS) & INSTM Research
Unit, University of Florence, Via della Lastruccia 3-13, Sesto Fiorentino 50019, Italy
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5
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Cardona F, Parmeggiani C, Matassini C. Women in Bioorganic Chemistry. Molecules 2022; 27:molecules27134290. [PMID: 35807535 PMCID: PMC9268729 DOI: 10.3390/molecules27134290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 06/30/2022] [Indexed: 02/04/2023] Open
Abstract
We are very happy to present this Special Issue, for which we acted as guest editors, and which includes scientific contributions from laboratories headed by women active in the field of bioorganic chemistry [...]
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Affiliation(s)
- Francesca Cardona
- Dipartimento di Chimica “Ugo Schiff” (DICUS), Università di Firenze, via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy; (C.P.); (C.M.)
- Correspondence:
| | - Camilla Parmeggiani
- Dipartimento di Chimica “Ugo Schiff” (DICUS), Università di Firenze, via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy; (C.P.); (C.M.)
- European Laboratory for Non Linear Spectroscopy (LENS), via Nello Carrara 1, 50019 Sesto Fiorentino, Italy
| | - Camilla Matassini
- Dipartimento di Chimica “Ugo Schiff” (DICUS), Università di Firenze, via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy; (C.P.); (C.M.)
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