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El Haitami A, Resmerita AM, Fichet O, Cantin S, Aubert PH, Farcas A. Synthesis, Photophysics, and Langmuir Films of Polyfluorene/Permodified Cyclodextrin Polyrotaxanes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:11406-11413. [PMID: 34528811 DOI: 10.1021/acs.langmuir.1c02014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In the present study, we investigated the effect of permodified 2,3,6-tri-O-trimethylsilyl β- and γ-cyclodextrin (TMS·β-CD, TMS·γ-CD) encapsulation on the optical, electrochemical, morphological, and supramolecular arrangements of a poly[2,7'-(9,9-dioctylfluorene-alt-2',7-fluorene)] PF copolymer. For this purpose, the photophysical properties and Langmuir monolayer formation of PF·TMS·β-CD and PF·TMS·γ-CD polyrotaxanes were investigated and compared with those of the reference PF. Surface pressure-area isotherms and Brewster angle microscopy studies indicated the capability of both polyrotaxanes to organize into larger and homogeneous 2D supramolecular assemblies at the air-water interface. The obtained results suggest that the presence of the surrounding TMS·β-CD and TMS·γ-CD macrocycles on the PF backbones leads to changes in the conformation and hydrophobicity of the film surfaces. Our investigation offers a method to assess the impact of TMS-CD encapsulation on the control of 2D monolayer formation, with particular attention on the generation of stable PF monolayers for organic electronic devices.
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Affiliation(s)
| | | | | | | | | | - Aurica Farcas
- "Petru Poni" Institute of Macromolecular Chemistry, 700487 Iasi, Romania
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Farcas A, Resmerita AM, Aubert PH, Farcas F, Stoica I, Airinei A. The effect of permodified cyclodextrins encapsulation on the photophysical properties of a polyfluorene with randomly distributed electron-donor and rotaxane electron-acceptor units. Beilstein J Org Chem 2014; 10:2145-56. [PMID: 25246973 PMCID: PMC4168896 DOI: 10.3762/bjoc.10.222] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Accepted: 08/19/2014] [Indexed: 11/23/2022] Open
Abstract
We report on the synthesis as well as the optical, electrochemical and morphological properties of two polyrotaxanes (4a and 4b), which consist of electron-accepting 9,9-dicyanomethylenefluorene 1 as an inclusion complex in persilylated β- or γ-cyclodextrin (TMS-β-CD, TMS-γ-CD) (1a, 1b) and methyltriphenylamine as an electron-donating molecule. They are statistically distributed into the conjugated chains of 9,9-dioctylfluorene 3 and compared with those of the corresponding non-rotaxane 4 counterpart. Rotaxane formation results in improvements of the solubility, the thermal stability, and the photophysical properties. Polyrotaxanes 4a and 4b exhibited slightly red-shifted absorption bands with respect to the non-rotaxane 4 counterpart. The fluorescence lifetimes of polyrotaxanes follow a mono-exponential decay with a value of τ = 1.14 ns compared with the non-rotaxane, where a bi-exponential decay composed of a main component with a relative short time of τ1 = 0.88 (57.08%) and a minor component with a longer lifetime of τ2 = 1.56 ns (42.92%) were determined. The optical and electrochemical band gaps (ΔEg) as well as the ionization potential and electronic affinity characterized by smaller values compared to the values of any of the constituents. AFM reveals that the film surface of 4a and 4b displays a granular morphology with a lower dispersity supported by a smaller roughness exponent compared with the non-rotaxane counterpart.
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Affiliation(s)
- Aurica Farcas
- Inorganic Polymers, ''Petru Poni'' Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley, 700487 Iasi, Romania
| | - Ana-Maria Resmerita
- Inorganic Polymers, ''Petru Poni'' Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley, 700487 Iasi, Romania
| | - Pierre-Henri Aubert
- Laboratoire de Physicochimie des Polymères et des Interfaces (EA 2528), Institut des Matériaux, Université de Cergy-Pontoise, F-95031 Cergy-Pontoise Cedex, France
| | - Flavian Farcas
- "Gh. Asachi" Technical University, 61-63 Mangeron Blvd, 700050 Iasi, Romania
| | - Iuliana Stoica
- Inorganic Polymers, ''Petru Poni'' Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley, 700487 Iasi, Romania
| | - Anton Airinei
- Inorganic Polymers, ''Petru Poni'' Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley, 700487 Iasi, Romania
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Koyama Y, Matsumura T, Yui T, Ishitani O, Takata T. Fluorescence Control of Boron Enaminoketonate Using a Rotaxane Shuttle. Org Lett 2013; 15:4686-9. [DOI: 10.1021/ol401984j] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yasuhito Koyama
- Catalysis Research Center, Hokkaido University, N21 W10, Kita-ku, Sapporo 001-0021, Japan, Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 (H-126), Ookayama, Meguro, Tokyo 152-8552, Japan, Department of Material Science and Technology, Faculty of Engineering, Niigata University, Igarashi 2-8050, Niigata 950-2181, Japan, and Department of Chemistry, Tokyo Institute of Technology, 2-12-1 (E1-9), Ookayama, Meguro, Tokyo 152-8551, Japan
| | - Tohru Matsumura
- Catalysis Research Center, Hokkaido University, N21 W10, Kita-ku, Sapporo 001-0021, Japan, Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 (H-126), Ookayama, Meguro, Tokyo 152-8552, Japan, Department of Material Science and Technology, Faculty of Engineering, Niigata University, Igarashi 2-8050, Niigata 950-2181, Japan, and Department of Chemistry, Tokyo Institute of Technology, 2-12-1 (E1-9), Ookayama, Meguro, Tokyo 152-8551, Japan
| | - Tatsuto Yui
- Catalysis Research Center, Hokkaido University, N21 W10, Kita-ku, Sapporo 001-0021, Japan, Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 (H-126), Ookayama, Meguro, Tokyo 152-8552, Japan, Department of Material Science and Technology, Faculty of Engineering, Niigata University, Igarashi 2-8050, Niigata 950-2181, Japan, and Department of Chemistry, Tokyo Institute of Technology, 2-12-1 (E1-9), Ookayama, Meguro, Tokyo 152-8551, Japan
| | - Osamu Ishitani
- Catalysis Research Center, Hokkaido University, N21 W10, Kita-ku, Sapporo 001-0021, Japan, Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 (H-126), Ookayama, Meguro, Tokyo 152-8552, Japan, Department of Material Science and Technology, Faculty of Engineering, Niigata University, Igarashi 2-8050, Niigata 950-2181, Japan, and Department of Chemistry, Tokyo Institute of Technology, 2-12-1 (E1-9), Ookayama, Meguro, Tokyo 152-8551, Japan
| | - Toshikazu Takata
- Catalysis Research Center, Hokkaido University, N21 W10, Kita-ku, Sapporo 001-0021, Japan, Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 (H-126), Ookayama, Meguro, Tokyo 152-8552, Japan, Department of Material Science and Technology, Faculty of Engineering, Niigata University, Igarashi 2-8050, Niigata 950-2181, Japan, and Department of Chemistry, Tokyo Institute of Technology, 2-12-1 (E1-9), Ookayama, Meguro, Tokyo 152-8551, Japan
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Farcas A, Resmerita AM, Stefanache A, Balan M, Harabagiu V. Synthesis and characterization of low-molecular-weight π-conjugated polymers covered by persilylated β-cyclodextrin. Beilstein J Org Chem 2012; 8:1505-14. [PMID: 23019485 PMCID: PMC3458775 DOI: 10.3762/bjoc.8.170] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Accepted: 08/13/2012] [Indexed: 11/29/2022] Open
Abstract
The paper reports the preparation of a poly[2,7-(9,9-dioctylfluorene)-alt-5,5'-bithiophene/PS-βCD] (PDOF-BTc) polyrotaxane copolymer, through a Suzuki coupling reaction between the 5,5'-dibromo-2,2'-bithiophene (BT) inclusion complex with persilylated β-cyclodextrin (PS-βCD), and 9,9-dioctylfluorene-2,7-bis(trimethylene borate) (DOF) as the blocking group. The chemical structure and the thermal and morphological properties of the resulting polyrotaxane were investigated by using NMR and FT-IR spectroscopy, TGA, DSC and AFM analysis. The encapsulation of BT inside the PS-βCD cavity results in improvements in the solubility, as well as in different surface morphology and thermal properties of the PDOF-BTc rotaxane copolymer compared to its noncomplexed PDOF-BT homologue. In contrast, the number-average molecular weight (Mn) of PDOF-BTc rotaxane copolymer indicated lower values suggesting that the condensation reaction is subjected to steric effects of the bulkier silylated groups, affecting the ability of the diborate groups from the DOF molecule to partially penetrate the PS-βCD cavity.
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Affiliation(s)
- Aurica Farcas
- Inorganic Polymers, ''Petru Poni'' Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley, 700487-Iasi, Romania
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