1
|
Kutsumizu S, Kawafuchi A, Yamamura Y, Udagawa T, Otaki T, Masuda M, Miwa Y, Saito K. Stabilization of Bicontinuous Cubic Phase and Its Two-Sided Nature Produced by Use of Siloxane Tails and Introduction of Molecular Nonsymmetry. Chemistry 2021; 27:10293-10302. [PMID: 34031926 DOI: 10.1002/chem.202101233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Indexed: 11/10/2022]
Abstract
A recent intriguing finding that a helical network arrangement forms the bicontinuous cubic phase is attracting great attention for the possibility of new routes to asymmetric synthesis by achiral molecules. However, the design of the molecular structure for the cubic phase is still unrevealed. In this work, a nonsymmetric core molecule with larger naphthalene and smaller benzene moieties at each side of the central linkage and the same disiloxanyldecyloxy terminal at both terminals is shown to be the first example of molecule forming both single-layered and double-layered core assembly modes in the Ia3d phase as a single molecule system. The molecule forms the former mode at high temperatures as a thermodynamically stable phase, similarly to the symmetric naphthalene core system, whereas, on cooling below a temperature (∼350 K), a metastable Ia3d phase forms a double-layered core state down to room temperature, which is common to the benzene core system. As another effect of the nonsymmetric core, the cubic phase is maintained at room temperature for more than 100 days with slight distortion. Infrared spectral studies and quantum chemical calculations suggested the easy transformation between the two core assembly modes. The core nonsymmetry can be a versatile fine-tuning of the core assembly mode and phase stability for the cubic phase molecules.
Collapse
Affiliation(s)
- Shoichi Kutsumizu
- Department of Chemistry and Biomolecular Science Faculty of Engineering, Gifu University Yanagido, Gifu, 501-1193, Japan
| | - Akane Kawafuchi
- Department of Chemistry and Biomolecular Science Faculty of Engineering, Gifu University Yanagido, Gifu, 501-1193, Japan
| | - Yasuhisa Yamamura
- Department of Chemistry Faculty of Pure and Applied Sciences, University of Tsukuba Tsukuba, Ibaraki, 305-8571, Japan
| | - Taro Udagawa
- Department of Chemistry and Biomolecular Science Faculty of Engineering, Gifu University Yanagido, Gifu, 501-1193, Japan
| | - Takashi Otaki
- Department of Chemistry and Biomolecular Science Faculty of Engineering, Gifu University Yanagido, Gifu, 501-1193, Japan
| | - Masaki Masuda
- Department of Chemistry and Biomolecular Science Faculty of Engineering, Gifu University Yanagido, Gifu, 501-1193, Japan
| | - Yohei Miwa
- Department of Chemistry and Biomolecular Science Faculty of Engineering, Gifu University Yanagido, Gifu, 501-1193, Japan
| | - Kazuya Saito
- Department of Chemistry Faculty of Pure and Applied Sciences, University of Tsukuba Tsukuba, Ibaraki, 305-8571, Japan
| |
Collapse
|
2
|
Amemori S, Kikuchi K, Mizuno M. Poly(dimethylsiloxane) and oligo(dimethylsiloxane) solvent effects on aromatic donor-acceptor interactions. Chem Commun (Camb) 2021; 57:1141-1144. [PMID: 33410835 DOI: 10.1039/d0cc06638a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Solvents with a wide range of polarities, including poly(dimethylsiloxane) and oligo(dimethylsiloxane), were used to evaluate aromatic donor-acceptor interactions between pyrene and pyromellitic diimide derivatives. The donor-acceptor interactions were stronger in siloxane solvents than in aliphatic solvents, possibly because of the poor solubility of the aromatics in siloxanes.
Collapse
Affiliation(s)
- Shogo Amemori
- NanoMaterials Research Institute, Kanazawa University, Kanazawa 920-1192, Japan.
| | | | | |
Collapse
|