A02 Hayato Sakai

Hayato Sakai

Participating A02


Department of Chemistry, Faculty of Science and Technology, Keio University


Assistant Professor



Research Project

Construction of Chirality-Controllable MOF Possessing Singlet Fission Property for New Photofunctional Materials


Taku Hasobe (Associate Professor, Department of Chemistry, Faculty of Science and Technology, Keio University)


MOFs are one of porous materials, which are useful platform for construction of optoelectronics materials because photofunctional organic compounds can be introduced as ligands into the structures. Especially, MOF can be easily changed in the characteristics by an exclusive property shown by axial ligands called ligand exchange unlike other materials. So that means that the use of chiral ligands as the axial ligands also allows control of the chiral properties of porous space in MOFs. On the other hand, singlet fission is one of multi-exciton generation dynamics due to generating two excitons from one photon. Since the value of quantum yield reaches up to 200%, efficiency of the general reaction can be significantly increased. In this project, by collaboration of singlet fission and control of symmetry using ligand exchange, we will develop new photofunctinal space in MOF.


Research Areas

Organic Chemistry, Supramolecular Chemistry, Photochemistry


Singlet Fission, Metal-Organic Frameworks, Host-Guest Chemistry


[10] Systematic Control of Structural and Photophysical Properties of π-​Extended Mono- and Bis-​BODIPY Derivatives,
Hiroaki Ito; HayatoSakai; Yasutaka Suzuki; Jun Kawamata; Taku Hasobe, Chem. Eur. J., 26, 316 – 325, 2020
DOI: 10.1002/chem.201904282.
[9] Electrochemical Properties and Excited-State Dynamics of Azaperylene Derivatives,
Akitsu Hirono; Hayato Sakai; Shuntaro Kochi; Tohru Sato; Taku Hasobe, J. Phys. Chem. B, 124, 9921 – 9930, 2020
DOI: 10.1021/acs.jpcb.0c07532.


[8] Controlled Orientations of Neighboring Tetracene Units by MixedSelf-Assembled Monolayers on Gold Nanoclusters for High-Yieldand Long-Lived Triplet Excited States through Singlet Fission,
Toshiyuki Saegusa; Hayato Sakai; Hiroki Nagashima; Yasuhiro Kobori; Nikolai V. Tkachenko; Taku Hasobe, J. Am. Chem. Soc., 141, 14720 – 14727, 2019
DOI: 10.1021/jacs.9b06567.
[7] Synthesis and Electrochemical and Photophysical Properties of Azaterrylene Derivatives,
Akitsu Hirono; Hayato Sakai; Taku Hasobe, Chem. Asian. J., 14, 1754 – 1762, 2019
DOI: 10.1002/asia.201801410.


[6] Multiexciton Dynamics Depending on Intramolecular Orientations in Pentacene Dimers: Recombination and Dissociation of Correlated Triplet Pairs,
Hayato Sakai; Ryutaro Inaya; Hiroki Nagashima; Shunta Nakamura; Yasuhiro Kobori; Nikolai V. Tkachenko; Taku Hasobe, J. Phys. Chem. Lett., 9, 12, 3354 – 3360, 2018
DOI: 10.1021/acs.jpclett.8b01184.
[5] Concentration-​dependent photophysical switching in mixed self-​assembled monolayers of pentacene and perylenediimide on gold nanoclusters,
Daiki Kato; Hayato Sakai; Yasuyuki Araki; Takehiko Wada; Nikolai V. Tkachenko; Taku Hasobe, Phys. Chem. Chem. Phys., 20, 8695 – 8706 , 2018
DOI: 10.1039/C8CP00174J.
[4] Inter- and Intramolecular Electron-Transfer Reduction Properties of Coronenediimide Derivatives via Photoinduced Processes,
Motoki Yoshida; Hayato Sakai; Kei Ohkubo; Shunichi Fukuzumi; Taku Hasobe, J. Phys. Chem. C, 122, 25, 13333 – 13346, 2018
DOI: 10.1021/acs.jpcc.7b09817.
[3] Significant Enhancement of Absorption and Luminescence Dissymmetry Factors in the Far‐Red Region: A Zinc(II) Homoleptic Helicate Formed by a Pair of Achiral Dipyrromethene Ligands,
Hiroaki Ito; Hayato Sakai; Yoshinori Okayasu; Junpei Yuasa; Tadashi Mori; Taku Hasobe, Chem. Eur. J., 24, 16889 – 16894, 2018
DOI: 10.1002/chem.201804171.


[2] Control of the electrochemical and photophysical properties of N-substituted benzo[ghi]perylene derivatives,
Kokichi Tokuo; Hayato Sakai; Tomo Sakanoue; Taishi Takenobu; Yasuyuki Araki; Takehiko Wada; Taku Hasobe, Mater. Chem. Front. , 1, 2299 – 2308 , 2017
DOI: 10.1039/C7QM00301C.
[1] Synthesis, Structural and Photophysical Properties of Pentacene Alkanethiolate Monolayer-Protected Gold Nanoclusters and Nanorods: Supramolecular Intercalation and Photoinduced Electron Transfer with C60,
Daiki Kato; Hayato Sasaki; Toshiyuki Saegusa; Nikolai V. Tkachenko; Taku Hasobe, J. Phys. Chem. C, 121, 16, 9043 – 9052, 2017
DOI: 10.1021/acs.jpcc.7b01164.