A01 Otsubo Kazuya

Kazuya Otsubo

Participating A01


Division of Chemistry, Graduate School of Science, Kyoto University


Assistant Professor



Research Project

Investigation of physical properties in dimensional crossover complexes with asymmetric components


Recently, we have studied synthesis and investigation of the dimensional-crossover complexes based on the one-dimensional (1D) mixed-valence transition-metal complex. We succeeded in syntheses of mixed-valence metal–organic nanotubes and triple-helix complex, which straddle between 1D and 2D electronic systems. In this project, we aim realization of the functionality in dimensional crossover complexes utilizing mixed-valence metal–organic nanotube with asymmetric components and artificial triple-helix complex. Especially, we investigate following subjects: (1) Fine-tuning of porous character, water-cluster formation and proton/water dynamics in asymmetric nanospace of metal–organic nanotube with chiral components. (2) Fabrication of chiral liquid-crystal phase showing circularly polarized luminescence and specific electronic properties utilizing artificial-triple-helix complex with controlled its helicity.

Research Areas

Inorganic Chemistry, Coordination Chemistry, Solid-State Chemistry


Dimensional Crossover Complexes, Nanotube, Helicate


[8] Surface morphology-induced spin-crossover-inactive high-spin state in a coordination framework,
Shun Sakaida; Kazuya Otsubo; Ken-ichi Otake; Shogo Kawaguchi; Mitsuhiko Maesato; Susumu Kitagawa; Hiroshi Kitagawa, Chem. Commun., 57, , 2021
DOI: 10.1039/D0CC06682F.
[7] A mixed-valent metal–organic ladder linked by pyrazine,
Ken-ichi Otake; Kazuya Otsubo; Hiroshi Kitagawa, Journal of Physics: Condensed Matter, 33, 034002, 2021
DOI: 10.1088/1361-648X/abbbc7.


[6] Crystal size effect on spin-crossover behavior of {Fe(py)2[Pt(CN)4]} (py= pyridine) monitored by Raman spectroscopy,
Shun Sakaida; Kazuya Otsubo; Mitsuhiko Maesato; Hiroshi Kitagawa, Inorg. Chem., 59, 23, 16819 - 16823, 2020
DOI: 10.1021/acs.inorgchem.0c02874.
[5] Confined water-mediated high proton conduction in hydrophobic channel of a synthetic nanotube,
Ken-ichi Otake; Kazuya Otsubo; Tokutaro Komatsu; Shun Dekura; Jared M Taylor; Ryuichi Ikeda; Kunihisa Sugimoto; Akihiko Fujiwara; Chien-Pin Chou; Aditya Wibawa Sakti; Yoshifumi Nishimura; Hiromi Nakai; Hiroshi Kitagawa, Nat. Commun., 11, 843, 2020
DOI: 10.1038/s41467-020-14627-z.
[4] Remarkably Enhanced Proton Conduction of {NBu2(CH2COOH)2}[MnCr(ox)3] by Multiplication of Carboxyl Carrier in the Cation,
Hisashi Ōkawa; Kazuya Otsubo; Yukihiro Yoshida; Hiroshi Kitagawa, Chem. Commun., 56, 6138 - 6140, 2020
DOI: 10.1039/D0CC02192J.


[3] A Novel Platinum(III)–Platinum(III) Neutral Dimer Complex, Pt2(cdtb)4I2 (cdtb: 4-Cyanodithiobenzoate),
Hayato Moriyama; Kazuya Otsubo; Kentaro Aoki; Mitsuhiko Maesato; Kunihisa Sugimoto; Hiroshi Kitagawa, Chem. Lett., 48, 9, 1035 - 1037, 2019
DOI: 10.1246/cl.190355.


[2] Modular Cavities: Induced Fit of Polar and Apolar Guests into Halogen-Based Receptors,
Kentaro Aoki; Kazuya Otsubo; Garry S Hanan; Kunihisa Sugimoto; Hiroshi Kitagawa, Inorg. Chem., 57, 11, 6222 - 6225, 2018
DOI: 10.1021/acs.inorgchem.8b01069.


[1] Nanoscale crystalline architectures of Hofmann-type metal–organic frameworks,
Kazuya Otsubo; Tomoyuki Haraguchi; Hiroshi Kitagawa, Coord. Chem. Rev., 346, 123 - 138, 2017
DOI: 10.1016/j.ccr.2017.03.022.