理数情報教育系

Koji Kubono

  (久保埜 公二)

Profile Information

Affiliation
Professor, Division of Math, Sciences, and Information Technology in Education, Osaka Kyoiku University
Degree
理学修士(京都大学)
博士(理学)(京都大学)
工学士(岐阜大学)

Contact information
kubonocc.osaka-kyoiku.ac.jp
Researcher number
00269531
J-GLOBAL ID
200901003882805635
researchmap Member ID
1000189927

Research History

 5

Papers

 63
  • Mami Isobe, Yukiyasu Kashiwagi, Koji Kubono
    Acta Crystallographica Section E Crystallographic Communications, 80(8) 840-844, Jul 9, 2024  Peer-reviewedLast author
    The asymmetric unit of the title compound is composed of two independent ion pairs of 4-(dimethylamino)pyridin-1-ium 8-hydroxyquinoline-5-sulfonate (HDMAP+·HqSA, C7H11N2 +·C9H6NO4S) and neutral N,N-dimethylpyridin-4-amine molecules (DMAP, C7H10N2), co-crystallized as a 1:1:1 HDMAP+:HqSA:DMAP adduct in the monoclinic system, space group Pc. The compound has a layered structure, including cation layers of HDMAP+ with DMAP and anion layers of HqSA in the crystal. In the cation layer, there are intermolecular N—H...N hydrogen bonds between the protonated HDMAP+ molecule and the neutral DMAP molecule. In the anion layer, each HqSA is surrounded by other six HqSA, where the planar network structure is formed by intermolecular O—H...O and C—H...O hydrogen bonds. The cation and anion layers are linked by intermolecular C—H...O hydrogen bonds and C—H...π interactions.
  • Keita Tani, Kako Ueno, Miyuki E. Masaki, Masatsugu Taneda, Kazushige Hori, Koji Kubono, Kenta Goto, Fumito Tani, Yukiyasu Kashiwagi, Takunori Harada
    Chemistry Letters, 52(11) 858-860, Nov 5, 2023  Peer-reviewed
  • Koji Kubono, Ryoichi Tanaka, Yukiyasu Kashiwagi, Keita Tani, Kunihiko Yokoi
    Acta Crystallographica Section E Crystallographic Communications, 79(8) 726-729, Aug 1, 2023  Peer-reviewedLead authorCorresponding author
    In the title compound, [Na(C22H19N4O4S)(CH3CN)]n, the NaI atom adopts a distorted square-pyramidal coordination geometry, formed by one N and one O atom of the qunolinol moiety in the ligand, two O atoms of sulfonate moieties of two adjacent ligands and the N atom of the coordinated acetonitrile solvent. The NaI atom is located well above the mean basal plane of the square-based pyramid. The apical position is occupied by a sulfonate O atom of a neighboring ligand. Three N atoms of the bis(pyridin-2-ylmethyl)amine moiety in the ligand are not coordinated by the sodium atom. The molecule forms an intramolecular bifurcated O—H...[N(tertiary amine),N(pyridine)] hydrogen bond, generating S(6) and S(5) rings. In the crystal, four molecules are linked by four Na—O(sulfonato) bridged coordination bonds, forming a supramolecular centrosymmetric tetramer unit comprising an eight-membered ring, and generating a two-dimensional network sheet. The molecules of different sheets form intermolecular C—H...O hydrogen bonds, and thereby a three-dimensional network structure.
  • Koji Kubono, Keita Tani, Yukiyasu Kashiwagi, Fumito Tani, Taisuke Matsumoto
    Acta Crystallographica, 78(3) 477-480, May, 2022  Peer-reviewedLead author
    The title compound, C33H33N3, is a carbazolophane, which is a cyclophane composed of two carbazole fragments. It has a planar chirality but crystallizes as a racemate in the space group P-1. The molecule adopts an anti-configuration, in which two carbazole fragments are partially overlapped. Both carbazole ring systems are slightly bent, with the C atoms at 3-positions showing the largest deviations from the mean planes. The dihedral angle between two carbazole fragments is 5.19 (3)°, allowing an intramolecular slipped π–π interaction [Cg...Cg = 3.2514 (8) Å]. In the crystal, the molecules are linked via intermolecular C—H...N hydrogen bonds and C—H...π interactions into a network sheet parallel to the ab plane. The molecules of different sheets form other C—H...π interactions, thus forming a three-dimensional network.
  • Masatsugu Taneda, Masato Nishi, Koji Kubono, Yukiyasu Kashiwagi, Taisuke Matsumoto
    Acta Crystallographica, 78(3) 449-452, Apr, 2022  Peer-reviewed
    The mol-ecule of the title compound, C16H14N2O, contains an essentially planar indole ring system and a phenyl ring. In the crystal, the mol-ecules are linked by a weak inter-molecular C-H⋯O hydrogen bond and C-H⋯π inter-actions, forming a one-dimensional column structure along the b-axis direction. These columns are linked by other C-H⋯π inter-actions, forming a two-dimensional network structure.

Misc.

 9

Books and Other Publications

 12

Presentations

 46

Research Projects

 21