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Your search keyword '"Masashi Kawaharada"' showing total 2 results
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2 results on '"Masashi Kawaharada"'

1. Application of soft X-ray microspectroscopic analyses to architectural structures – a case study on ceramic-tile/adhesive/mortar-structured composite materials

Author

Masaki Oura, Hidekazu Takano, Satoru Hamamoto, Takaki Hatsui, Haruhisa Kurauchi, Hidetoshi Okano, Masashi Kawaharada, Kazushi Yokoyama, Makina Yabashi, Masato Akimoto, and Tetsuya Ishikawa

Subjects
Mechanics of Materials, Materials Chemistry, Surfaces and Interfaces, General Chemistry, Surfaces, Coatings and Films
Published
2022
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2. Structural alteration of hybrid supramolecular capsule induced by guest encapsulation

Author

Yuki Nito, Kenji Kobayashi, Hikaru Takaya, Masashi Kawaharada, and Masamichi Yamanaka

Subjects
Hydrogen bond, Kinetics, Supramolecular chemistry, Cavitand, chemistry.chemical_element, macromolecular substances, General Chemistry, Nuclear magnetic resonance spectroscopy, Biochemistry, Catalysis, Crystallography, Colloid and Surface Chemistry, chemistry, Platinum, Two-dimensional nuclear magnetic resonance spectroscopy, Palladium
Abstract

Heterofunctionalized C(2v) symmetrical cavitand 1 with 4-pyridylethynyl and 3-carbamoylphenyl groups in alternating arrangement was designed and synthesized. A 1:1 mixture of the cavitand 1 and a cis-coordinated palladium(II) or platinum(II) complex self-assembled into a hybrid supramolecular capsule via both metal-ligand coordination bonds and hydrogen bonds. Formation of the capsular assembly was confirmed by NMR spectroscopy and mass spectrometry. The hybrid capsule encapsulated the appropriate guest, the molecular sizes of which fit the size of the capsular cavity. Structural alteration of the hybrid capsule was induced by the guest encapsulation. A C(2h) structure for the encapsulation complex was assigned by 2D NMR spectra analysis. Thermodynamic and kinetic properties of the guest encapsulation were investigated. The kinetics of in/out guest exchange was strongly influenced by hydrogen bonding in the hybrid capsule.

Published
2011

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