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Your search keyword '"Hiroaki Ozawa"' showing total 7 results
Start Over Author "Hiroaki Ozawa" Journal chemistry letters
7 results on '"Hiroaki Ozawa"'

1. 'Janus-type' Ruthenium Complex Bearing Both Phosphonic Acids and Pyrene Groups for Functionalization of ITO and HOPG Surfaces

Author

Hiroaki Ozawa, Mariko Matsunaga, Kai Yoshikawa, Masa-aki Haga, Li Yang, and Mayuko Koumoto

Subjects
chemistry.chemical_compound, chemistry, Pyrene, Surface modification, chemistry.chemical_element, General Chemistry, Janus, Photochemistry, digestive system, Ruthenium
Abstract

A novel Janus-type ruthenium complex bearing both phosphonic acid and pyrene groups was tethered to both ITO and HOPG surfaces in different tethering modes. On the ITO surface, the phosphonic group...

Published
2015
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2. pH-Dependent Electrochemical Behaviors of Ruthenium Complex/Carbon Nanotube Composites on Platinum and Pencil-lead Electrodes

Author

Hiroaki Ozawa, Masa-aki Haga, Kazuki Kuroiwa, and Takumi Hasegawa

Subjects
chemistry.chemical_element, Ph dependent, General Chemistry, Carbon nanotube, Electrochemistry, law.invention, Ruthenium, chemistry.chemical_compound, chemistry, Chemical engineering, law, Electrode, Pyridine, Pyrene, Platinum
Abstract

We report the proton-coupled electron-transfer reaction of ruthenium complex bearing bis(benzimidazolyl)pyridine and pyrene anchor on single-walled carbon nanotubes (SWNTs). The complex was attache...

Published
2013
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3. Different Chiral Selective Recognition/Extraction of (n,m)Single-walled Carbon Nanotubes Using Copolymers Carrying a Carbazole or Fluorene Moiety

Author

Suhee Song, Naotoshi Nakashima, Hiroaki Ozawa, Hongsuk Suh, and Tsuyohiko Fujigaya

Subjects
Carbazole, Extraction (chemistry), General Chemistry, Carbon nanotube, Fluorene, law.invention, chemistry.chemical_compound, chemistry, law, Polymer chemistry, Copolymer, Thiophene, Organic chemistry, Moiety
Abstract

We describe the finding that copolymers having a long-double chain carbazole or fluorene group connected to benzothiadiazole with thiophene linkers show a different chiral selective (n,m)single-wal...

Published
2011
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4. One-pot Separation of Highly Enriched (6,5)-Single-walled Carbon Nanotubes Using a Fluorene-based Copolymer

Author

Tsuyohiko Fujigaya, Natsuko Ide, Naotoshi Nakashima, Yasuro Niidome, and Hiroaki Ozawa

Subjects
chemistry.chemical_compound, Bipyridine, chemistry, law, Copolymer, Organic chemistry, General Chemistry, Carbon nanotube, Fluorene, law.invention
Abstract

We now describe the finding that a copolymer of 9,9-dioctylfluorenyl-2,7-diyl and bipyridine (BPy) can extract in “one-pot” ≈96–97%-enriched (6,5)-SWNTs in m-xylene and p-xylene not containing meta...

Published
2011
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5. Preparation of Long Conjugated Porphyrin Polymers with Gold Nanoparticles at Both Ends as Electronic and/or Photonic Molecular Wires

Author

Takuji Ogawa, Hirofumi Tanaka, Masahiro Kawao, and Hiroaki Ozawa

Subjects
chemistry.chemical_classification, Nanocomposite, Chemistry, business.industry, Nanotechnology, General Chemistry, Polymer, Conjugated system, Porphyrin, Molecular wire, chemistry.chemical_compound, Colloidal gold, Photonics, business
Abstract

Nanocomposites of long conjugated porphyrin polymers with both ends substituted by gold nanoparticles were prepared by mixing a polymer bearing thiol groups at both ends with gold nanoparticles pro...

Published
2009
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6. "Janus-type" Ruthenium Complex Bearing Both Phosphonic Acids and Pyrene Groups for Functionalization of ITO and HOPG Surfaces.

Author

Li Yang, Hiroaki Ozawa, Mayuko Koumoto, Kai Yoshikawa, Mariko Matsunaga, and Masa-aki Haga

Abstract

A novel Janus-type ruthenium complex bearing both phosphonic acid and pyrene groups was tethered to both ITO and HOPG surfaces in different tethering modes. On the ITO surface, the phosphonic groups were selectively attached to the ITO, resulting in the hydrophobic surface because of the exposed pyrene groups on the top. On the other hand, on the HOPG surface, pyrene groups interacted with the HOPG surface through noncovalent interaction, resulting in a hydrophilic surface exposing phosphonic acid groups. This selectivity makes it possible to fabricate redoxactive ruthenium complex and graphene composite by layer-bylayer growth of molecular units. [ABSTRACT FROM AUTHOR]

Published
2015
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