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Your search keyword '"Takeharu Haino"' showing total 13 results
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13 results on '"Takeharu Haino"'

1. Self-complementary Structure of Bisporphyrin Dimer

Author

Takeharu Haino, Naoyuki Hisano, and Takehiro Hirao

Subjects
chemistry.chemical_compound, Crystallography, chemistry, Dimer, Amide, Intermolecular force, Molecule, General Chemistry, Crystal structure, Self-assembly, Porphyrin
Abstract

The crystal structure of a bisporphyrin cleft molecule revealed that the head-to-head dimeric structure is directed by the intermolecular self-complementary hydrogen-bonding interactions of amide g...

Published
2021
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2. Blueish-white-light-emitting Nanographenes Developed by Pd-catalyzed Suzuki-Miyaura Cross Coupling Reactions

Author

Takeharu Haino, Ikuya Matsumoto, Shohei Nishitani, and Ryo Sekiya

Subjects
010405 organic chemistry, Chemistry, Graphene, General Chemistry, 010402 general chemistry, Photochemistry, 01 natural sciences, Coupling reaction, 0104 chemical sciences, Catalysis, law.invention, chemistry.chemical_compound, law, White light, Pyrene, Hybrid material
Abstract

Top-down methods produce nanographenes with many carboxy groups on their edges. These functional groups can be utilized for developing multichromophoric systems. As proof of concept, pyrene is inst...

Published
2021
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3. Programmed Dynamic Covalent Chemistry System of Addition-condensation Reaction of Phenols and Aldehydes

Author

Takeharu Haino, Daisuke Shimoyama, Hiroto Kudo, and Ryo Sekiya

Subjects
Ethanol, 010405 organic chemistry, Chemistry, Dynamic covalent chemistry, General Chemistry, Resorcinol, 010402 general chemistry, Condensation reaction, 01 natural sciences, Reversible reaction, 0104 chemical sciences, chemistry.chemical_compound, Calixarene, Polymer chemistry, lipids (amino acids, peptides, and proteins), Phenols, Hydrogen chloride
Abstract

Application of a dynamic covalent chemistry strategy to the reversible reaction system of resorcinol and α, ω-alkanedials [(CH2)m(CHO)2] (m = 2–10) in ethanol in the presence of hydrogen chloride (...

Published
2021
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4. Supramolecular Polymerization and Functions of Isoxazole Ring Monomers

Author

Takeharu Haino and Takehiro Hirao

Subjects
Physics::Biological Physics, Quantitative Biology::Biomolecules, 010405 organic chemistry, Supramolecular chemistry, General Chemistry, 010402 general chemistry, Ring (chemistry), 01 natural sciences, 0104 chemical sciences, Condensed Matter::Soft Condensed Matter, Quantitative Biology::Subcellular Processes, Solvent, chemistry.chemical_compound, Monomer, chemistry, Polymerization, Polymer chemistry, Physics::Atomic Physics, Isoxazole
Abstract

Head-to-tail dipole-dipole arrays of isoxazole rings lead to supramolecular helical assemblies where the assembly and disassembly are regulable based on temperature and solvent properties. The coop...

Published
2020
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5. Organogelators of 5,17-Difunctionalized Calix[4]arenes

Author

Ryo Sekiya, Takeharu Haino, Takayuki Ichikawa, Shigeru Yamago, Masatoshi Tosaka, Takashi Nishino, Lai Nang Duy, and Takuya Matsumoto

Subjects
010405 organic chemistry, Chemistry, Organic chemistry, General Chemistry, 010402 general chemistry, 01 natural sciences, 0104 chemical sciences
Abstract

5,17-Difunctionalized calix[4]arenes 1a,b were found to function as low molecular-weight organic gelators. They formed organogels with a variety of organic solvents. SEM images showed 1a formed sta...

Published
2019
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6. Self-complementary Structure of Bisporphyrin Dimer.

Author

Naoyuki Hisano, Takehiro Hirao, and Takeharu Haino

Abstract

The crystal structure of a bisporphyrin cleft molecule revealed that the head-to-head dimeric structure is directed by the intermolecular self-complementary hydrogen-bonding interactions of amide groups and π-π stacking interactions. The UV/ Vis absorption spectrum of the homodimeric structure in the solid-state resulted in a broad Soret band. Time-dependent density functional theory (TD-DFT) calculation of the dimer indicated that an intra- and intermolecular charge transfer transition as well as a π-π* transition were responsible for the observed broad Soret band. [ABSTRACT FROM AUTHOR]

Published
2021
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7. Self-assembly of Oligo(phenylisoxazolyl)benzenes Induced by Multiple Dipole–Dipole Interactions

Author

Takeharu Haino, Toshiaki Ikeda, Masahiro Tanaka, Yuko Ueda, and Takehiro Hirao

Subjects
Dipole, Chemistry, Chemical physics, Intermolecular force, General Chemistry, Self-assembly
Abstract

We have demonstrated that oligo(phenylisoxazolyl)benzenes 3–6 formed polymeric assemblies. The intermolecular associations were discussed using thermodynamic parameters. The formation of the polyme...

Published
2014
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8. Synthesis of Medium Ring 1,5-Dienes

Author

Yoshimasa Fukazawa, Shuji Usui, Mitsuaki Kodama, Tatsuhiko Hayashibara, Takeharu Haino, and Yoshimasa Hirai

Subjects
chemistry.chemical_classification, Allylic rearrangement, Intramolecular reaction, Double bond, Stereochemistry, Enthalpy, chemistry.chemical_element, General Chemistry, Primary alcohol, Sulfur, Medicinal chemistry, Radical cyclization, chemistry, Aliphatic compound
Abstract

Medium ring compounds (9 to 11 membered rings) having endo (E or Z) and exo double bonds at 1,5-positions were synthesized by intramolecular cyclization of the ω-functionalyzed allylic anion stabilized by a sulfur atom. The yields of cyclization were related not only with the cyclization enthalpy (steric strain of the resultant cyclic compounds) but also with entropy factor.

Published
1992
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9. Synthesis and Structure of 1,10-o-Benzeno[2.2]orthocyclophane-o-quinones. Evaluation of Attractive Energy between Donor and Acceptor

Author

Takeharu Haino, Tsuneyuki Nakamura, Yoshimasa Fukazawa, and Shuji Usui

Subjects
Intramolecular reaction, Stereochemistry, Chemistry, Intramolecular force, General Chemistry, O quinones, Acceptor, Medicinal chemistry, Quinone
Abstract

The title compounds were synthesized to evaluate the intramolecular charge transfer interaction between the donor (dimethoxybenzene) and the acceptor(o-benzoquinone) of defined arrangement.

Published
1991
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10. Tether-assisted Synthesis of [3]Rotaxane by Olefin Metathesis

Author

Takeharu Haino, Yukimi Yawata, Yoshimasa Fukazawa, and Hajime Iwamoto

Subjects
chemistry.chemical_classification, Rotaxane, Olefin metathesis, Chemistry, Organic chemistry, General Chemistry, Linker, Crown ether
Abstract

The tether-assisted synthesis of [3]rotaxane by olefin metathesis is described. The bis(crown ether)s, in which two crown ethers are connected by a linker, were converted to tethered rotaxanes, fol...

Published
2010
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11. Synthesis of a Molecular Container Having an Open Door that Closes on Guest Binding

Author

Yoshimasa Fukazawa, Takeharu Haino, Mitsuru Kouchi, Masaki Hirakata, Hajime Iwamoto, and Kahoru Niimi

Subjects
Stereochemistry, Chemistry, Cationic polymerization, General Chemistry, Ring (chemistry), Container (type theory), Combinatorial chemistry
Abstract

A molecular container composed of monodeoxy-calix[4]arene and calix[4]arene is synthesized. The host binds planar cationic guests. The deoxy-aromatic ring acts as an open door when the guest is abs...

Published
2008
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12. Enantioselective Recognition of Calix[5]arene-based Artificial Receptor Bearing Chiral Macrocycle for Chiral Ethyltrimethylammonium Salts

Author

Hiroyuki Fukuoka, Yoshimasa Fukazawa, Masakazu Katayama, and Takeharu Haino

Subjects
Chemistry, Stereochemistry, Enantioselective synthesis, General Chemistry, Receptor, Strong binding
Abstract

Calix[5]arene-based artificial receptor 1 capped with chiral macrocycle 4 was synthesized and showed strong binding toward ethyltrimethylammonium salts via cation/π and hydrogen-bonding interaction...

Published
2007
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13. Synthesis and Properties of Novel Optically Active Platinum-containing Poly(phenyleneethynylene)s.

Author

Yoshinori Otaki, Manabu Marumoto, Yu Miyagi, Takehiro Hirao, Takeharu Haino, and Fumio Sanda

Abstract

The dehydrochlorination coupling polymerization of N-(3,5- diethynylbenzoyl)-L-alanine dodecylamide 1 with platinum (Pt) chlorides having pyridine, bipyridine, and phenanthroline ligands 2a2d gave novel optically active poly(phenyleneethynylene) s [poly(1-2a)poly( 1-2d)] bearing Pt in the main chains. The Z-average diameters of the polymers ranged from 453 to 1081 nm. Poly(1-2a) exhibited CD signals assignable to aggregates, and formed regulated twisted structures with height of 540 ± 70 nm and pitch of 62 ± 6 nm, which were confirmed by AFM measurements. [ABSTRACT FROM AUTHOR]

Published
2016
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