Ken-ichi Yamashita
@ken1yama.bsky.social
Associate Professor
Dept. of Chemistry, Grad. School of Science, The University of Osaka
Organic Chemistry, Coordination Chemistry, Supramolecular Chemistry, Porphyrinoid
https://orcid.org/0000-0001-7270-1234
Dept. of Chemistry, Grad. School of Science, The University of Osaka
Organic Chemistry, Coordination Chemistry, Supramolecular Chemistry, Porphyrinoid
https://orcid.org/0000-0001-7270-1234
Excited to share our new paper in Eur. J. Inorg. Chem.! 🎉
Proud to collaborate with an amazing international team on this research!
chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/... （Open Access）
Proud to collaborate with an amazing international team on this research!
chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/... （Open Access）
Synthesis and Characterization of (R)‐ and (S)‐1,1′‐Bi‐2‐Naphtholato Coordinated Gallium(III) Porphyrins and Their Chiroptical Properties
Gallium porphyrins bearing chiral bi-2-naphtholato ligands are synthesized and characterized. Single-crystal X-ray diffraction and various spectroscopic analyses confirmed their structures. Circular ...
chemistry-europe.onlinelibrary.wiley.com
October 23, 2025 at 2:16 PM
Excited to share our new paper in Eur. J. Inorg. Chem.! 🎉
Proud to collaborate with an amazing international team on this research!
chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/... （Open Access）
Proud to collaborate with an amazing international team on this research!
chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/... （Open Access）
Delighted to announce our new research published in #ChemEurJ —selected as a Hot Paper!
This marks an important milestone as my first publication outside porphyrinoid chemistry. Together with Rio (PhD student), we've pioneered new insights into methine-bridged poly/oligothiophenes.
(Open Access)
This marks an important milestone as my first publication outside porphyrinoid chemistry. Together with Rio (PhD student), we've pioneered new insights into methine-bridged poly/oligothiophenes.
(Open Access)
Effect of Chalcogen Interaction on the Structure of Methine‐Bridged Trichalcogenophenes
The stereochemistry of methine-bridged trichalcogenophenes was elucidated through comprehensive structural analyses. Trithiophene showed a strong preference for the ZZ configuration, whereas its trif...
doi.org
June 5, 2025 at 10:05 AM
Delighted to announce our new research published in #ChemEurJ —selected as a Hot Paper!
This marks an important milestone as my first publication outside porphyrinoid chemistry. Together with Rio (PhD student), we've pioneered new insights into methine-bridged poly/oligothiophenes.
(Open Access)
This marks an important milestone as my first publication outside porphyrinoid chemistry. Together with Rio (PhD student), we've pioneered new insights into methine-bridged poly/oligothiophenes.
(Open Access)
When Maika synthesized thienyl-substituted isophlorins for another purpose, she noticed they showed weaker antiaromaticity than others. This sparked our investigation into the relationship between substituents and antiaromaticity using both synthesis and computation.
DOI: 10.1002/ajoc.202500372 (OA)
DOI: 10.1002/ajoc.202500372 (OA)
Tuning Antiaromaticity Through Meso‐Substituent Orientation in Core‐Modified Isophlorins
The antiaromaticity of dithiadioxaisophlorins is controlled by the steric bulkiness of meso-substituents through their tilt angle relative to the macrocycle. Bulkier substituents maintain larger angl....
doi.org
May 23, 2025 at 3:33 AM
When Maika synthesized thienyl-substituted isophlorins for another purpose, she noticed they showed weaker antiaromaticity than others. This sparked our investigation into the relationship between substituents and antiaromaticity using both synthesis and computation.
DOI: 10.1002/ajoc.202500372 (OA)
DOI: 10.1002/ajoc.202500372 (OA)
Starting today, my affiliation's English name changed:
Osaka University → The University of Osaka
(Japanese name remains unchanged: 大阪大学)
www.osaka-u.ac.jp/en/guide/Our...
Osaka University → The University of Osaka
(Japanese name remains unchanged: 大阪大学)
www.osaka-u.ac.jp/en/guide/Our...
Our Name and Logo
www.osaka-u.ac.jp
April 1, 2025 at 12:05 AM
Starting today, my affiliation's English name changed:
Osaka University → The University of Osaka
(Japanese name remains unchanged: 大阪大学)
www.osaka-u.ac.jp/en/guide/Our...
Osaka University → The University of Osaka
(Japanese name remains unchanged: 大阪大学)
www.osaka-u.ac.jp/en/guide/Our...
Reposted by Ken-ichi Yamashita
Effect of Chalcogen Interaction on the Structure of Methine-Bridged Trichalcogenophenes
Authors: Rio Nishimura, Ken-ichi Yamashita
DOI: 10.26434/chemrxiv-2025-2s0pv
Authors: Rio Nishimura, Ken-ichi Yamashita
DOI: 10.26434/chemrxiv-2025-2s0pv
March 17, 2025 at 10:04 AM
Effect of Chalcogen Interaction on the Structure of Methine-Bridged Trichalcogenophenes
Authors: Rio Nishimura, Ken-ichi Yamashita
DOI: 10.26434/chemrxiv-2025-2s0pv
Authors: Rio Nishimura, Ken-ichi Yamashita
DOI: 10.26434/chemrxiv-2025-2s0pv
Reposted by Ken-ichi Yamashita
Tuning Antiaromaticity through meso-Substituent Orientation in Core-Modified Isophlorins
Authors: Maika Isoda, Haruna Sugimura, Yusuke Honda, Ken-ichi Yamashita
DOI: 10.26434/chemrxiv-2025-nrvzb
Authors: Maika Isoda, Haruna Sugimura, Yusuke Honda, Ken-ichi Yamashita
DOI: 10.26434/chemrxiv-2025-nrvzb
March 12, 2025 at 12:34 PM
Tuning Antiaromaticity through meso-Substituent Orientation in Core-Modified Isophlorins
Authors: Maika Isoda, Haruna Sugimura, Yusuke Honda, Ken-ichi Yamashita
DOI: 10.26434/chemrxiv-2025-nrvzb
Authors: Maika Isoda, Haruna Sugimura, Yusuke Honda, Ken-ichi Yamashita
DOI: 10.26434/chemrxiv-2025-nrvzb
Exciting new paper on an antiaromatic β-tetracyanoisophlorin! The Sn(IV) complex exhibits enhanced antiaromaticity compared to free base. Crystal structure revealed a surprising dianionic complex with axial anions, not the expected neutral complex.
doi.org/10.1002/ajoc... (Open Access)
doi.org/10.1002/ajoc... (Open Access)
Synthesis and Characterization of an Air‐Stable Tin(IV) β‐Tetracyanoisophlorin Complex: Enhanced Antiaromaticity through Metal Complexation.
The synthesis and characterization of a novel air-stable Sn(IV) β-tetracyanoisophlorin complex is described. The complex was obtained by reducing the corresponding Sn(IV) β-tetracyanoporphyrin with h...
doi.org
January 15, 2025 at 11:24 AM
Exciting new paper on an antiaromatic β-tetracyanoisophlorin! The Sn(IV) complex exhibits enhanced antiaromaticity compared to free base. Crystal structure revealed a surprising dianionic complex with axial anions, not the expected neutral complex.
doi.org/10.1002/ajoc... (Open Access)
doi.org/10.1002/ajoc... (Open Access)
Sharing our previous work on metalloporphyrin hosts! While Zn porphyrins are conventionally chosen for axial coordination, we demonstrated successful binding with Ni and Cu porphyrins - metals typically known for their weak axial coordination ability.
doi.org/10.1002/ajoc...
doi.org/10.1002/ajoc...
Outstanding Enhancement in the Axial Coordination Ability of the Highly Rigid Cofacial Cyclic Metalloporphyrin Dimer
The unusual axial coordination on CuII and NiII ions in the cofacial cyclic porphyrin dimer was induced by its remarkably high structural rigidity without the assistance of electron-withdrawing subst...
doi.org
January 8, 2025 at 11:34 AM
Sharing our previous work on metalloporphyrin hosts! While Zn porphyrins are conventionally chosen for axial coordination, we demonstrated successful binding with Ni and Cu porphyrins - metals typically known for their weak axial coordination ability.
doi.org/10.1002/ajoc...
doi.org/10.1002/ajoc...
Surprised by the sudden follower growth - found out I'm in the Supramol Chem starter kit! Grateful and amazed to see so many supramolecular chemists here on Bluesky.
Here is a tentative Supramolecular Chemistry starter kit. Please let me know if you wish to be added ! #ChemSky
go.bsky.app/RjRgi6n
go.bsky.app/RjRgi6n
January 8, 2025 at 11:19 AM
Surprised by the sudden follower growth - found out I'm in the Supramol Chem starter kit! Grateful and amazed to see so many supramolecular chemists here on Bluesky.
We've discovered other similar cyclization reactions and look forward to reporting them soon! During mechanism studies, this was my first experience using xtb/CREST/CENSO for conformational searching. Currently using this approach extensively with results coming soon!
December 5, 2024 at 4:19 AM
We've discovered other similar cyclization reactions and look forward to reporting them soon! During mechanism studies, this was my first experience using xtb/CREST/CENSO for conformational searching. Currently using this approach extensively with results coming soon!
Hello Bluesky! Excited to share that one of my research interests is antiaromaticity. We recently published our work on the synthesis of antiaromatic triphyrin via a serendipitously discovered 16π electrocyclization.
doi.org/10.1002/chem... (Open Access)
doi.org/10.1002/chem... (Open Access)
Stable Antiaromatic [16]Triphyrin(2.1.1) with Core Modification: Synthesis Using a 16π Electrocyclic Reaction
The first stable antiaromatic trioxa[16]triphyrin(2.1.1) was synthesized and characterized using a core modification strategy. The synthesis involves a key intermediate, dihydrotrioxatriphyrin(2.1.1)...
chemistry-europe.onlinelibrary.wiley.com
December 5, 2024 at 4:16 AM
Hello Bluesky! Excited to share that one of my research interests is antiaromaticity. We recently published our work on the synthesis of antiaromatic triphyrin via a serendipitously discovered 16π electrocyclization.
doi.org/10.1002/chem... (Open Access)
doi.org/10.1002/chem... (Open Access)