Article
Chemistry, Multidisciplinary
Bamlaku Semagne Aweke, Cheng-Han Yu, Minna Zhi, Wen-Ching Chen, Glenn P. A. Yap, Lili Zhao, Tiow-Gan Ong
Summary: Divalent carbon(0) species, carbones, with two lone pairs of electrons have been prepared in this study. The first known stable and isolable free bis-(carbone) pincer framework was synthesized, which serves as an effective scaffold for forming monometallic and trinuclear heterometallic complexes. Quantum-theoretical analyses showed that the stability of these complexes is mainly attributed to the four lone pairs of electrons within the bis-(carbone) framework, rather than metal-metal interactions.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Jiwei Wang, Congyun Xie, Xiang Cheng, Ye Liu, Jun Zhang
Summary: Coinage metal-promoted 5-exo and 6-endo selective cyclization of 2-(1-alkynyl)benzaldimines has been studied. Under gold catalysis, 2-(1-alkynyl)benzaldimines exclusively underwent 5-exo-dig cyclization, while in the presence of base and under activation of AgOTf, switching to 6-endo cyclization was observed. The reaction intermediates, exocyclic vinyl-Au and endocyclic vinyl-Ag species, were isolated and characterized, confirming plausible mechanisms. The resultant products, including isoindolinone-based benzocyclobutenes and isoquinolinium salts, have important structural significance and exhibit interesting transformations.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Multidisciplinary Sciences
Xuyang Wang, Binglin Lei, Zhaoyin Zhang, Ming Chen, Hua Rong, Haibin Song, Lili Zhao, Zhenbo Mo
Summary: In this study, a series of antimony(I) and bismuth(I) cations supported by a bis(silylene) ligand were synthesized and characterized. These compounds exhibited bis-coordinated antimony and bismuth atoms with two lone pairs of electrons. They can undergo reactions with methyl trifluoromethane sulfonate to form dicationic antimony(III) and bismuth(III) methyl complexes. Additionally, compounds 2 and 3 can act as 2e donors to group 6 metals, resulting in the formation of ionic antimony and bismuth metal carbonyl complexes.
NATURE COMMUNICATIONS
(2023)
Article
Electrochemistry
Heather Hamilton, Charles L. Hussey
Summary: Cyclic staircase voltammetry, rotating disk electrode voltammetry, controlled potential coulometry, and electrochemical impedance spectroscopy were used to investigate the electrochemistry and mass transport of Yb3+ in six ionic liquids. The rate of heterogeneous electron transfer of the Yb3+/2+ redox couple was dependent on the electrode materials, but independent of the physicochemical properties of the ionic liquids. The mass transport of Yb3+ was found to be dependent on the viscosity of the ionic liquids.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Dolly Chandel, Bapan Saha, Sk Asif Ikbal, Sankar Prasad Rath
Summary: This study reports the linear exo-endo polymeric chain structures of Zn2DEP with longer bidentate substrates, and demonstrates the role of substrate size and nature in controlling the design of axially coordinated complexes. Zn2DEP has been shown to act as an efficient tweezer host for binding different guests inside its cavity, forming discrete monomeric, sandwich, and polymeric complexes based on the size and type of axial guests. This work can contribute to the rational design of receptors for molecular recognition and chirality sensing devices.
JOURNAL OF PORPHYRINS AND PHTHALOCYANINES
(2021)
Article
Chemistry, Inorganic & Nuclear
Huiyeong Ju, In-Hyeok Park, Eunji Lee, Chungsik Kim, Seulgi Kim, Shunsuke Kuwahara, Yoichi Habata, Shim Sung Lee
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2020)
Article
Chemistry, Multidisciplinary
Huiyeong Ju, Yumiko Tsuruoka, Miho Hayano, Eunji Lee, Ki-Min Park, Mari Ikeda, Jun-ichi Ishi-i, Shunsuke Kuwahara, Yoichi Habata
Summary: The tetra-armed cyclen compound bearing specific groups was prepared and characterized along with its Ag+ complexes. These complexes were found to undergo reversible structural transformations between different ratios of Ag+ / 1, and could selectively encapsulate benzene and [D6]benzene in the solid-state. The stability of the benzene-included structures was attributed to C-H···F-C interactions between the benzene molecule and the ligand molecule.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Inorganic & Nuclear
Huiyeong Ju, Tomoko Abe, Yukari Takahashi, Yumiko Tsuruoka, Akihiro Otsuka, Eunji Lee, Mari Ikeda, Shunsuke Kuwahara, Yoichi Habata
Summary: A tetra-armed cyclen compound (L) was synthesized with various substituents, leading to the formation of a 2:2 cyclic dimer and a 3:6 cyclic trimer upon reaction with silver(I). The reversible complexation between these two structures was confirmed by H-1 NMR and CSI mass analysis.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Huiyeong Ju, Aya Taniguchi, Kaoru Kikukawa, Hiroki Horita, Mari Ikeda, Shunsuke Kuwahara, Yoichi Habata
Summary: The study synthesized two argentivorous molecules with different chromophores and benzyl groups to investigate their fluorescence properties and binding stabilities with Ag+ ions. The crystallographic approach revealed that the fluorescence changes were primarily due to excimer formation and fluorescence quenching. Ag+-induced UV-vis and PL spectral changes were used to estimate the binding stabilities of the molecules with Ag+ ions.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Huiyeong Ju, Megumi Uchiyama, Hiroki Horita, Mari Ikeda, Shunsuke Kuwahara, Yoichi Habata
Summary: Argentivorous molecules with aromatic side-arms containing mono, di, tri, tetra, and penta-oxyethylene chains were prepared and their binding properties and selectivity for silver and alkali metal ions were investigated. The results showed that the conformational change of the aromatic side-arms in L2-L5 led to enhanced binding ability and selectivity due to the arrangement of oxyethylene chains.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Organic
Huiyeong Ju, Miki Iwase, Hikari Sako, Hiroki Horita, Shiori Koike, Eunji Lee, Mari Ikeda, Shunsuke Kuwahara, Yoichi Habata
Summary: The synthesis of an octa-armed 24-membered cyclic octaamine was reported, with a dimeric macrocycle obtained as a byproduct. The compound named Cosmosen was prepared via reductive amination and reduction. Binding constants for the complexation of 1 with Ag+ were estimated using UV-vis spectrometry.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Huiyeong Ju, Hiroki Horita, Miki Iwase, Nanae Kaneko, Ken-ichi Yagi, Mari Ikeda, Shunsuke Kuwahara, Yoichi Habata
Summary: Bis-argentivorous molecules containing phenyl and 4,4'-biphenyl groups as linkers were prepared to form complexes with Ag+ in different ratios. X-ray crystallography revealed the formation of intramolecular racemic structures in the silver(I) complexes. Dynamic H-1 NMR studies indicated restricted rotation of the side arms due to their shortness.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Organic
Yoichi Habata, Yuka Matsumoto, Hiroki Horita, Mari Ikeda, Shunsuke Kuwahara
Summary: A flexible cylindrical cryptand (1b) with two m-phenylene-26-crown-8 ethers has been found to have versatile complexing properties with respect to tetravalent cationic guests despite their differences in length and shape, according to diffusion-ordered spectroscopy nuclear magnetic resonance (NMR) and titration experiments.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Organic
Hiroki Horita, Izumi Sato, Huiyeong Ju, Eunji Lee, Mari Ikeda, Shunsuke Kuwahara, Yoichi Habata
Summary: A 14-membered cyclic compound (3) containing amide, amino, and carbamate groups was obtained by serendipity in the oily residue after the separation of two different compounds (2a and 2b). The structure of compound 3 was found to involve a CO2 insertion between positions 3 and 4 of compound 2a. The selectivity and kinetic behavior of compound 3 and another compound (5) were also reported.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Hiroki Horita, Fumika Nemoto, Izumi Sato, Mari Ikeda, Shunsuke Kuwahara, Yoichi Habata
Summary: The ligands of tris(tetra-armed cyclen) and pentakis(tetra-armed cyclen) were synthesized and their structures were confirmed by various analytical techniques. Upon addition of Ag+ ions, the ligands formed complexes with stoichiometries of 1:1 to 1:3 and 1:1 to 1:5 for the tris and pentakis ligands, respectively. The association constants between the ligands and Ag+ ions were estimated using UV-vis spectroscopy.
JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Hiroki Horita, Ki-Min Park, Mari Ikeda, Shunsuke Kuwahara, Yoichi Habata
Summary: Bis- and tris(tetra-armed cyclen)s with electron-rich or electron-deficient aromatic side arms were synthesized for regioselective coordination with Ag+ ions. The coordination behavior was determined by the electron density variation in the aromatic side arms. Different complexes were formed depending on the substituents and locations of the cyclen units. The results demonstrated the possibility of achieving regioselective coordination with Ag+ ions by tuning the electron density on the aromatic side arms in bis- or tris(tetra-armed cyclen)s.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Yoichi Habata, Ayumi Wada, Eunji Lee, Huieyong Ju, Yuki Yoshiba, Hiroki Horita, Jun-ichi Ishii, Mari Ikeda, Shunsuke Kuwahara
Summary: In this study, we describe the formation of tetra-armed cyclen (L) inclusion crystals, capable of selectively binding acetonitrile, from acetonitrile-organic mixed solvents. We observed that L acts as an acetonitrile selective molecular sponge.
Article
Chemistry, Inorganic & Nuclear
Huiyeong Ju, Takao Hiraoka, Hiroki Horita, Eunji Lee, Mari Ikeda, Shunsuke Kuwahara, Yoichi Habata
Summary: In this study, new argentivorous molecules with different linker lengths were synthesized and their complexes with Ag+ were investigated. The experiments showed that stable 1:1 complexes were formed between the new ligands and Ag+, and the strength of the photoinduced electron transfer effect had a linear correlation with the linker length.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
Chihiro Kachi-Terajima, Miku Okubo, Mari Ikeda, Yoichi Habata
Summary: In this study, a reversible covalent bond was utilized to achieve luminescence switching in a Tb(iii) complex, where the exchange between the antenna and quencher moieties attached to the ligand was driven by acid/base reactions. This resulted in the on-off regulation of luminescence through the formation of a hemiaminal ether structure.
CHEMICAL COMMUNICATIONS
(2021)