A5031316602- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Molecular Sensors and Ion Detection
- Supramolecular Chemistry and Complexes
- Lanthanide and Transition Metal Complexes
- Luminescence and Fluorescent Materials
- Crystallography and molecular interactions
- Magnetism in coordination complexes
- Porphyrin and Phthalocyanine Chemistry
- Metal complexes synthesis and properties
- Surface Chemistry and Catalysis
- Phytochemical Studies and Bioactivities
- Electromagnetic Simulation and Numerical Methods
- Radioactive element chemistry and processing
- Synthesis and Catalytic Reactions
- Advanced NMR Techniques and Applications
- Synthesis and Biological Evaluation
- Metal-Organic Frameworks: Synthesis and Applications
- Traditional Chinese Medicine Analysis
- Crystal structures of chemical compounds
- Photochemistry and Electron Transfer Studies
- Ionic liquids properties and applications
- Induction Heating and Inverter Technology
- Synthetic Organic Chemistry Methods
- Mass Spectrometry Techniques and Applications
Ritsumeikan University
2025
Toho University
2021-2023
Tokai University
2011
Two pentamethine dyes with nearly identical structures but slightly different dipole moments were prepared as ion pairs. The pairs provided charge-segregated assemblies stabilized by dipole-dipole interactions between the positively charged π-electronic systems. stacking structure of bromo-substituted cation was more a larger moment, suggested energy decomposition analysis. Depending on packing arrangements, highly electric conductive properties observed owing to structures, also correlated...
In this study, anion‐responsive π‐conjugated macrocycles were synthesized to demonstrate anion‐binding and ion‐pairing properties along with the ordered structures. Ion‐pairing charge‐by‐charge assembly of a [1+2]‐type complex macrocycle as pseudo π‐electronic anion countercation was revealed by single‐crystal X‐ray analysis. Further, two‐dimensional (2D) arrays bearing alkoxy chains, exhibiting anion‐driven disordered structures, constructed on highly oriented pyrolytic graphite (HOPG)...
Three new norlanostane-type triterpene glycosides, scillanostasides A, B, and C, two lanostane-type D E, were isolated from the bulbs of Scilla scilloides Druce (Liliaceae) along with one known heptaglycoside, scillascilloside G-1. Their chemical structures determined on basis spectroscopic data as well evidence.
The synthesis of argentivorous molecules (L1 and L2) having two chromophores (4-(anthracen-9-yl)benzyl or 4-(pyren-1-yl)benzyl groups) benzyl groups the fluorescence properties their silver complexes in a solution solid state are reported. A crystallographic approach for Ag+ with L1 L2 revealed that observed changes stem from excimer formation extinction fluorescent. Furthermore, binding stabilities toward ions were estimated by Ag+-induced UV–vis PL spectral changes.
Argentivorous molecules with mono, di, tri, tetra, and penta-oxyethylene chains in aromatic side-arms were prepared (L1–L5). Titration experiments using proton nuclear magnetic resonance cold electrospray ionization (cold-spray ionization, CSI) mass spectrometry showed that silver ions trapped the cyclen moiety arranged oxyethylene of when two equivalents added. The complexes formed by adding one equivalent ion to L2–L5 bind alkali metal chains; ion-induced CSI spectral changes measured...
Bis-argentivorous molecules (La and Lb), which have phenyl 4,4'-biphenyl groups as linkers, been prepared. The structures of Ag+ complexes with the new ligands Lb) were investigated in solution solid state. CSI-MS 1H NMR titration La Lb show 1:1 1:2 depending on [Ag+]:[L] ratios. In solid-state structures, single crystals 2 equiv X-ray crystallography silver(I) showed that an intramolecular racemic structure (Δ(δδδδ)Λ(λλλλ) form) a mixture Δ(δδδδ)Δ(δδδδ) Λ(λλλλ)Λ(λλλλ) forms formed,...
The synthesis of an octa-armed 24-membered cyclic octaamine (1) is reported. When 4-benzyl-1,4,7,10-tetraazacyclododecane-2,6-dione (3a) was prepared by the reaction diethylenetriamine with diethyl N-benzyliminodiacetate (2), a dimeric macrocycle (3b) obtained as byproduct in 5% yield. An (1), named Cosmosen, via reductive amination and reduction 3b. binding constants for 1:1 2:1 (Ag+/1) complexation 1 were estimated to be ca. 7.9 13.9, respectively, titration experiments using UV–vis...
A tetra-armed cyclen ( L ) with phenylethynylmethyl groups as side-arms forms ·CH 3 CN inclusion crystals from acetonitrile–organic mixed solvents high selectivity.
A 14-membered cyclic compound (3) containing amide, amino, and carbamate groups, which was serendipitously obtained in the oily residue after separation of 4-benzyl-1,4,7,10-tetraazacyldododecane-2,6-dione (2a) 4,16-dibenzyl-1,4,7,10,13,16,19,22-octaazacyclo-tetracosane-2,6,14,18-tetraone (2b), is reported. The structure 3 formally a CO2 insertion between positions 4 12-membered ring 2a. confirmed synthesis diethyl 2,2'-(benzylazanediyl)diacetate (1) by reaction benzylamine with ethyl...
Four types of bis- and tris(tetra-armed cyclen)s were prepared. 2MF is a bis(tetra-armed cyclen) with electron-rich side arms (three 4-methoxybenzyl groups) electron-deficient 3,5-difluorobenzyl groups), connected by 4,4'-dimethyl-1,1'-biphenyl moiety. 3MFM groups introduced on both ends the central cyclen, respectively. 4MFM V-shaped analogue 3MFM. 3FMF where aromatic at cyclen are exchanged. The regioselective coordination silver(I) ions these ligands reported. Initially, we added Ag+ to...
A flexible cylindrical cryptand (1b) with two m-phenylene-26-crown-8 ethers has been prepared, and its complexing properties respect to tetravalent cationic bis-paraquat guests have investigated. Diffusion-ordered spectroscopy nuclear magnetic resonance (NMR) titration experiments using cold electrospray ionization mass spectrometry 1H NMR revealed that 1b versatile used despite the guest molecules' length shape.
We have prepared new argentivorous molecules (L2 and L3) having different linker lengths between cyclen anthracene units. The structures of Ag+ complexes with the ligands were investigated in solution solid states. silver(I) ion-induced 1H NMR UV-vis spectral changes L2 L3 showed presence 1 : complexes. solid-state are stable because four aromatic side-arms wrap incorporated unit. A photo-induced electron transfer (PET) effect that depends on length connecting nitrogen atoms to chromophore...