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Oishi, Tomoji*; Kimura, Yu*; Nakajima, Kiyohiko*; Watanabe, Masayuki; Aoyagi, Noboru
Materials Sciences and Applications, 11(3), p.195 - 203, 2020/03
A high-efficiency synthesis method for a latent pigment of red pigment diketo-pyrrolo-pyrrole (Pig. Red 272:272DPP), which is important as a functional organic pigment, was investigated, and the investigation results revealed that irradiation of microwaves (MWs) for several seconds to 272 DPP in NMP (N-methyl-2-pyrrolidone) solvent yielded DPP latent pigment (272DPP-BOC) at a high yield of 86.2%. Two kinds of latent-pigment crystals, namely, red and yellow, were obtained by recrystallization, and it was found that the fluorescence-emission properties of the two kinds differ significantly. Single-crystal X-ray structural analysis showed that the difference in the fluorescence-emission properties of the two types is derived from the difference in their crystal structures.
Ebato, Shota*; Watanabe, Masayuki; Nakajima, Kiyohiko*; Tsuchimoto, Masanobu*
Chemistry Letters, 39(7), p.706 - 707, 2010/05
Times Cited Count：6 Percentile：27.15(Chemistry, Multidisciplinary)A europium(III) complex with tetradentate Schiff base ligands (C
H
)
NH[Eu(3,5Clsalen)] was prepared, and its structure was determined by X-ray crystal structure analysis. The complex has an eight-coordinate mononuclear structure with two Schiff base ligands in a 
form. The complex displays emission bands resulting from ff transitions by excitation at 357 or 234 nm in acetonitrile.
Ebato, Shota*; Tsuchimoto, Masanobu*; Watanabe, Masayuki; Nakajima, Kiyohiko*
no journal, ,
Eu complexes of tetradentate Schiff-base ligand(L) have a octa-coordinated structure which ligand perpendicularly coordinated to the Eu center. It has been found that the counter cation, triethylammonium, formed hydrogen bonding with the complex with L. In this presentation, we investigated the Eu complex with L with tetraethylammonium as a counter cation which could not form hydrogen bonding with the complex.
Toyoda, Saori*; Tsuchimoto, Masanobu*; Watanabe, Masayuki; Nakajima, Kiyohiko*
no journal, ,
Europium(III) complexes with tetradentate Schiff base ligands derived from chiral stilbenediamine, (Et)4N[Eu(L)2] (H2L: Schiff base ligands) were prepared, and the luminescence properties of the crystals were investigated.
Suzuki, Kaori*; Tsuchimoto, Masanobu*; Aoyagi, Noboru; Watanabe, Masayuki; Nakajima, Kiyohiko*
no journal, ,
Mononuclear Y(III), La(III), Gd(III) complexes ((CH)
N[Ln(L)]) with tetradentate Schiff base ligands derived from chiral stilbenediamine were synthesized. The luminescence of these complexes exhibited different in luminescence color between the chiral complexes and the racemic complexes. In this presentation, luminescence properties on the crystalline powder of mononuclear Y(III), La(III), Gd(III) complexes were investigated in detail. It was found out that the different luminescence spectra of crystalline were observed in between chiral and racemic complexes, but the similar luminescence spectra were observed in the ground ones.
Okusa, Masako*; Tsuchimoto, Masanobu*; Watanabe, Masayuki; Nakajima, Kiyohiko*
no journal, ,
Mononuclear Eu(III) complexes with tetradentate schiff base ligands (CH)NH[Eu(L)] (L:3,5Clsalen) exhibits strong red luminescence under ultraviolet light at 360 nm. The derivatives of this complex varies its luminescence in the solid state by the structural change of the ligand or counter cation. In this presentation, luminescence properties of mononuclear europium(III) complex with tetradentate Schiff base ligands and different counter cations such as X=(CH)NH 
, (CH)N in solutions were investigated.
Miyagai, Natsuki*; Tsuchimoto, Masanobu*; Watanabe, Masayuki; Nakajima, Kiyohiko*
no journal, ,
no abstracts in English
Miyagai, Natsuki*; Tsuchimoto, Masanobu*; Watanabe, Masayuki; Nakajima, Kiyohiko*
no journal, ,
Mono-nuclear Eu(III) complexes coordinated by two tetradentate salen type Schiff bases allowed to constitute a meridional eight-coordination structure and demonstrate red luminescence based on a f-f transition by means of ultra-violet irradiation. In this study, ternary and quaternary ammonium cations (XNH or XN) were used for synthesis of mono-nuclear complexes and their luminescence properties were investigated. Especially, the changes of the luminescence intensity with regard to the grind samples were also studied in detail.
