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3 article(s) from Hasegawa, Masashi

Design and synthesis of an axially chiral platinum(II) complex and its CPL properties in PMMA matrix

Daiki Tauchi,
Sota Ogura,
Misa Sakura,
Kazunori Tsubaki and
Masashi Hasegawa

Beilstein J. Org. Chem. 2026, 22, 143–150, doi:10.3762/bjoc.22.7

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Figure 1: Molecular design for axially chiral platinum(II) complex S/R-Pt based on a pincer ligand.

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Scheme 1: Synthesis of the binaphthyl-based ligand and the platinum(II) complex. Yields indicated correspond ...

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Figure 2: (a) UV–vis and PL spectra (λ_ex = 300 nm) in 1.0 × 10⁻⁵ M dichloromethane solution, the gray dotted ...

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Figure 3: Emission spectrum of 1 wt % PMMA matrix (R-Pt) (λ_ex = 300 nm).

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Figure 4: (a) CD spectra of S/R-Pt in 1.0 × 10⁻⁵ M dichloromethane solution. (b) CPL spectra of 1 wt % PMMA f...

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Full Research Paper

Published 15 Jan 2026

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Star-shaped tetrathiafulvalene oligomers towards the construction of conducting supramolecular assembly

Masahiko Iyoda and
Masashi Hasegawa

Beilstein J. Org. Chem. 2015, 11, 1596–1613, doi:10.3762/bjoc.11.175

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Figure 1: Radially expanded TTF oligomers 1 and 2a,b.

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Figure 2: TTF-calix[4]pyrrole 3 and its TNT and C₆₀ complexes 4 and 5.

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Figure 3: C₃-symmetric TTF derivatives 6a,b and 7a–c.

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Figure 4: Radially expanded TTF derivatives 8, 9, and 10a,b.

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Figure 5: Amphiphilic TTFs 11–14 and 15a,b.

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Figure 6: TTF dimers linked by σ-bond (16) and conjugated π-systems (17–19).

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Scheme 1: Synthesis of star-shaped TTF trimers 22 and 23.

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Figure 7: Projections of the molecular array of 22 in crystal structure (a) along with the c axis and (b) fro...

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Figure 8: UV–vis/NIR spectra of 23, 23^•+, 23³⁺, and 23⁶⁺.

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Scheme 2: Synthesis of tris(TTF)[12]annulenes 28 and 29 and tris(TTF)[18]annulenes 30 and 31, together with h...

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Figure 9: TTF-fused annulene 33 and radiannulenes 34 and 35.

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Figure 10: Colors of 30 solutions a–d in toluene (0.025 mM) at various temperatures. (a) λ_max: 511 nm, (b) λ_max...

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Figure 11: Solutions of 33. (a) In CS₂, λ_max: 608 nm. (b) In CH₂Cl₂, λ_max: 577 nm. Reprinted with permission f...

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Figure 12: Optical micrographs (1000× magnified) of fibers, prepared from 30 in THF–H₂O 1:1, on a glass plate ...

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Scheme 3: Star-shaped TTF oligomers 38–43.

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Figure 13: Star-shaped TTF 10-mer 44.

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Figure 14: Cyclic voltammograms of 38, 40, and 42 (0.1 mM) in benzonitrile with 0.1 M n-Bu₄PF₆ as a supporting...

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Figure 15: Stepwise oxidation of (a) 38 (0.02 mM), (b) 40 (0.05 mM), and (c) 42 (0.03 mM) with incremental add...

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Scheme 4: Pyridazine-3,6-diol-TTF 45 and its trimer 46.

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Figure 16: CT-complex of 47 with TCNQF₄.

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Figure 17: (a) Star-shaped TTF hexamer 48. (b) Optical image of 48 fiber with a hexagonal structure. (c) Optic...

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Review

Published 10 Sep 2015

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Chiroptical properties of 1,3-diphenylallene-anchored tetrathiafulvalene and its polymer synthesis

Masashi Hasegawa,
Junta Endo,
Seiya Iwata,
Toshiaki Shimasaki and
Yasuhiro Mazaki

Beilstein J. Org. Chem. 2015, 11, 972–979, doi:10.3762/bjoc.11.109

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Figure 1: TTF-substituted allenes 1–3.

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Scheme 1: Synthesis of 3.

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Figure 2: (a) ECD spectra of (R)-(−)-3 (3.5 × 10⁻⁵ M), (S)-(+)-3 (3.8 × 10⁻⁵ M), (R)-(−)-9 (3.0 × 10⁻⁵ M), an...

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Scheme 2: Synthesis of chiral (R)-PTDPA and (S)-PTDPA.

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Figure 3: (a) UV–vis absorption spectra of 3 and PTDTA in CH₂Cl₂. (b) Normalized ECD spectra of (R)-PTDPA, (S...

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Figure 4: CV of 3 (7.8 × 10⁻⁴ M) and PTDPA in PhCN.

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Figure 5: Electronic spectra of (a) 3 and its cationic species, and (b) PTDPA and its cationic states of PTDP...

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Published 08 Jun 2015

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