Kenji Matsuda

A diarylethene having two nitronyl nitroxides, 1,2-bis[6-(1-oxyl-3-oxide-4,4,5,5-tetramethylimidazolin-2-yl)-2-methyl-1-benzothiophen-3-yl]hexafluorocyclopentene (2a), was synthesized in an attempt to control the intramolecular magnetic interaction by photoirradiation. The photochemical conversions from open-ring isomer 2a to closed-ring isomer 2b and from 2b to 2a were both almost 100%. Magnetic measurement revealed the antiferromagnetic interaction between two nitronyl nitroxides remarkably in

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPhotoswitching of Intramolecular Magnetic Interaction Using a Diarylethene DimerKenji Matsuda and Masahiro IrieView Author Information Department of Chemistry and Biochemistry Graduate School of Engineering, Kyushu University CREST, Japan Science and Technology Corporation 6-10-1 Hakozaki, Higashi-ku, Fukuoka, 812-8581 Japan Cite this: J. Am. Chem. Soc. 2001, 123, 40, 9896–9897Publication Date (Web):September 15, 2001Publication History Received2

Photochromic diarylethenes that have p-phenylene-substituted benzothiophene aryl groups with and without nitronyl nitroxide radicals at both ends of the molecules were synthesized. The absorption maxima of the closed-ring isomers showed a hypsochromic shift with the increase in the pi-conjugated chain length. The unique behavior was attributed to the stabilization by the resonant quinoid structures. Both photocyclization and photocycloreversion quantum yields of the diarylethene with nitronyl ni

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign, Synthesis, and Characterization of Three Kinds of .pi.-Cross-Conjugated Hexacarbenes with High-Spin (S = 6) Ground StatesKenji Matsuda, Nobuo Nakamura, Kazuyuki Takahashi, Katsuya Inoue, Noboru Koga, and Hiizu IwamuraCite this: J. Am. Chem. Soc. 1995, 117, 20, 5550–5560Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published inissue 1 May 1995https://pubs.acs.org/doi/10.1021/ja00125a017https://doi.org/10.1021/

The relationship between molecular conductance and molecular structure is an important issue in molecular electronics. Photochromic molecules can interconvert their molecular structures by light, so that the molecular conductance should be photocontrolled. According to this strategy the networks composed of photochromic diarylethene dithiols and gold nanoparticles were prepared, and the photochemical reactivity and photoswitching of the conductance were studied. The networks showed a completely

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPhotoswitching of Intramolecular Magnetic Interaction Using a Photochromic Spin Coupler: An ESR StudyKenji Matsuda and Masahiro IrieView Author Information Department of Chemistry and Biochemistry Graduate School of Engineering, Kyushu University CREST, Japan Science and Technology Corporation 6-10-1 Hakozaki, Higashi-ku, Fukuoka, 812-8581 Japan Cite this: J. Am. Chem. Soc. 2000, 122, 34, 8309–8310Publication Date (Web):August 11, 2000Publication

A network composed of gold nanoparticles covered with diarylethene dithiophenols was prepared on an interdigitated nanogapped gold electrode to show the reversible photoswitching of the conductance due to the photochromism of the diarylethene molecules induced by UV and visible light.

Diarylethenes having two nitronyl nitroxide radicals at both ends of the molecule with oligothiophene spacers were synthesized. The diradicals underwent photochromic reactions upon alternate irradiation with UV and visible light. ESR spectra of the diradicals reversibly changed with the photochromism. The magnetic interaction between spins through oligothiophene spacers was stronger than that through oligophenylene spacers, and the photochromic reactivity of the diradical diarylethenes with olig

Abstract Photochromic compounds are currently recognized as the promising candidates for future optoelectronic devices, such as memories and switches. Photochemical pericyclic reactions between 1,3,5-hexatriene and 1,3-cyclohexadiene have been used in several ways to construct versatile photochromic compounds. Recent development of the 6π-electrocyclic photochromic systems is overviewed.

To investigate the helical conformation of oligo(m-phenylene ethynylene)s, a pair of TEMPO spin labels were appended to the backbone. The two TEMPO radicals were separated by the four, five, and six repeating units. ESR spectra of the labeled oligomers were measured in chloroform and in ethyl acetate solvents in which the oligomers are disordered and folded, respectively. The measurement and analysis of ESR spectra revealed that six repeating units make one helical turn.

Metal complexes composed of bidentate 1,2-bis(2-methyl-5-(4-pyridyl)-3-thienyl)perfluorocyclopentene (1a) and monodentate 1-(2-methyl-5-phenyl-3-thienyl)-2-(2-methyl-5-(4-pyridyl)-3-thienyl)perfluorocyclopentene (2a) photochromic ligands and M(hfac)(2) (M = Zn(II), Mn(II), and Cu(II)) were prepared, and their photoinduced coordination structural changes were studied. X-ray crystallographic analyses showed the formation of coordination polymers and discrete 1:2 complexes for bidentate and monoden

A linear coordination polymer composed of diarylethene and bis(hexafluoroacetylacetonato)zinc(II) has been synthesized and its photochromism in the single-crystalline phase studied by polarized absorption spectroscopy.

Photochromic molecules exhibit photoresponsive variations in their physical properties.

Bis(3-thienyl)- and bis(2-thienyl)ethenes having nitronyl nitroxide radicals at both ends of the molecules were synthesized. Bis(3-thienyl)ethene diradicals underwent a reversible photochromic reaction by irradiation with UV and visible light. Photoswitching of intramolecular magnetic interaction was proved by EPR spectroscopy. By choosing an appropriate spacer, the intramolecular exchange interaction in the closed-ring isomer was detected to be more than 150 times larger than that in the open-r