Yuya Ogawa

Preparation and Properties of Photo-Functional Systems with Nitroxide Radicals

Abstract Series of TEMPO-substituted norbornadiene, spiropyran and anthracene derivatives have been prepared; their light-induced structural change to the corresponding qudricyclanes, merocyanines or anthracene-dimers and the reverse reactions to the starting materials have been studied. The antiferromagnetic or ferromagnetic behavior observed in norbornadienes/anthracenes was found to be preserved in the corresponding quadricyclanes/anthracene-dimers in spite of the difference of their Weiss temperatures, whereas switching of the intermolecular magnetic interactions was observed in spiropyran/merocyanine systems.

Preparation and Properties of Some Photo-Responsive Compounds with TEMPO Radical

Abstract A couple of spin systems with photo-responsive property have been developed, i. e., norbor-nadiene and spiropyran derivatives carrying TEMPO-substituent and their light-induced structural changes to the corresponding quadricyclane or merocyanine derivatives have been investigated together with the changes of their properties in solution as well as in the solid state.

Novel photo-responsive organic spin systems: preparation and properties of norbornadienes and spiropyrans with TEMPO radical substituents

Several photo-responsive norbornadiene as well as spiropyran derivatives with TEMPO radical substituents were prepared and their light-induced structural changes to the corresponding quadricyclanes or merocyanine dyes and reverse reactions to the starting materials were investigated. While the intermolecular magnetic interactions tend to be preserved in norbornadiene–quadricyclane systems in spite of the differences of their Weiss temperatures, a switching of the intermolecular magnetic interactions was observed in the spiropyran–merocyanine systems.

Structures and Properties of Organic Photo-Responsive Spin Systems

Organic salts derived from the styrylpyrilium systems as well as anthracene derivatives with TEMPO substituents were prepared and their structures and properties, especially magnetic properties were investigated. Among them, remarkable change of their magnetic properties in the solid-state was found in the styrylpyrilium system with p -methoxy-substituent by changing the counter radical anions or by photo-dimerization.

Convenient synthetic method of functional phosphines under photochemical conditions

GRAPHICAL ABSTRACT ABSTRACT Steady-state photolysis of triarylphosphines, Ar3P, under an argon atmosphere in a solvent with the structure CH3X (X = CN, COOC2H5, COCH3) afforded an adduct with the solvent molecule, Ar2PCH2X, in significant amount. This photoreaction is acknowledged as a convenient method to prepare functional phosphines.