Preparation and properties of aminoxyl radicals having an aromatic core with long alkyl substituents

Amano, Takamitsu; Fujino, Masahiro; Akutsu, Hiroki; Yamada, Jun−ichi; Nakatsuji, Shin’ichi

doi:10.1016/j.poly.2005.03.149

Cited by 7 publications

(1 citation statement)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More recently, trans ‐azobenzene derivatives carrying a nitroxide radical with some spacer units ([II] in Fig. 9a–d) were prepared and all of them showed the photo‐isomerization by irradiation in solution to the corresponding cis ‐isomers, which could be isolated as relatively stable solid substances when kept in the dark and stored in a refrigerator and reverted back to the starting trans ‐isomers when exposed to a diffused light or a fluorescent lamp for several hours (68–70).…”

Section: Dual Nitroxide Probes For Photoswitching Magnetic Materialsmentioning

confidence: 99%

Dual Chromophore‐Nitroxides: Novel Molecular Probes, Photochemical and Photophysical Models and Magnetic Materials

Likhtenstein

Ishii

Nakatsuji

2007

Photochem & Photobiology

Self Cite

104

View full text Add to dashboard Cite

Over the last decades scientists have faced growing requirements in novel methods of fast and sensitive analysis of antioxidant status of biological systems, spin redox probing and spin trapping, investigation of molecular dynamics, and of convenient models for studies of photophysical and photochemical processes. In approaching this problem, methods based upon the use of dual chromophore-nitroxide (CN) compounds have been suggested and developed. A CN consists of two molecular sub-functionality (a chromophore and a stable nitroxide radical) tethered together by spacers. In the dual compound the nitroxide is a strong intramolecular quencher of the fluorescence from the chromophore fragment. Reduction to hydroxylamine, oxidation of the nitroxide fragment or addition of an active radical yield the fluorescence increase and the parallel decay of the fragment electron spin resonance (ESR) signal. At certain conditions the dual molecules undergo photomagnetic switching and form excited state multi-spin systems. These unique properties of CN were intensively exploited as the basis for several methodologies, which include molecular probing, modeling intramolecular photochemical and photophysical processes, and construction of new magnetic materials.

show abstract

Section: Dual Nitroxide Probes For Photoswitching Magnetic Materialsmentioning

confidence: 99%

Dual Chromophore‐Nitroxides: Novel Molecular Probes, Photochemical and Photophysical Models and Magnetic Materials

Likhtenstein

Ishii

Nakatsuji

2007

Photochem & Photobiology

Self Cite

104

View full text Add to dashboard Cite

show abstract

Organic biradical compounds with a mesogenic core and long alkoxy groups: preparation, structures and magnetic properties

Nakatsuji

Amano

Akutsu

et al. 2006

J of Physical Organic Chem

Self Cite

View full text Add to dashboard Cite

Series of organic biradical compounds 3a-3h consisting of a mesogenic core (biphenyl, naphthalene, azobenzene and azoxybenzene) and long alkoxy groups with PROXYL or TEMPO radicals were prepared. The TEMPO derivatives (3b, 3d, 3f, and 3h) were found to show fairly large antiferromagnetic interactions (J ¼ À34 $ À45 K) being well expressed by singlet-triplet model irrespective of the mesogenic cores and the behavior is understandable by taking a hand-in-hand like assembled structure into consideration. On the other hand, only weak antiferromagnetic interactions with Curie-Weiss behavior were observed in all of the PROXYL derivatives (3a, 3c, 3e, and 3d) affording a sharp contrast with the TEMPO-based biradicals.

show abstract

Preparation and characterization of magnetic and magnetophotonic materials based on organic free radicals

Tretyakov

2024

Organic Radicals

View full text Add to dashboard Cite

Preparation and properties of aminoxyl radicals having an aromatic core with long alkyl substituents

Cited by 7 publications

References 11 publications

Dual Chromophore‐Nitroxides: Novel Molecular Probes, Photochemical and Photophysical Models and Magnetic Materials

Dual Chromophore‐Nitroxides: Novel Molecular Probes, Photochemical and Photophysical Models and Magnetic Materials

Organic biradical compounds with a mesogenic core and long alkoxy groups: preparation, structures and magnetic properties

Preparation and characterization of magnetic and magnetophotonic materials based on organic free radicals

Contact Info

Product

Resources

About