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A new stable spiropyranic aminyloxide (nitroxide)
Author(s) -
Balaban Alexandru T.,
Negoita Nicolae,
Baican Roman
Publication year - 1977
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270090913
Subject(s) - spiropyran , nitroxide mediated radical polymerization , solid state , salt (chemistry) , chemistry , spectral line , medicinal chemistry , polymer chemistry , crystallography , photochemistry , physics , organic chemistry , photochromism , polymer , radical polymerization , copolymer , astronomy
The N ‐hydroxy‐spiropyran 1‐hydroxy‐3‐oxoindoline‐2‐spiro‐4′‐[2′,6′‐diphenyl‐4′ H ‐pyran], prepared according to Van Allan et al. starting from a 4‐methyl substituted pyrylium salt, can be readily oxidized to the corresponding aminyloxide. This can be obtained in the crystalline state and may be kept as such for years without modification. The e.s.r. spectra were investigated in the solid and in solution.