Nitroxydes

The vibrational group frequency of the N–O stretching band of nitroxide stable free radicals

“…The spectrum was first reported in a study [22] by Table 1, first described by the latter two authors of this present paper. In this instance it is known that ν(N-O • ) was assigned by reference to the aforementioned reviews [5,6].…”

“…Bands were assigned by visual inspection of the vibrations using the animation feature of the GaussView 3.0 program. [14] 1344 124 159 VII R: C=O (TEMPONE) 1380 [13] 1372 125 159 VIII R: CHOH (TEMPOL) 1371 [13] 1343 124 159 IX R: C=NOH 1362 [16] 1346 125 156 Piperidine ring X R: CHOC=OPh 1350 [16] 1351 125 159 Cyclic nitroxides 5-membered XI R: CONH 2 1310 [22] 1438 [16] 1423 114 171 [26] 1427, 1417…”

Electron spin resonance study of the hyperfine splitting constants of naturally abundant carbon-13 and nitrogen-15 in diphenylmethyl tert-butyl aminoxyl (nitroxide). Solvent and temperature effects

“…It is evident that all hyperfine coupling constants increase with increase in polarity of the solvent. This observation agrees with the data published for di-tert-butyl aminoxyl (5).…”

Nitroxides XLVIII: A study of the interaction between bovine serum albumin and a modified steroid by electron spin resonance

“…Association constant. We have calculated the West- * This variation is consistent with the known nitrogen splitting dependence on solvent polarity [9]. For temperature dependence of the hyperfine splitting in a similar steroidal nitroxide, see [lo].…”

“…Under the same conditions, the smaller nitroxide molecules [9] tanol and tanane (see structural formulas (2) and (3), respectively) give rise to two superimposed spectra [4] : one assigned to free nitroxide in water, and the other one to an almost free nitroxide in a non-polar site. Quantitative data on this binding equilibrium between BSA and various small nonsteroidal nitroxide ligands will be reported in future publications.…”