An Electron Diffraction Investigation of the Molecular Structure of Di-t-butylnitroxide Free Radical in the Vapour Phase.

Experimental evidence for covalent binding of an organic nitroxide free radical to radiation induced DNA radicals

“…A possible reason for the pronounced stability of unirradiated TAN is that its free radical, located at the nitrogen-oxygen bond, is sterically hindered through the presence of the neighbouring methyl groups [8] When solutions containing TAN and DNA were chromatographed on Sephadex G-25 columns, spectrophotometric mesurements of the eluate revealed two well separated peaks, the first one due to DNA, the second one due to TAN.…”

Capture of NO by a Frustrated Lewis Pair: A New Type of Persistent N‐Oxyl Radical

“…X-ray crystal structure analysis of 3 ( Figure 1) revealed that both the phosphorus and the boron atoms have formed bonds to the nitrogen atom of the incorporated NO molecule (PÀN: 1.7127 (14) , BÀN: 1.592(2) , P-N-B: 114.27(10)8). The NÀO bond distance in 3 of 1.2962(17) is significantly lengthened relative to that of free NO (1.151 ); [12] it is similar to that found in N-oxyl radicals R 2 N-OC such as TEMPO (4: 1.284(8) ) [13] and tBu 2 N-OC (1.28(2) (gas phase) [14] ). The odd-electron species 3 exhibits an X-band EPR signal at room temperature in fluorobenzene solution consistent with coupling of the electron spin to the 14 N nucleus as well as to 31 P and 11/10 B nuclei ( Figure 2).…”

Structure du radical nitroxyde tétraméthyl-2,2,6,6 piperidinol-4 oxyle-1

“…Le groupement C(3)C'(3)NO(2) n'est pas plan; l'angle que fait la liaison N-O avec le plan C(3)C'(3)N vaut 21 °, et la distance de l'atome 0(2) 5. ce plan vaut 0,3/~; vules 6carts standards mentionn6s au paragraphe pr6-c6dent, ces r6sultats sont largement significatifs. La plan6it6 du groupement 6tait prise comme hypoth~se dans le travail de Andersen & Andersen (1966)• L'encombrement des quatre groupements m6thyl en 2,2,6,6 conf6re une grande stabilit6 au groupement nitroxyde; certaines distances entre atomes non li6s de Description'de la structure…”

“…La structure en phase gazeuse par diffraction des 61ectrons du di-t-butyl nitroxyde (Andersen & Andersen, 1966).…”