Hydrogen atom formation by ultrasound in D2O solutions of nitrone spin traps.
Hydrogen atom formation by ultrasound in D2O solutions of nitrone spin traps.
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在硝酮自旋陷阱的 D2O 溶液中通过超声形成氢原子。
DOI：
10.3109/10715768909088156
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
P. Riesz
中科院分区：
文献类型：
--
作者：
T. Kondo;P. Riesz
为了阐明超声诱导硝酮自旋陷阱的D2 O溶液中H原子形成的机理，在Ar存在下，将α-苯基-N-叔丁基硝酮（PBN）和α-（4-吡啶基-1-氧化物）-N-叔丁基硝酮（POBN）暴露于50 kHz超声，并检查H-自旋加合物与D-自旋加合物的ESR信号的比率（H/D比率）。H/D比随自旋陷阱浓度的增加而增加。H/D比的大小与自旋陷阱的疏水性相关。更疏水的自旋陷阱，PBN，的H/D比大于那些POBN在所有浓度。氙气，其具有比氩气低的导热率，被用于产生更高的空化气泡的最终温度。对于疏水性较低的自旋陷阱POBN的H/D比是较低的氙比氩。对于PBN在较低浓度下发现了类似的结果。这些结果表明PBN和POBN的氢加合物是由自旋陷阱或其热解产物通过C-H键的均裂断裂形成的。
To elucidate the mechanism of ultrasonically induced H atom formation in D2O solutions of nitrone spin traps, alpha-phenyl-N-tert-butylnitrone (PBN) and alpha-(4-pyridyl-1-oxide)- N-tert-butylnitrone (POBN) were exposed to 50 kHz ultrasound in the presence of Ar, and the ratio of the ESR signal of the H-spin adduct to that of the D-spin adduct (H/D ratio) was examined. The H/D ratio increased with the concentration of the spin traps. The magnitude of the H/D ratios correlates with the hydrophobicity of the spin traps. The H/D ratios for the more hydrophobic spin trap, PBN, are larger than those for POBN at all concentrations. Xenon, which has a lower thermal conductivity than argon, was employed for creating higher final temperatures of the cavitation bubbles. For the less hydrophobic spin trap POBN the H/D ratio is lower for xenon than for argon. A similar result was found for PBN at lower concentrations. These results show that the H adducts of PBN and POBN are formed from the spin traps or their decomposition products by homolytic scission of C-H bonds due to pyrolysis.
心血管组织激光消融过程中会产生短命自由基。
影响因子：
7.4
作者：
Clarke,RH;Nakagawa,K;Isner,JM
通讯作者：
Isner,JM