Electron Spin Relaxation Studies of Polydopamine Radicals,The Journal of Physical Chemistry B

当前位置： X-MOL 学术 › J. Phys. Chem. B › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Electron Spin Relaxation Studies of Polydopamine Radicals
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2021-01-20 , DOI: 10.1021/acs.jpcb.0c10485
Krzysztof Tadyszak _{1,

2} , Radosław Mrówczyński _{3,

4} , Raanan Carmieli ₅

Affiliation

We present a thoroughgoing electron paramagnetic resonance investigation of polydopamine (PDA) radicals using multiple electron paramagnetic resonance techniques at the W-band (94 GHz), electron nuclear double resonance at the Q-band (34 GHz), spin relaxation, and continuous wave measurements at the X-band (9 GHz). The analysis proves the existence of two distinct paramagnetic species in the PDA structure. One of the two radical species is characterized by a long spin–lattice T₁ relaxation time equal to 46.9 ms at 5 K and is assigned to the radical center on oxygen. The obtained data revealed that the paramagnetic species exhibit different electron spin relaxation behaviors due to different couplings to local phonons, which confirm spatial distancing between two radical types. Our results shed new light on the radical structure of PDA, which is of great importance in the application of PDA in materials science and biomedicine and allows us to better understand the properties of these materials and predict their future applications.

中文翻译：

聚多巴胺自由基的电子自旋弛豫研究

我们使用 W 波段 (94 GHz) 的多重电子顺磁共振技术、Q 波段 (34 GHz) 的电子核双共振、自旋弛豫和连续波，对聚多巴胺 (PDA) 自由基进行了彻底的电子顺磁共振研究X 频段 (9 GHz) 的测量。分析证明 PDA 结构中存在两种不同的顺磁性物质。两种自由基种类之一的特点是在 5 K 时具有长自旋晶格 T ₁弛豫时间，等于 46.9 ms，并且被指定为氧上的自由基中心。获得的数据表明，顺磁性物质由于与局部声子的不同耦合而表现出不同的电子自旋弛豫行为，这证实了两种自由基类型之间的空间距离。我们的研究结果为PDA的基本结构提供了新的线索，这对于PDA在材料科学和生物医学中的应用具有重要意义，使我们能够更好地了解这些材料的性能并预测其未来的应用。

更新日期：2021-01-28

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文