Scholarlink

<p>Relaxation times of manganese(IV) complexes of mandelate, metformin, and sorbitol were measured at X-band from 4.2 to 70, 25, or 20&#xa0;K, respectively. The Mn(IV) oxidation state was confirmed by chemical titrations. The X-band continuous wave and field-swept echo-detected spectra were simulated with |<i>D</i>| = 0.077 ± 0.004 cm<sup>−1</sup>, <i>E</i> = 0.0 for Mn(IV) mandelate, |<i>D</i>| = 0.30 ± 0.03 cm<sup>−1</sup>, <i>E</i> = 0.054 ± 0.007 cm<sup>−1</sup> for Mn(IV)metformin, and |<i>D</i>| = 0.37 ± 0.007 cm<sup>−1</sup>, <i>E</i> = 0.070 ± 0.001 cm<sup>−1</sup> for Mn(IV)sorbitol. The relaxation rates (1/<i>T</i><sub>m</sub> and 1/<i>T</i><sub>1</sub>) increase with increasing zero-field splitting. Empirical modeling of the temperature dependence of <i>T</i><sub>1</sub> at temperatures above about 10 K is consistent with a Raman process.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Electron Spin Relaxation of Mn(IV) Complexes in Glassy Solvent Mixtures

  • 期刊论文

  • 发表日期：

    2026年1月11日

查看全文
  • Tanden A. Hovey,
  • Manveer Singh,
  • Surendra N. Mahapatro,
  • Sandra S. Eaton,
  • Gareth R. Eaton

摘要

Relaxation times of manganese(IV) complexes of mandelate, metformin, and sorbitol were measured at X-band from 4.2 to 70, 25, or 20 K, respectively. The Mn(IV) oxidation state was confirmed by chemical titrations. The X-band continuous wave and field-swept echo-detected spectra were simulated with |D| = 0.077 ± 0.004 cm−1, E = 0.0 for Mn(IV) mandelate, |D| = 0.30 ± 0.03 cm−1, E = 0.054 ± 0.007 cm−1 for Mn(IV)metformin, and |D| = 0.37 ± 0.007 cm−1, E = 0.070 ± 0.001 cm−1 for Mn(IV)sorbitol. The relaxation rates (1/Tm and 1/T1) increase with increasing zero-field splitting. Empirical modeling of the temperature dependence of T1 at temperatures above about 10 K is consistent with a Raman process.