First observation of the excited doublet state of a radical-triplet pair in solution:: W-Band high-field time-resolved electron paramagnetic resonance spectroscopy

被引：50

作者：

Fujisawa, J

Ishii, K

Ohba, Y

Yamauchi, S

Fuhs, M

Möbius, K

机构：

[1] Tohoku Univ, Grad Sch Sci, Inst Chem React Sci, Aoba Ku, Sendai, Miyagi 9808577, Japan

[2] Tohoku Univ, Grad Sch Sci, Dept Chem, Aoba Ku, Sendai, Miyagi 9808577, Japan

[3] Free Univ Berlin, Inst Expt Phys, D-14195 Berlin, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY A | 1999年 / 103卷 / 02期

关键词：

D O I：

10.1021/jp984069t

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Using W-band time-resolved EPR (TREPR) (95 GHz), the lowest excited doublet (D-1) state was observed in solution for the first time together with the excited quartet (Q(1)) and doublet ground (D-0) states in a complex of MgTPP (TPP; tetraphenylporphyrin) and an axial-ligating p-pyridylnitronylnitroxide radical (nit-p-py). The g value obtained for D-1 was in good agreement with the calculated value. The spin polarization of D-1 varied with time from an emission to an absorption as well as that of Q(1) and D-0. The result shows that the spin polarizations are produced by a radical-triplet pair mechanism with a ferromagnetic coupling (J > 0). The sign of the exchange coupling is consistent with that obtained in the X-band TREPR experiment.

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页码：213 / 216

页数：4

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