Resolved electron-electron coupling is observed in the room temperature solution EPR spectra of the spin-labeled copper complex (3-(A'-(3-2, 2, 5, 5-tetramethylpyrroline-l-oxyl)amido)-4, 9-dimethyl-5, 8-diazadodeca-4, 8-diene-2, l 1-dione)-copper(II). Values of the coupling constant at room temperature vary with solvent (toluene, CH2CI2, THF, 1:1 THF-CH2C12, CHCl3, pyridine, Me2SO, 1:1 toluene-acetone, and 10:1 toluene-THF), ranging from 475 G (0.0454 cm-1) in THF to 520 G (0.0496 cm-1) in Me2SO. The coupling constant is also temperature dependent with values changing from 525 G (0.0501 cm-1) at 20 °C to 472 G (0.0451 cm-1) at 119 °C in toluene solution.
ASJC Scopus subject areas
- Colloid and Surface Chemistry