Enhanced Resolution of Close g Values in the High-Field, High-Frequency EPR Compared to the X-Band

EPR spectrum of [Cu₂Zn₂(NH₃)₂Br₂(HL)₄]Br₂ · CH₃OH

where HL^-  is the anion of diethanolamine, H₂L

The X-band EPR spectrum (above) of [Cu₂Zn₂(NH₃)₂Br₂(HL)₄]Br₂ · CH₃OH in which two copper ions are exchange-coupled, was uninterpretable because of extensive overlap of the "parallel" and "perpendicular" features. High-field EPR spectrum (below) allowed the determination of the spin Hamiltonian parameters of the spin-triplet state:

g_x = 2.053, g_y = 2.055, g_z = 2.251, |D| = 101∙10^-4 cm^-1  ,

|E| = 6∙10^-4 cm^-1, Ax = Ay = 0, Az = 94∙10^-4 cm^-1

Separate coordinate frames were used for tensors g and D in that g_zz is perpendicular to D_zz.

Related Links

• A Cu-Zn-Cu-Zn heterometallomacrocycle shows significant antiferromagnetic coupling between paramagnetic centres mediated by diamagnetic metal, Elena A. Buvaylo, Vladimir N. Kokozay, Olga Yu. Vassilyeva, Brian W. Skelton, Julia Jezierska, Louis C. Brunel and Andrew Ozarowski, Chemical Communications, 39, 4976-4978 (2005)
• Numbers useful in EPR
• Submit a proposal