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Powder-EPR studies at T = 295 K and T = 12 K on the unstable gold(II) complex [(n- C4H9)4N]2[AuII(mnt)2] diamagnetically diluted by the corresponding NiIIcomplex are reported. Due to (i) the small anisotropy of the g and the 197Au hyperfine tensor AAu, and (ii) the large 197Au quadrupole interaction the powder spectra possess a very complex pattern. Using different EPR frequencies - S band (2.4 GHz), X band (9.5 GHz), Q band (35 GHz) and W band (94 GHz) - the spectra could be analyzed successfully. All spectra were simulated with a computer program which diagonalizes the spin-Hamiltonian matrix exactly.

Powder-EPR-studies at T = 295, 130 and 13 K of the thiacrown ether AuII complex [AuII([9]aneS3)2](BF4)2 diamagnetically diluted by the corresponding ZnII complex are reported. Due to the small anisotropy of the g and the 197Au hyperfine tensor AAu, a large 197Au quadrupole interaction and the noticeable linewidts, the powder spectra show a very complex pattern. Using S-band (2.4 GHz), X-band (9.5 GHz), Q-band (35 GHz) and W-band (94 GHz) frequencies the spectra could be analysed successfully. The spectra were simulated with a computer program which diagonalizes the spin-Hamiltonian matrix exactly. According to EHT-MO calculations most of the spin-density is located in an AuS4 unit of the distorted AuS6 unit.