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Powder-EPR-studies at T = 295, 130 and 13 K of the thiacrown ether Au II  complex [Au II ([9]aneS 3 ) 2 ](BF 4 ) 2  diamagnetically diluted by the corresponding Zn II  complex are reported. Due to the small anisotropy of the g and the  197 Au hyperfine tensor A Au , a large  197 Au 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 AuS 4  unit of the distorted AuS 6  unit.

zeitschrift für naturforschung b

S-, X-, Q- undW-Band-Pulver-EPR-Untersuchungen am mononuklearen Au II -Komplex [Au II ([9]anS 3 ) 2 ](BF 4 ) 2  / S-, X-, Q- und W-Band Powder-EPR Investigations on the Mononuclear Au II -Complex [Au II ([9]aneS 3  ) 2 ](BF 4 ) 2