X- and Q-band EPR spectra of the anionic 3d(7) 'low spin' (S=1/2) complex t
etraphenylarsonium-bis( 1,2-dicyanoethene-1,2-dithiolato)nitrosyliron(I) en
riched with Fe-57 show resolved Fe-57 and N-14 hyperfine patterns character
ised by rhombic g, A(Fe) and A(N) tensors. The hyperfine parameters an used
to determine the spin-density distribution in the FeNS4 unit. (C) 1999 Els
evier Science S.A. All rights reserved.