Thioxanthates 3.73.4, Table

Substituted dithioformate anions as ligands R C(S)S are usually called dithiocarbamates (R = R2N), alkyl and aryl dithiocarbonates or xanthates (R = RO), alkyl and aryl trithiocar-bonates or thioxanthates (R = RS). Dithioacid anions (R = alkyl, aryl) have been rarely used as ligands of nickel(II) because of their instability. Structural properties of selected nickel(II) complexes with substituted dithioformate, dithiolene and related ligands are shown in Table 90. 

The structure of the monomeric low-spin (2.46 BM, room temp.) Fe(f-BuSXant)3 complex has been determined (406) (Table XIX). The coordination geometry of the iron atom is a distorted octahedron of sulfur atoms contributed by the three chelating thioxanthate ligands. The structure of the low-spin (/ieff = 2.7 BM) Fe(EtXant)3 complex has been found to contain a distorted octahedral FeS6 core (340). 

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