Indium complexes sulfur ligands

Indium(III) complexes of dianionic sulfur ligands are mostly those derived from toluene-3,4-dithiolate (TDT ), l,2-dicyanoethylene-l,2-dithiolate (MNT ), 1,2-ethanedithiol (EDT ), or l,l-dicyanoethylene-2,2-dithiolate (i-MNT ). Various adducts (e.g., four-coordinate [In(MNT)2], five-coordinate [XIn( -MNT)2] (X = C1, Br, or I), or six-coordinate [In( -MNT)3] ) have been reported. " ... 

Two other types of unusual indium(II)-oxygen ligand complexes are known. The polar-ographic reduction of In(acac)3, In(tropolonate)3 or In(pyronate)3 (pyronate = 3-hydroxy-2-methyl-4-pyronate anion) in non-aqueous solution shows a one-electron reduction in each case, corresponding to the formation of a (formally) In complex. Similar behaviour was observed with In(oxine)3, and in some cases a second one-electron reduction was also observed, implying the formation of In species, although in no case was the site of the reduction identified, so that the product may be either [In (acac)3] or [In (acac)2(acac )] (c/. sulfur ligands. Section 25.2.3.4). 

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