Figure 3 shows the single crystal X-ray structure of [Pd(tacn)#+, not [Pd(ta~n)~]2+.

The complex cation [Pt(1)2]2+ [(l) = 1,4,7-trithiacyclononane] shows a quasi square based pyramidal structure with one non-bonding sulphur donor atom; electrochemical oxidation at +0.5 V. vs. FcO/Fc+ (Fc = ferrocene) at 20 "C in MeCN affords a paramagnetic platinum(iri) species.

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Reaction of [{IrCl(C8Hq4),}J with 4 molar equivalents of 1,4,7-trithiacycIononane (L) in watermethanol (2:1, v/v) in the presence of HBF, affords the iridium(i1i) hydrido complex [IrHLJ2+. The complex [IrHL,] [PF,],*2MeN02 crystallises in the monoclinic space group Cc, a = 19.456 0(17), b = 8.1 52 5(9), c = 21.935(3) A, p = 11 7.008(7)", and Z = 4. The single-crystal X-ray structure of the complex shows one L ligand bound facially to lrlrr, Ir-S(l) (trans to H) 2.476(5), lr-S(4) 2.298(5), lr-S(7) 2.321 (5) A, with the second L bound as a bidentate ligand through only two S donors, Ir-S(11) 2.344(5), lr-S(41) 2.31 9(5) A; the dangling donor S(71) lies 4.329(6) A from the iridium centre. The sixth co-ordination site is taken up by a hydride, Ir-H 1.58( 6) A. Treatment of [IrHL,] [PF,], with aqueous HNO, affords the homoleptic thioether complex [ITL,]~'. The complex [IrL,] [PF,],*5MeN02 crystallises in the monoclinic space group C2/c, a = 8.581 7(13), b = 21.338( 4), c = 23.482(7) A, p = 90.94(2)", and Z = 4. The single-crystal X-ray structure of the complex confirms homoleptic hexathia co-ordination at a centrosymmetric, octahedral iridium( 111) centre, Ir-S(l) 2.342(3), lr-S(4) 2.341 (3), lr-S(7) 2.338(3) A. The redox properties of [IrL2l3+ are discussed and compared to those of the rhodium( 111) analogue [ R hL,I3+. Spectroelectrochemical measurements using a u.v.-visible optically transparent electrode system confirm the isosbestic and reversible interconversion of [RhL,I3+, [RhL,I2+, and [RhL,] +.