NEW NEUTRAL NICKEL DITHIOLENE COMPLEXES DERIVED FROM 1,3-DIALKYLIMIDAZOLIDINE-2,4,5-TRITHIONE, SHOWING REMARKABLE NEAR-IR ABSORPTION

The synthesis, solution redox properties and electronic spectra of a n ew series of stable, neutral nickel-dithiolene complexes [Ni(R(2)timdt )(2)] (where R(2)timdt is the monoreduced anion of the first example o f 1,3-dialkytimidazolidine-2,4,5-trithione and alkyl = Et, Pr-i, Bu), showing an intense electronic absorption at lambda = 1000 nm, as well as the crystal structure of the Pr-i derivative are reported.