Abstract
Trialkylphosphine selenides tBu n iPr3− n PSe (n = 3, 2, 1, 0) and bidentate phosphine selenides (dppmSe2, dppeSe2) react with arenetellurenyl iodides (RTeI) furnishing complexes tBu n iPr3− n PSeTe(R)I (R = p-tolyl, p-anisyl, mesityl [Mes]), dppm[SeTe(Mes)I]2 and dppe[SeTe(Mes)I]2 that contain Se-Te(R)-I moieties (10-Te-3). Dppe[SeTe(Mes)I]2 exhibits supramolecular soft-soft interactions by “T-stacking” of the Se-Te(R)-I functions in the solid. When trialkylphosphine selenides tBu n iPr3− n PSe react with two equivalents of RTeI, novel trialkyl(aryltelluroseleno)phosphonium diiodotellurate(II) salts are formed. In solid [(tBu2iPrPSeTe-p-Tol)+(p-TolTeI2)−] the Te atom from the (p-TolTeI2)−anion behaves as soft donor towards the formally uncharged Te atom in the cation (tBu2iPrPSeTe-p-Tol)+exhibiting a novel type of Te…Te anion → cation donor-acceptor interaction (Te…Te 318 pm). Loss of mesityl groups in course of reactions with MesTeI led to a unique iodotelluroselenophosphonium salt {[(iPr3PSeTeI)+]2(TeI6)2−} with chelating cation-anion Te II …I-Te IV contacts, to the six-membered chelate complex dppmSe2TeI2 with a square planar cis-Se2TeI2 group, and to dppeSe2TeI2 with trans-Se2TeI2 groups in a helical chain structure.
Acknowledgments
We thank Prof. Dr. P. G. Jones and Prof. Dr. L. Ernst (Braunschweig, Germany) for support with X-ray crystallography and NMR spectroscopy.