Technetium complexes with arylselenolato and aryltellurolato ligands

Abstract

Reactions of (NBu)[TcOCl] or [TcCl(PPh)(CHCN)] with in situ-prepared lithium arylselenolates and -tellurolates give (NBu)[TcO(ArE)] (E = Se, Te; Ar = phenyl) and [Tc(ArE)(PPh)(CHCN)] (E = Se, Te; Ar = phenyl, 2,6-Mephenyl, mesityl) complexes, respectively. The products contain square-pyramidal (Tc compounds) and trigonal bipyramidal (Tc complexes) coordinated technetium atoms. Density functional theory calculations indicate that the Tc-chalcogen bonds in the Tc compounds have a greater bond order than those in the Tc compounds.

Reactions of Schiff Base‐Substituted Diselenides and ‐tellurides with Ni(II), Pd(II) and Pt(II) Phosphine Complexes

“…The reaction conditions of such procedures must be controlled carefully in order to avoid the parallel reduction of the transition metal ions. [ 17,18 ] Occasionally, nickel, palladium and platinum complexes with organochalcogenolato ligands have been prepared from the dichalcogenides via an oxidative addition to a low‐valent metal species. [ 19–23 ] In the case of palladium, organochalcogenolato complexes are also accessible via an oxidative addition to Pd II with formation of Pd IV species.…”

Rhenium(V) Complexes with Selenolato‐ and Tellurolato‐Substituted Schiff Bases – Released PPh3as a Facile Reductant

“…The reaction conditions of such procedures must be controlled carefully in order to avoid the parallel reduction of the transition metal ions. This problem has been described in detail for the synthesis of complexes of the composition (NBu 4 )[M V O(arylselenolate) 4 ] (M = Tc, Re), where the use of Li(BH 4 ) in THF proved to be a suitable and easy to control reductant , . Recently, an oxidorhenium(V) complex with pyridylselenolato ligands was prepared by the reaction of the corresponding diselenide with [ReOCl 3 (PPh 3 ) 2 ] without the addition of a reducing agent.…”

Large Telluroxane Bowls Connected by a Layer of Iodine Ions

“…In the context of our studies on transition metal complexes with tellurium‐containing ligands,[ 12 , 13 , 14 , 15 ] we synthesized some telluroethers such as N ‐{3‐(phenyltellanyl)propyl}picolinamide ( I ) or 3‐(phenyltellanyl)propylamine ( II ) as building blocks for chelating ligands. The oxidation of compound I with elemental iodine did not yield the expected tellurium(IV) diiodide, but gave a red‐brown, crystalline substance of the composition [{(PhTe) 19 O 24 } 2 I 18 (pyridine)] ( 1 a ).…”

“…In the context of our studies on transition metal complexes with tellurium-containing ligands, [12][13][14][15] we synthesized some telluroethers such as N-{3-(phenyltellanyl)propyl}picolinamide (I)or3-(phenyltellanyl)propylamine (II)asbuilding blocks for chelating ligands.T he oxidation of compound I with elemental iodine did not yield the expected tellurium-(IV) diiodide,b ut gave ar ed-brown, crystalline substance of the composition [{(PhTe) 19 O 24 } 2 I 18 (pyridine)] (1a). Single crystals of the product were obtained from aC H 2 Cl 2 /CHCl 3 / MeOH (3:8:3) mixture.T hey consist of large,s pherical clusters with an almost planar layer of eighteen iodine atoms between two half-shells each composed from a{(PhTe) 19 O 24 } 9+ network (Figure 1).…”