Pt, Pd and Hg Complexes with Potentially Tridentate Telluroether Ligands

Abstract

Keywords: Tellurium / Ligand design / Palladium / Platinum / Mercury / Solid-state structures N-[3-(Phenyltellanyl)propyl]picolinamide (HL1) or N-[NЈЈ,NЈЈ-methyl(phenyl)aminothiocarbonyl]-NЈ-[3-(phenyltellanyl)propyl]benzamidine (HL2) react with equivalent amounts of PtCl 2 or PdCl 2 with formation of neutral [MCl(L1-κN,NЈ,Te)] or [MCl(L2-κS,N,Te)] chelates. A corresponding reaction of HL2 with HgCl 2 results in the formation of [HgCl 2 (HL2-κS,Te)]. Treatment of [PtCl(L1-N,NЈ,Te)] with elemental iodine results in the exclusive oxidation of the metal [a] Scheme 2. Synthesis of HL1 and HL2.Both products were obtained as viscous oils, which could not be solidified even after several chromatographic purifi-Eur.

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

“…For most of the structural parameters, a linear dependence with the size of the chalcogen or the size of the metal is observed along the series [M(L S )(PPh 3 )] – [M(L Se )(PPh 3 )] – [M(L Te )(PPh 3 )]. The Pd1–Te1 and Pt1–Te1 bonds of 2.4825(2) and 2.502(1) Å are similar to the shortest bond lengths reported in previous studies of palladium [ 21,25–29,34,36–38 ] and platinum [ 39–52 ] phenyltellurolato complexes. Remarkably and probably as a result of the strain in the five‐membered Te1–Ni1–N1 chelate ring, the Ni1–Te1 bond length in [Ni(L Te )(PPh 3 )] is only 2.4050(5) Å.…”

“…Selected bond lengths [Å] and angles (°) in the dichalcogenides {HL Y } 2 [30] and their nickel, palladium and platinum complexes [M(L Y )(PPh 3 )] (Y = Se, Te). [21,[25][26][27][28][29]34,[36][37][38] and platinum [39][40][41][42][43][44][45][46][47][48][49][50][51][52] [53] Ni(TeMes)Cp(PEt 3 ), [54] [W(CO) 5 -μ-(TePh)NiCp(PPh 3 )] [55] and [57] [(NiCpiPr 4 ) 2 -μ-( Te) 2 ] (2.44-2.45 Å), [58] [CpFe(C 5 H 4 )-Te(I) 2 -Ni(NHC)Cp] (2.4407(8) Å) [59] and (μ 4 -telluro)-hexakis(μ 3 -telluro)bis(μ 2 -bis(diphenylphosphino)methane)-bis(η 5 -tert-butylcyclopentadienyl)-pentanickeldiniobium (2.436(5) Å) [60] show the overall shortest Ni-Te bond lengths. (m/z = 538.0818) can be observed.…”

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).…”

Large Telluroxane Bowls Connected by a Layer of Iodine Ions

“…In the context of our studies on transition metal complexes with tellurium‐containing ligands, [12–15] 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 ).…”