Recent developments in the chemistry of selenoethers and telluroethers

Solution, Structural and Catalytic Studies of Neutral MCl2 (M = Pd, Pt) Complexes of the N/E Mixed‐Donor Ligands 2‐(RECH2)C5H4N(RE = MeS, PhS, MeSe)

“…Reports of similar compounds containing diselenoether and ditelluroether ligands are now more prevalent and include solution properties ascertained by using multinuclear NMR spectroscopy. [4] In contrast, complexes containing mixed-N/S or N/Se donor groups have not been as extensively studied, nor have these studies generally included systematic investigations into the complexes' behaviour in solution.…”

Synthesis and characterization of two novel tin(IV) compounds containing 12‐membered metallarings

“…The base peak in both spectra corresponds to the ions C 4 H + 9 , and the fragmentation patterns are similar to that of 2 with the loss of C 2 H 4 X (X = S,O) and C 3 1 H NMR spectra of compounds 3a and 3b confirm the identity of the compounds, showing the expected integration and multiplicities. With transition metals and a similar ligand, a mixture of trans and cis products was obtained and was observed because the 13 C NMR spectra show a double set of signals, one for each isomer [9].…”

Selenoether macrocyclic chemistry–syntheses and ligand properties of new small-ring Se3- and Se2N-donor macrocycles

“…1−3 Despite significant progress in thioether macrocyclic chemistry, macrocycles involving the heavier selenoether and telluroether functions are much less well developed -especially potentially tridentate small rings. 2,3,5 Synthetic routes to tetraselena-and hexaselena crowns were originally reported by Pinto et al [6][7][8] and the coordination chemistry of especially [16]aneSe 4 (1,5,9,13-tetraselenacyclohexadecane) and to a lesser extent [24]aneSe 6 (1,5,9,13,17,21-hexaselenacyclotetracosane) have been developed with both d-block and p-block elements. 5,[9][10][11][12] The macrocyclic framework facilitates stabilization of unusual species such as [CrX 2 ([16]aneSe 4 )]PF 6 (X = Cl, Br or I), [NiX 2 ([16]aneSe 4 )] containing the hard, oxo-philic d 3 Cr(III) and labile d 8 Ni(II) ions respectively, 9,10 within a selenium-rich coordination environment, and trans-[PtX 2 ([16]aneSe 4 )](PF 6 ) 2 (X = Cl or Br) based upon distorted octahedral Se 4 X 2 coordinated Pt(IV).…”

“…2,3,5 Synthetic routes to tetraselena-and hexaselena crowns were originally reported by Pinto et al [6][7][8] and the coordination chemistry of especially [16]aneSe 4 (1,5,9,13-tetraselenacyclohexadecane) and to a lesser extent [24]aneSe 6 (1,5,9,13,17,21-hexaselenacyclotetracosane) have been developed with both d-block and p-block elements. 5,[9][10][11][12] The macrocyclic framework facilitates stabilization of unusual species such as [CrX 2 ([16]aneSe 4 )]PF 6 (X = Cl, Br or I), [NiX 2 ([16]aneSe 4 )] containing the hard, oxo-philic d 3 Cr(III) and labile d 8 Ni(II) ions respectively, 9,10 within a selenium-rich coordination environment, and trans-[PtX 2 ([16]aneSe 4 )](PF 6 ) 2 (X = Cl or Br) based upon distorted octahedral Se 4 X 2 coordinated Pt(IV). 11 The only known examples of Se 3 macrocycles are [12]aneSe 3 , 13 a naphthyl based Se 3 -donor ring 14 and Me 6 [12]aneSe 3 , 15 the latter obtained via catalytic cyclooligomerisation of 3,3-dimethylselenetane using rhenium carbonyl species.…”