The Crystal Structure of Tellurium Bis(diethylthionoselenophosphinate).

Husebye, Steinar; Helland-Madsen, Georg; Wahl, K.; Nielsen, P. H.; Lindberg, Alf A.; Jansen, Gert; Lamm, Bo; Samuelsson, Benny

doi:10.3891/acta.chem.scand.23-1389

Cited by 8 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They are comprised of a tellurium(II) center E,N-chelated by two symmetry-related cyclodiphosph(V)azane dichalcogenide ligands. The Te−E(1) bond distances [ 6a 2.534(1) and 6b 2.628(1) Å] are within the observed distances for corresponding Te II −S/Se systems, ,, while the long Te−N(3) distances [ 6a 2.535(4) and 6b 2.616(8) Å] suggest very weak interactions. , The ligand bite angles are 67.81(9) and 68.4(2)° for 6a and 6b , respectively, and the chalcogen atoms occupy cis positions in the coordination sphere. The E 2 N 2 unit is planar within the experimental error; the tellurium center lies only 0.011(3) and 0.001(5) Å out of the plane for 6a and 6b , respectively.…”

Section: Resultssupporting

confidence: 62%

“…For tellurium complexes involving selenium-bound ligands, the redox behavior is expected to be more pronounced. These systems have been much less studied with only a few structurally characterized tellurium(II) complexes involving 1,1-thiolateselenolates, 1,1-diselenolates, thioselenophosphinates, imidodiselenodiphosphinates,21a and selenocyanates . The latter also incorporate coordinated thiourea or selenourea ligands for stability.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Redox Chemistry of Tellurium Bis(tert-butylamido)cyclodiphosph(V)azane Disulfide and Diselenide Systems: A Spectroscopic and Structural Study

2002

View full text Add to dashboard Cite

The redox chemistry of tellurium-chalcogenide systems is examined via reactions of tellurium(IV) tetrachloride with Li[(t)()BuN(E)P(mu-N(t)Bu)(2)P(E)N(H)(t)Bu] (3a, E = S; 3b, E = Se). Reaction of TeCl(4) with 2 equiv of 3a in THF generates the tellurium(IV) species TeCl(3)[HcddS(2)][H(2)cddS(2)] 4a [cddS(2) = (t)BuN(S)P(mu-N(t)Bu)(2)P(S)N(t)Bu] at short reaction times, while reduction to the tellurium(II) complex TeCl(2)[H(2)cddS(2)](2) 5a is observed at longer reaction times. The analogous reaction of TeCl(4) and 3b yields only the tellurium(II) complex TeCl(2)[H(2)cddSe(2)](2) 5b. The use of 4 equiv of 3a or 3b produces Te[HcddE(2)](2) (6a (E = S) or 6b (E = Se)). NMR and EPR studies of the 5:1 reaction of 3a and TeCl(4) in THF or C(6)D(6) indicate that the formation of the Te(II) complex 6a via decomposition of a Te(IV) precursor occurs via a radical process to generate H(2)cddS(2). Abstraction of hydrogen from THF solvent is proposed to account for the formation of 2a. These results are discussed in the context of known tellurium-sulfur and tellurium-nitrogen redox systems. The X-ray crystal structures of 4a.[C(7)H(8)](0.5), 5a, 5b, 6a.[C(6)H(14)](0.5), and 6b.[C(6)H(14)](0.5) have been determined. The cyclodiphosph(V)azane dichalcogenide ligand chelates the tellurium center in an E,N (E = S, Se) manner in 4a.[C(7)H(8)](0.5), 6a.[C(6)H(14)](0.5), and 6b.[C(6)H(14)](0.5) with long Te-N bond distances in each case. Further, a neutral H(2)cddS(2) ligand weakly coordinates the tellurium center in 4a small middle dot[C(7)H(8)](0.5) via a single chalcogen atom. A similar monodentate interaction of two neutral ligands with a TeCl(2) unit is observed in the case of 5a and 5b, giving a trans square planar arrangement at tellurium.

show abstract

Section: Resultssupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Redox Chemistry of Tellurium Bis(tert-butylamido)cyclodiphosph(V)azane Disulfide and Diselenide Systems: A Spectroscopic and Structural Study

2002

View full text Add to dashboard Cite

show abstract

“…The P=Se (1) [2.071 (1)A] and P-Se(2) [2.227(1)A] bonds are within their normal values (Kinas, Stec & Kriiger, 1978;. The single-bond length [P-Se(2) = 2.227 (1)A] is to our best knowledge the most accurate value found in any crystallographic work published before May 1985 (Husebye & Helland-Madsen, 1969;Husebye, 1966Husebye, , 1969Penney & Sheldrick, 1971;Keulen & Vos, 1959). The P=Se bond lies in the equatorial position while the P-Se single bond is axial to the ring.…”

mentioning

confidence: 85%