Synthesis and characterization of HN(SPiPR 2)(SePPh2) and [Te{N(SPiPr 2)(SePPh2)}2]

Perumal Sekar, James A Ibers*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


The compound HN(SPiPr2)(SePPh2) has been synthesized from the reaction of Ph2P(Se)NH2 with iPr2P(S)Cl in the presence of NaH in THF. HN(SP iPr2)(SE)PPh2) crystallizes with eight formula units in space group Pbca of the orthorhombic system in a cell of dimensions at -120 °C of a = 9.9560(6) Å, b = 17.9053(10) Å, c = 22.4156(13) Å, and V = 3995.9(4) Å3. The square-planar Te(II) complex [Te{N(SPiPr2)(SePPh2)}2] has been isolated from the reaction of Te(tu)4Cl2· 2H2O (tu = thiourea) with the anion [N(SPiPr 2)(SePPh2)]-, generated in situ from HN(SP iPr2)(SePPh2) in the presence of KO iBu. [Te{N(SPiPr2)(SePPh2)} 2] is dimorphic, crystallizing with one formula unit in space group P1̄ of the triclinic system in a cell of dimensions at -120 °C of a = 9.8476(9) Å, b = 10.3296(9) Å, c = 11.3429(10) Å, α = 101.903(1)°, β = 115.471(1)°, γ = 92.281(2)°, and V = 1008.4(2) Å3 and also crystallizing with two formula units in space group P21/n of the monoclinic system in a cell of dimensions at -120 °C of a = 8.7931(5) Å, b = 17.1830(10) Å, c = 14,1026(9) Å, β = 104.696(1)°, and V = 2061.1(2) Å3. In each instance, the [Te{N(SPiPr2)(SePPh2)} 2] molecule possesses a center of symmetry, comprising a Te center liganded in a trans manner by two bidentate N(SPiPr 2)(SePPh2) groups. However, the 31P, 77Se, and 125Te NMR spectra of [Te{N(SPiPr 2)(SePPh2)}2] show two sets of resonances at 25 °C. The 31P VT NMR spectra show two sets of resonances between -50 and +50 °C that coalesce between 80 and 100 °C, consistent with the presence of the cis as well as the trans isomer in solution.

Original languageEnglish (US)
Pages (from-to)6294-6299
Number of pages6
JournalInorganic Chemistry
Issue number20
StatePublished - Oct 6 2003

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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