Synthesis, NMR Spectroscopic Investigation, and Crystal Structures of 1,3-Dihydro-2λ4-benzotellurole-2,2-diyl Bis(diethyldithiocarbamate), C8H8Te[S2CNEt2]2; S, S'-1,3-Dihydro-2λ4-benzotellurole-2,2-diyl O,O,O''-Tetraethyl Bis(dithiophosphate), C8H8Te[S2P(OEt)2]2; and 1,3-Dihydro-2λ4-benzotellurole-2,2-diyl Bis(O-ethyl xanthate), C8H8Te[S2COEt]2

Abstract

The crystal and molecular structures of C8H8Te(S2CNEt2)2 (1), C8H8Te[S2P(OEt)2]2(2), and C8H8Te(S2COEt)2 (3) have been determined; crystals of 1 are triclinic, space group P1, a = 9.453 (1) Å, b = 10.440 (2) Å, c = 13.641 (2) Å, α = 68.28 (1)°, β = 76.74 (1)°, γ = 64.90 (1)°, Z = 2; crystals of 2 are monoclinic, space group P21/c, a = 10.856 (1) Å, b = 19.876 (3) Å, c = 12.206 (2) Å, β = 101.54 (1)°, Z = 4; crystals of 3 are monoclinic, space group C2/c, a = 17.166 (1) Å, b = 13.282 (1) Å, c = 16.349 (1) Å, β = 98.31 (1)°, Z = 8. Each of the three structures shows evidence of a stereochemically active lone pair of electrons at the tellurium atom. 1 is monomeric with the tellurium atom coordi..