Bis(1-naphthyl) telluride

Abstract

Yellow crystals of the title compound, C20H14Te, were obtained serendipitously in an attempt to recrystallize the reduction product of (1-C10H7)[(CH(Me)COC6H5)]TeCl2 from dichloromethane. The molecule exhibits an angular geometry with almost equal Te—Caryl bonds and a C—Te—C angle close to values observed for other diaryl tellurides. One of the aromatic ring systems lies in the C—Te—C plane and the other is oriented at 76.81 (6)°, giving an almost T-shaped conformation that is compatible with the steric demand of 1-naphthyl ligands.

New Series of Intramolecularly Coordinated Diaryltellurium Compounds. Rational Synthesis of the Diarylhydroxytelluronium Triflate [(8-Me2NC10H6)2Te(OH)](O3SCF3)

“…The 125 Te CP MAS NMR spectrum of 1 shows a signal at δ iso = 701 ppm, whereas the 125 Te NMR spectrum (CDCl 3 ) of 1 reveals a signal at δ = 780.6 ppm . Both values differ substantially from each other and even more from the 125 Te NMR chemical shift (CDCl 3 ) measured for bis(1-naphthyl)telluride (δ = 466.5 ppm), which is tentatively ascribed to the presence/absence of the intramolecularly coordinating N donor atom . The 1 H and 13 C NMR spectra (CDCl 3 ) of 1 show one set of signals for the 8-dimethylaminonaphthyl substituents.…”

“…The spatial arrangement of the Te atom is distorted tetrahedral and defined by a C 2 +N 2 donor set. The average Te–C bond length of 1 (2.163(3) Å) is somewhat longer than that of bis(1-naphthyl)telluride (2.119(2) Å), presumably due to the intramolecular N-coordination. The C–Te–C angle of 1 (97.7(2)°) is very similar to the value observed for bis(1-naphthyl)telluride (96.32(9)°) .…”

“…The average Te–C bond length of 1 (2.163(3) Å) is somewhat longer than that of bis(1-naphthyl)telluride (2.119(2) Å), presumably due to the intramolecular N-coordination. The C–Te–C angle of 1 (97.7(2)°) is very similar to the value observed for bis(1-naphthyl)telluride (96.32(9)°) . The two Te···N bond lengths of 1 (2.699(4), 2.827(4) Å) differ by 0.128(4) Å for no obvious reason, but the average (2.763(4) Å) resembles values found for bis(8-dimethylaminonaphthyl)ditelluride (2.699(5), 2.743(5) Å) and bis(8-dimethylaminonaphthyl)tritelluride (2.66(1), 2.68(1) Å) .…”

“…Both values differ substantially from each other and even more from the 125 Te NMR chemical shift (CDCl 3 ) measured for bis(1naphthyl)telluride (δ = 466.5 ppm), which is tentatively ascribed to the presence/absence of the intramolecularly coordinating N donor atom. 14 The 1 H and 13 C NMR spectra (CDCl 3 ) of 1 show one set of signals for the 8dimethylaminonaphthyl substituents. The two N-methyl groups are chemically equivalent and give rise to one singlet at δ = 2.73 ppm ( 1 H) and 46.5 ppm ( 13 C), respectively.…”

“…The C−Te−C angle of 1 (97.7(2)°) is very similar to the value observed for bis(1naphthyl)telluride (96.32(9)°). 14 The two Te•••N bond lengths of 1 (2.699(4), 2.827(4) Å) differ by 0.128(4) Å for no obvious reason, but the average (2.763(4) Å) resembles values found for bis(8-dimethylaminonaphthyl)ditelluride (2.699(5), 2.743(5) Å) 15 and bis(8-dimethylaminonaphthyl)tritelluride (2.66(1), 2.68(1) Å). 16 The 125 Te CP MAS NMR spectrum of 1 shows a signal at δ iso = 701 ppm, whereas the 125 Te NMR spectrum (CDCl 3 ) of 1 reveals a signal at δ = 780.6 ppm .…”