The Structures of the Bulky Basic Phosphine Sulfides Tris(2,6-Dimethoxyphenyl)Phosphine Sulfide (DMPP[dbnd]S) and Tris(2,4,6-Trimethoxyphenyl)Phosphine Sulfide (TMPP[dbnd]S)

Abstract

The structures of the title compounds (DMPP[dbnd]S = [2,6-(OCH₃)₂C₆H₃]₃P([dbnd]S), TMPP[dbnd]S = [2,4,6-(OCH₃)₃C₆H₂]₃P([dbnd]S)) have been determined from X-ray diffractometer data. DMPP[dbnd]S: orthorhombic, Pbca; a = 15.377(2), b = 17.756(2), c = 17.921(1) Å; V = 4893(1) ų; Z = 8; D_calc. = 1.34 g cm⁻¹; T = 294 ± 1 K; R = 0.044 for 2456 unique observed reflections of 5306 total data. TMPP[dbnd]S: monoclinic, P2₁/c; a = 9.067(1), b = 28.001(3), c = 11.299(1) Å, β = 109.16(1)° V = 2710(1) ų; Z = 4; D_calc. = 1.38 g cm⁻³; T = 193 ± 1 K; R = 0.042 for 2886 unique observed reflections of 5507 total data. Both molecules have a distorted propeller geometry, one of the aryl groups being close to coplanar with the P[dbnd]S bond. In both cases the P[dbnd]S bond is long (DMPP[dbnd]S, 1.969(1) Å; TMPP[dbnd]S, 1.962(1) Å).

Key Words:

• Phosphine sulfide
• X-ray structure
• basicity