Crystal data for two kinds of molecular alloys between sebacic and dodecanedioic acids

Cell data for monoclinic sebacic acid COOH(CH₂)₈COOH, C₁₀H₁₈O₄, and dodecanedioic acid COOH(CH₂)₁₀COOH, C₁₂ H₂₂O₄, are accurately given: (C₁₀) a = 15.064 (6), b = 4.987 (4), c = 10.142 (6) Å, β = 133.14 (5)°; (C₁₂) a = 17.594 (8), b = 4.933 (3), c = 10.174 (5) Å, β = 132.35 (3)°. It is shown that crystallographic data for molecular alloys [C₁₀]_x[C₁₂]_{1 −x} are significantly different for those prepared by fusion (m.a.f.) and those by sublimation (m.a.s.). X-ray powder data are given for the two series of solid solutions.