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  • Author: J.J. PETTER x
  • Crystallography x
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Abstract

Single crystals of tertiary-butyl-alcohol (TBA) have been grown by a zone refining technique. A review of the phases and the properties of TBA crystals is presented. The crystal structure of phase IV has been determined at 295 K: space group P[unk], a = 6.393(2), b = 9.481(3), c = 15.126(4) Å, α = 85.47(2)°, β = 79.60(2)°, γ = 76.01(2)°, V = 874.3 Å3, Z = 6. The molecules are arranged in helical chains along the a-axis and connected by hydrogen bonds. The optical properties have been studied and interference fringes have been used to determine the birefringence of the crystals: n1−n3 = 2.55 · 10−3, n2−n1 = 7.98 · 10−4 (λ = 488 nm, T = 294.7 K). The angle between two optical axes is 69° ± 1.5° and a mean index of refraction is [unk] = 1.41 ± 0.02.