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The low-temperature form of C 18 H 38

1948; Wiley; Volume: 1; Issue: 3 Linguagem: Inglês

10.1107/s0365110x4800034x

1600-8642

Alejandro J. Müller, Kathleen Lonsdale,

Crystallization and Solubility Studies

The low-temperature form of C18H38, which is iso-structural with that of other even paraffins from C22 down to C6, is shown to be triclinic, with one molecule in the unit cell, which has dimensions a = 4.285 A., b = 4.820 A., c = 23.070 A., α = 91° 6', β = 92° 4', γ = 107° 18'. Measurements were made of 118 spacings and 65 angles, by means of Laue, powder, rotation and Weissenberg photographs. The `X-ray' density is 0.93 g.cm−3 at 21° C., as compared with the liquid density at the melting-point, 27° C., of 0.777 g.cm−3.