Density and unit cell of n-hexatriacontane

n-Hexatriacontane, Ca6H74 , is orthorhombic with the unit cell a ----7.4400.02, b = 4.9554-0.01, c = 47"61-4-0"10 A. Density calculated from X-ray data is 0.95930.004 g.cm. -a at 20 C., observed 0.9609 0.0002 g.cm. -3. Thermal expansion and densities of the hexagonal form and of the liquid are given, and chain cross-sections are discussed. They are 17.64 at --183 C., 18.43 at 20 C., 20-30 for the hexagonal form at 75 C. and 22.65 .A_ 9 for the liquid at 76 C. In the liquid, the chains are packed in a square lattice. The interchain distance does not alter much on the melting of the hexagonal form.