Abstract
The crystal structure of 1,10-dibromodecane belongs to the monoclinic system and the space group is P2 1/c with lattice dimensions of a=5.4574(3) Å, b=5.2814(4) Å, c=21.088(1) Å and β=92.897(2)° and z=2. Infrared spectra of 1,10-dibromodecane in a urea clathrate and in the crystal were observed to investigate the effect of molecular interaction on infrared intensity. The infrared intensity of the CH 2 waggings in the crystalline state is 1.5–1.9 times stronger on the relative basis than that in a urea clathrate, whereas those of CH 2 stretching, CH 2 rocking and CH 2 bending are almost the same in both states. The former enhancement is explained in terms of increase in the bond moment of the C αH 2 group on the basis of crystal structure and the electrostatic model. The relative intensity of two CH 2 asymmetric stretching changes between the two states. This is also analyzed by the use of the electrostatic model.
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