Methyl stearate, C~H35COOCH3, is monoclinic with a=5.61, b=7"33, c=106.6A; fl=l16 ° 47'.The cell contains eight molecules and the space group is A2/a. The carbon chains are arranged in the orthorhombic packing 0_k (101). The molecules form double sheets (dimerization) like the acids. The structure is related to the structure of the B-form of stearic acid apart from the A-centering which permits better molecular interaction.
Infrared spectra and x‐ray diffraction photographs have been recorded for some normal‐chain esters of long chain acids and long chain alcohols. The substances show no polymorphism but two different structure types exist, one with the chains tilting towards the end group planes and one with vertical chains. The IR spectra permit determination of the chain length of the acid methylene chain. The length of the alcohol chain cannot be deduced.
Ethyl stearate, C17HasCOOC2Hs, is monoclinic with a=5.59, b=7.40, c=57.1 ~; fl=l18 °. The cell contains 4 molecules and the space group is Aa. The molecules form sheets with the molecules tilting towards the end-group planes. The long chains are arranged in the orthorhombic packing 0 _L. The molecule is bent at the carboxyl group and the OC2H5 groups are roughly in an hexagonal packing and seem to be disordered or oscillating.
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