By means of X-ray powder method, the crystals of long-chain
n-alkylphosphonic acids, having carbon atoms of 1118, and their monosodium salts were studied.
The crystals of the acids were classified into three groups, one of which consisted of odd numbers of carbon and the other two were of even numbers, although the alternation of the melting point with the carbon number was not found.
When the acids were treated with the solution of neutral alkali metal salts, such as sodium chloride, the salts were formed which were insoluble in water or in organic solvent. The salts were confirmed as the monosodium salts of the acids by X-ray analysis.
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