アミノ酸金属キレートの研究 (第2報)
N-Ethylidene-DL-threonine銅キレートの赤外部吸収スペクトル
1961 年 81 巻 6 号 p. 824-827
詳細
1961 年 81 巻 6 号 p. 824-827
In order to elucidate the chemical structure of two forms, α- and β-crystals, of threonine-copper-acetaldehyde compound, infrared spectral comparison was made on their anhydrates and rehydrated compound. The infrared absorption of the anhydrite showed the same spectrum in both forms. The anhydrite of β-crystal, when water vapor was allowed to be absorbed up to 0.4 specific pressure, showed the same spectrum as that of the β-crystal but when more water was allowed to be absorbed and then desorbed, its infrared spectrum was the same as that of the α-crystal. This showed that the β-crystal easily transited to the α-crystal in the presence of excess water. The ligand in both crystals is a Schiff base with acetaldehyde bonded to the amino group, the crystals possess two moles of water of crystallization, and their chemical structure is the same. The difference in their infrared absorption spectra was assumed to be due merely to the difference in crystal structure.
