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本文从拉曼光谱观察水合分子对无水、一水、三水稀土乙酰丙酮络合物的金属—氧(M—O)拉伸振动带的影响,发现无水络合物在400cm~(-1)附近只有一个振动带,一水络合物在400和415cm~(-1)附近有两个强度不等的振动带,它们的M—O振动频率随原子序数变化都呈“四分组”效应,而三水络合物400cm~(-1)附近带变形,且随轻、重稀土而异,从而干扰了镧系变化规律,没有系统的“四分组”效应。由于一水络合物415cm~(-1)附近带随脱水而消失,吸水而复现的可逆实验事实,修正了前文对415cm~(-1)附近带的指定,而归属于(M—O)H_2。络合物M—O拉伸带随水合分子变化反映灵敏,出现特征带形。
In this paper, the effects of hydration molecules on the metal-oxygen (M-O) stretching vibration bands of anhydrous acetylacetone complexes were investigated by Raman spectroscopy. 1), there is only one vibrational band near the 400 and 415 cm -1 in the water complex. The M-O vibration frequency of the water complex changes with the atomic number in four groups Effect, and the Sanshui complex deforms around 400cm ~ (-1) and varies with light and heavy rare earths, which interferes with the variation of lanthanides. There is no systematic “quadruple” effect. Due to the reversible experimental fact that the vicinity of 415cm -1 of the water complex disappears with dehydration and absorbs water, the above assumptions for the vicinity of 415cm -1 are corrected, while those belonging to (M-O ) H_2. The M-O stretching band of the complex is sensitive to the change of hydration molecules, and the characteristic band appears.