本文测定了15个一水稀土乙酰丙酮络合物的激光拉曼和红外光谱,在401、415cm~(-1)附近的拉曼谱带对不同稀土离子表现敏感,它们随原子序数变化呈现“四分组”效应,这是第一次在振动光谱中观察到的镧系递变规律。该系列络合物的振动频率变化亦符合镧系“斜W”效应的规律,这些特征规律为确认401、415cm~(-1)附近谱带为M—O拉伸振动提供了最好的证据。实验结果同时可用于讨论M—O键的性质。 In this paper, the laser Raman and infrared spectra of 15 rare earth acetylacetonate complexes were measured. The Raman bands around 401 and 415 cm -1 were sensitive to different rare earth ions, which showed “ Quartet ”effect, which is the first law of lanthanide evolution observed in the vibrational spectrum. The variation of the vibrational frequencies of the series of complexes is also in accordance with the law of lanthanide “oblique W” effect. These characteristics provide the best evidence for confirming the M-O stretching vibration near 401 and 415 cm -1 . The experimental results can also be used to discuss the properties of M-O bonds.