摘要
首次利用相分辨光声光谱法对稀土配合物中不同吸收中心的重叠谱峰进行了分离。在Nd(Trp) 3 Cl3 ·H2 O固态配合物中 (Trp :色氨酸 ) ,30 0～ 4 0 0nm这一波段内由于色氨酸配体强的π π 跃迁吸收 ,Nd3 +的光声峰被掩盖。通过光声谱同相和交相信号可以计算配体光声吸收的位相为 10 6° ,位相改变 90°后就得到仅与Nd3 +相关的光声光谱。相分辨光声光谱法用于谱峰分离时有它独特的优点 ,它不受谱峰形状和重叠程度的限制 。
Photoacoustic(PA) phase-resolved method is used to separate the overlapping peaks of lanthanide complex for the first time. PA peaks of Nd3+ are covered completely by the PA absorption of tryptophan(Trp) for Nd(Trp)(3)Cl-3 . H2O within 300-400 nm. The patterns of PA phase spectrum depend on the ligand and lanthanide ion, and the phase angles are associated with the lifetime of the excited states and the optical absorption coefficient. Different phase angles of the ligand and lanthanide ion bring the possibility to separate their overlapping peaks by PA phase-resolved method. The phase ankle of Trp(106degrees) is calculated according to the in-phase and out-of-phase signals. In the PA amplitude spectrum, only he contribution of Nd3+ can be observed when the phase angle varies 90degrees. PA peaks of Nd(Trp)(3)Cl-3 . H2O are separated well and assigned. PA phase-resolved method has the advantage to interpreted the spectrum based on different phase angles, and is free from the overlapping of different absorption bands.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2002年第4期566-568,共3页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金资助项目
关键词
重叠峰
分离
相分辨光声光谱
芳香氨基酸
稀土配合物
photoacoustic spectroscopy
phase-resolved method
aromatic amino-acid
lanthanide complex
