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Photoacoustic and Fluorescence Spectroscopy of Metallomesogens Containing Lanthanide Ions
Yue-tao Yang*,Jun-jia Li,Xiao-jun Liu,Shu-yi Zhang,Jing Liu
Author NameAffiliationE-mail
Yue-tao Yang* Key Laboratory of Modern Acoustics, Ministry of Education, Institute of Acoustics, Nanjing University, Nanjing 210093, China yyang@nju.edu.cn 
Jun-jia Li Key Laboratory of Modern Acoustics, Ministry of Education, Institute of Acoustics, Nanjing University, Nanjing 210093, China  
Xiao-jun Liu Key Laboratory of Modern Acoustics, Ministry of Education, Institute of Acoustics, Nanjing University, Nanjing 210093, China  
Shu-yi Zhang Key Laboratory of Modern Acoustics, Ministry of Education, Institute of Acoustics, Nanjing University, Nanjing 210093, China  
Jing Liu Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China  
Abstract:
Metallomesogens Ln(bta)3L2 (Ln3+: La3+, Eu3+, and Ho3+; bta: benzoyltrifluoroacetonate; L: Schiff base) were prepared. Photoacoustic (PA) spectroscopy was used to study physicochemical properties of the liquid crystalline metal complexes. In the region of ligand absorption, PA intensity increases for Eu(bta)3L2, La(bta)3L2, and Ho(bta)3L2, in that order. It is found that the PA intensity of the ligand bears a relationto the intramolecular energy transfer process. For the first time, phase transitions of Eu(bta)3L2 from glass state to smectic A (SmA) phase and SmA phase to isotropic liquid are monitored by PA and fluorescence (FL) spectroscopy from two aspects: nonradiative and radiative transitions. The results show that PA technique may serve as a new tool for investigating the spectral properties and phase transitions of liquid crystals containing metal ions.
Key words:  Photoacoustic spectroscopy, Lanthanide complex, Liquid crystal, Relaxation process, Phasetransition
FundProject:国家自然科学基金
Photoacoustic and Fluorescence Spectroscopy of Metallomesogens Containing Lanthanide Ions
杨跃涛*,李俊嘉,刘晓峻,张淑仪,刘景b
摘要:
制备了稀土液晶配合物Ln(bta)3L2 (Ln3+:La3+,Eu3+,Ho3+;L:N-octadecyl-2-hydroxy-4-tetradec-yloxybenzaldimine;bta:benzoyltrifluoroacetonate), 所得配合物在室温下呈近晶相(SmA phase).首次利用光声光谱对金属液晶配合物的光谱性质、弛豫过程和相变进行研究.在配体吸收处,光声强度依Eu(bta)3L2
关键词:  光声光谱,稀土配合物,液晶,弛豫过程,相变
DOI:10.1088/1674-0068/21/02/99-104
分类号: