铒氨基酸固态配合物的光声光谱研究

合成了Er(Gly)3Cl3·3H2O、Er(Ala)3Cl3·3H2O和Er(Gly)3Phen·3H2O二元及三元固态配合物微晶粉末,在300nm～800nm范围内测定并解释了其光声光谱。通过对光声相对强度计算得到铒氨基酸固态配合物的光声支量,讨论了氨基酸配体对中心稀土离子铒f-f跃迁的微扰作用。结合Er(Ala)3Cl3·3H2O配合物的光声光谱和吸收光谱研究了其荧光性质及弛豫模型。     

钕离子光声探针研究二氧化钛凝胶的结构变化

采用溶胶-凝胶法制备了掺杂钕离子的TiO2纳米晶粉末样品.以钕离子作为光声探针,结合热分析和X射线衍射分析,研究了TiO2从凝胶到不同晶相纳米晶转变的结构变化.结果表明:随热处理温度的逐渐升高,样品中钕离子的电子云重叠效应增强,超灵敏跃迁的振子强度增大,说明水和乙醇不断挥发、残留有机物氧化燃烧;当超过900℃,钕离子的电子云重叠效应减弱,振子强度也变弱,该过程样品晶相发生了转变;样品光声光谱吸收边反映出的结构变化与上述研究结果一致.     

Study of erbium (Ⅲ) doped titanium dioxide nanoparticles by photoacoustic spectroscopy

Nanocrystalline titania as photocatalyst has attracted considerable attention for its potential use in environmental cleaning.Recently,lanthanide ions doped titania samples have been shown to increase the photocatalytic efficiency of selected reactions.In this work,TiO2 nanoparticles doped with Er3+ were prepared via an ultrasonic assisted sol-gel method.The optical properties of the samples were determined by photoacoustic(PA) spectroscopy.It was found that the absorption edge shifted to lower wavelength w...     

稀土色剂和釉瓷的光声光谱研究

光声光谱适于研究不透明、高反射、高散射的稀土色剂和釉瓷的光学性质。本文测定了Ｐｒ－Ｚｒ黄、Ｐｒ－Ｖ－Ｚｒ绿、Ｎｄ－Ｚｒ紫色剂和釉瓷的光声光谱，探讨了稀土离子的存在状态和着色机理，提出以谱图作为确定色调和判断质量的客观依据。     

稀土腈纶染色的光声光谱研究

本文报道了染色腈纶及染色过程中染液和腈纶的光声光谱分析新方法，据此探讨了稀土在染色过程中对染料和腈纶的影响，确证了稀土的促染、匀染和缓染作用。     

Photoacoustic Spectral Analysis of f-f Transitions of Neodymium Compounds with TFA and HFA

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Study on F-F Transitions of Powdered Neodymium Compounds by Photoacoustic Spectroscopy

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Relaxation process and phase transition of lanthanide liquid crystalline complexes by photoacoustic spectroscopy

Lanthanide-containing liquid crystals exhibiting smectic A phase close to room temperature were obtained. Photoacoustic （PA） spectroscopy was used to study the spectral properties and phase transitions of liquid crystalline metal complexes. It was found that PA intensity of the ligand had a relationship with the probability of nonradiative transitions, which increased in the order of Eu（tta）3L2〈La（tta）3L2〈 Tb（tta）3L2〈Er（tta）3L2. The relaxation processes of the complexes were studied in depth from two aspects： radiative and non-radiative processes, combining with their fluorescence spectra. Phase transitions of europium（m） and erbium（m） complexes, in the temperature range of 383-358 K, could be clearly monitored by both PA amplitude and PA phase signals. As the temperature crossed the transition point, PA amplitude showed a minimum and PA phase a maximum. The results indicated that PA technique could serve as a new tool for investigating the physicochemical properties of liquid crystals containing metal ions.     

稀土配合物掺杂二氧化硅凝胶的原位光声光谱研究

采用溶胶-凝胶法,制备了Ln(Bipy)2Cl3·2H2O (Ln3+: Eu3+,Er3+;Bipy:2,2'-联吡啶)配合物掺杂的二氧化硅凝胶样品.首次采用光声光谱分析了配合物在凝胶中的形成.对于仅经室温陈化、干燥的两种配合物掺杂的湿凝胶样品,在配体吸收处光声强度相同;而经120℃热处理后的凝胶样品在配体吸收处的光声强度有明显差别.结合荧光和红外光谱的结果表明,未经适当的热处理过程,凝胶样品中稀土配合物尚不能形成.进一步据光声谱计算了凝胶样品中铒离子的电子云重叠参数和光声支量值,分析了稀土离子的配位环境和成键性质变化.