Three Dimensional Fluorescence Spectra Representation of Natural and Treated Amber
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摘要: 基于紫外 可见吸收光谱、ESR和13C NMR谱的研究基础, 以三维荧光分光光度计为主要测试分析方法, 对具有荧光性质的天然与处理琥珀的三维荧光光谱进行了剖析。结果表明: 主峰为346 nm(λEx)/437 nm(λEm)的三维荧光光谱为天然琥珀中具π→π*跃迁能级的共轭双键结构的官能团发射所致; 热处理琥珀中某些碳官能团的局部断键是导致三维荧光光谱主峰蓝移[354 nm(λEx)/415 nm(λEm)]的主要缘由; 热填充处理琥珀的三维荧光光谱中存在多个强弱不等的发光中心, 它们与热填充处理过程中添加了外来不等量的不饱和酯共聚物或芳香族化合物有关。三维荧光光谱有助于表征热填充处理琥珀中相互包络的碳官能团, 它对天然与热填充处理琥珀及人工树脂的鉴别具有重要的标型意义。Abstract: Based on studies on the characteristics of ultraviolet-visible absorption spectra, ESR and 13C NMR spectra, the three dimensional fluorescence spectra of natural and treated ambers with fluorescence are studied by using the three dimensional fluorescence spectrophotometer. The results indicate that the three dimensional fluorescence spectrum with the main peak of 346 nm(λEx)/437 nm(λEm) is closely associated with emission of conjugated double bonds molecular with the π→π* transition energy level in natural amber. The research results also prove tentatively that the local spliting of some chemical bonds of the carbon functional group in heat treated amber is the main cause of blue shift [354 nm(λEx)/415 nm(λEm)] of the main peak of the three dimensional fluorescence spectrum. Many luminescence centers, which have different strength in the three dimensional fluorescence spectrum of heat-filling treated amber, are closely related to the unequal amounts of incorporated unsaturated ester copolymer and aromatic compound from foreign sources by heat-filling treatment. The three dimensional fluorescence spectrum lends itself to representing carbon functional groups enveloping each other in heat-filling treated amber, and it has an important representative significance for identifying the natural and heat-filling treated amber and artificially resin.
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