铽荧光配合物的合成及其在手印显现中的应用

Synthesis of rare earth fluorescent complexes containing terbium and their applications in latent fingerprint development

分别以邻、间、对甲基苯甲酸(o-,m-,p-MA)为第一配体、邻菲罗啉(o-Phen)为第二配体,利用沉淀法合成了一系列稀土铽的三元荧光配合物。对该系列稀土铽荧光配合物的合成条件(配体种类、配体用量、体系pH、反应温度、反应时间)进行了优化。将最优条件下合成的[Tb(p-MA)_3(o-Phen)]荧光配合物粉末应用到常见光滑客体表面潜在手印的显现技术中。从显现的对比度、灵敏度、选择性等方面对手印显现效果进行了详细考察。结果表明,显现后的手印在254nm紫外光的激发下,手印与客体之间的对比反差强烈,乳突纹线连贯清晰、细节特征反映明显,粉末只与乳突纹线部位吸附、基本不与小犁沟部位吸附。因此,本研究中基于铽荧光配合物的手印显现具有较强的对比度、灵敏度、选择性。

A series of rare earth fluorescent complexes containing Terbium(Tb)were synthesized via a precipitation approach,using o-,m-,p-methylbenzoic acid(o-,m-,p-MA)as the first ligand,respectively,and o-phenanthroline(o-Phen)as the second ligand.Their synthetic conditions were also optimized systematically,including the category of ligands,the molar ratio of ligands,pH,reaction temperature,and reaction time.The powders of these as-prepared[Tb(p-MA)3(o-Phen)]complexes were then used to develop the latent fingerprints on various of smooth substrates.In addition,the contrast,sensitivity,and selectivity for fingerprint development were investigated in detail.The results showed that the contrast between the developed fingerprint and the substrate was quite high,under the excitation of 254 nm ultraviolet light.The friction ridges were coherent and sharp enough,even the minutiae features of the friction ridges could be clearly observed.The fluorescent developing powders were adsorbed only on the friction ridges,rather than the furrows.Therefore,our rare earth fluorescent complex based fingerprint development could exhibit strong contrast,high sensitivity,and good selectivity.