Wilkinson D A, Watkin J E
Canadian Police Research Centre, National Research Council of Canada M-54, Ottawa, Ontario.
Forensic Sci Int. 1993 Jun;60(1-2):67-79. doi: 10.1016/0379-0738(93)90094-q.
The application of europium luminescence to the visualisation of cyanoacrylate developed fingerprints is reported. Extremely fluorescent europium chelates are produced by the reaction of Eu3+ ions with aryl-beta-diketones. Excitation of the organic ligand occurs at 350 nm for europium tris(thenoyltrifluoroacetone) (TEC) and europium narrow band (10 nm) emission is observed at 614 nm as a result of an intramolecular energy transfer. The europium aryl-beta-diketone complexes are transferred into the interior of the polymeric cyanoacrylate from an aqueous methyl ethyl ketone solution. A two phase system is established with methyl ethyl ketone, water and chelate outside the polymer and methyl ethyl ketone and chelate inside. As the print dries the ketone evaporates 'locking' the chelate inside the cyanoacrylate. Sufficient TEC is deposited in the polymer so that the print is easily seen under 7 mW/cm2 of Hg light. Washing away of background contamination does not harm the fluorescent print. Prints deposited on cadaver skin and fumed with cyanoacrylate have been detected with good detail by this method.
本文报道了铕发光在可视化氰基丙烯酸酯显现指纹方面的应用。Eu3+离子与芳基β - 二酮反应可生成极具荧光性的铕螯合物。对于三（噻吩甲酰三氟丙酮）铕（TEC），有机配体在350 nm处被激发，由于分子内能量转移，在614 nm处观察到铕的窄带（10 nm）发射。铕芳基β - 二酮配合物从甲基乙基酮水溶液转移到聚合氰基丙烯酸酯内部。聚合物外部形成了由甲基乙基酮、水和螯合物组成的两相体系，聚合物内部则是甲基乙基酮和螯合物。随着指纹干燥，酮蒸发，将螯合物“锁定”在氰基丙烯酸酯内。聚合物中沉积了足够的TEC，使得在7 mW/cm2的汞灯下指纹易于观察。洗去背景污染物不会损害荧光指纹。用这种方法已能清晰地检测出沉积在尸体皮肤上并用氰基丙烯酸酯熏显的指纹。
