Characterisation of metal carboxylates by Raman and infrared spectroscopy in works of art
作者:Vanessa Otero、Diogo Sanches、Cristina Montagner、Márcia Vilarigues、Leslie Carlyle、João A. Lopes、Maria J. Melo
DOI:10.1002/jrs.4520
日期:2014.11
paintings were used, including lead, zinc, calcium, cadmium, copper and manganese. The fatty acids selected were the saturated acids palmitic (C16 : 0) and stearic (C18 : 0) and the polyunsaturated oleic acid (C18 : 1). Azelaic acid (C9 diacid), a product resulting from autoxidation of polyunsaturated acids, was also included. Metal carboxylates were characterised by Raman and IR spectroscopy, and their
这项工作介绍了 μ-拉曼和 μ-傅立叶变换红外 (IR) 光谱的互补用途,用于检测特定碳链和阳离子,以识别油漆微量样品中的金属羧酸盐。当游离脂肪酸与金属阳离子反应时,金属羧酸盐(金属皂)自然形成,也可能作为添加剂或降解产物被发现。合成了 22 种金属羧酸盐,并将它们的光谱组装在参考数据库中。使用了油画中常见的阳离子金属盐,包括铅、锌、钙、镉、铜和锰。所选择的脂肪酸是饱和酸棕榈酸 (C16:0) 和硬脂酸 (C18:0) 以及多不饱和油酸 (C18:1)。壬二酸(C9 二酸),多不饱和酸自氧化产生的产物,也包括在内。通过拉曼光谱和红外光谱对金属羧酸盐进行表征,并通过 X 射线衍射证实了它们的结构。事实证明,拉曼光谱和红外光谱是全面鉴定复杂老化涂料中金属羧酸盐的互补技术。拉曼能够区分 C-C 拉伸区域(1120-1040 cm-1)中的碳链长度,IR 区分 COO-拉伸吸收区域(1650-1380