Characterization of pararealgar and other light-induced transformation products from realgar by Raman microspectroscopy
Characterization of pararealgar and other light-induced transformation products from realgar by Raman microspectroscopy
复制标题
DOI：
10.1021/ac951097o
复制
发表时间：
1996-05-15
影响因子：
7.4
通讯作者：
Pavlosky, M
中科院分区：
文献类型：
--
作者：
Trentelman, K;Stodulski, L;Pavlosky, M
天然存在的硫化砷矿物颜色鲜艳，因此自古以来就被用作艺术家的颜料，雌黄，As2S3，是黄色的，通常与雄黄，As4S4，红色到红橙色有关，当暴露在阳光下时，未受保护的雄黄会产生易碎的黄色材料的表面涂层，直到最近，通常被认为是雌黄。然而，已经确定这种材料是pararealgar，雄黄的光诱导多晶型物，我们已经在文艺复兴时期大师丁托列托的一项主要工作中确定了pararealgar，艺术和历史作品中颜料的准确识别对于确定这些作品的建设，历史和未来的保护非常重要，本文报道了用拉曼显微光谱法对雄黄及光诱导雄黄转变为副雄黄过程中所涉及的各种中间体的表征，拉曼显微光谱和X射线衍射的准确和有效的表征这些硫化砷化合物的相对优点进行了讨论。
Naturally occurring arsenic sulfide minerals are brightly colored and consequently have been used as artists' pigments since ancient times, Orpiment, As2S3, is yellow and is often found associated with realgar, As4S4, which is red to red-orange, When exposed to sunlight, unprotected realgar develops a surface coating of friable yellow material that, until recently, had generally been assumed to be orpiment. However, it has been determined that this material is pararealgar, a light-induced polymorph of realgar, We have identified pararealgar in a major work by the Renaissance master, Tintoretto, The accurate identification of pigments in artistic and historic works is of great importance for determining the construction, history, and future preservation of these works, We report here the characterization by Raman microspectroscopy of pararealgar and the various intermediate species involved in the light-induced transformation of realgar to pararealgar, The relative merits of Raman microspectroscopy and X-ray diffraction for the accurate and efficient characterization of these arsenic sulfide compounds are discussed.