照相明胶与化学增感剂相互作用的XPS研究  

STUDY ON THE INTERACTION BETWEEN PHOTOGRAPHIC \=GELATINS AND CHEMICAL SENSITIZERS BY XPS

作　　者：张宜恒[1,2,3] 谭戟 闫天堂[1,2,3] 俞书勤 庄思永[1,2,3] 彭必先 

机构地区：[1]中国科学技术大学应用化学系 [2]华东理工大学精细化工研究所 [3]中国科学院感光化学研究所

出　　处：《感光科学与光化学》1999年第2期120-127,共8页Photographic Science and Photochemistry

基　　金：国家自然科学基金

摘　　要：本文采用Ｘ射线光电子能谱技术研究了两种照相明胶与化学增感剂相互作用的机理．当两种照相明胶样品在ＨＡｕＣｌ４溶液中反应５ｍｉｎ后，明胶中的蛋氨酸、蛋氨酸亚砜均被氧化为蛋氨酸砜．与此同时，明胶吸附的大部分Ａｕ３＋被还原为Ａｕ＋，并且Ａｕ＋以络合形态存在于明胶之中．根据与ＡｕＣｌ３反应之后明胶中Ａｕ３＋与Ａｕ＋的比例，法国明胶的还原性略高于包头明胶．添加到明胶中的Ｎａ２Ｓ２Ｏ３能将明胶大分子所含的蛋氨酸亚砜全部还原为蛋氨酸．Ｓ２Ｏ３２－、蛋氨酸和蛋氨酸砜可以稳定共存于明胶体系之中，外加的Ｓ２Ｏ３２－的还原性高于明胶中蛋氨酸、蛋氨酸亚砜的还原性．添加Ｎａ２Ｓ２Ｏ３后的两种照相明胶均可以将其溶胀吸附的Ａｕ３＋全部还原为胶态金．此时，参与氧化还原反应的主要基团是Ｓ２Ｏ３２－而非明胶中的蛋氨酸残基．由于Ｎａ２Ｓ２Ｏ３的添加。The mechanism of interaction between two kinds of photographic gelatins and chemical sensitizers was studied by X-ray Photoelectron Spectroscopy. After the gelatin samples had been immersed into the chloroauric acid solution for 5 minutes, methionine and methionine sulfoxide in gelatins were oxidized to methionine sulfone, reducing most part of Au3+ to Au+ which was coordinated by gelatin macromolecule. According to the ratio of Au3+ to Au+ in gelatins, the reducing capacity of Roussalot gelatin is slightly higher than that of Baotou gelatin. Addition of sodium thiosulfate to gelatins, methionine sulfoxide was reduced to methionine. Thiosulfate, which is stronger reducer than methionine and methionine sulfoxide, could coexist steadily with methionine and methionine sulfone in gelatins. Two kinds of photographic gelatins added with Na2S2O3 can reduce Au3+ to colloid gold. In this oxide-reduction reaction, the main reducer is thiosulfate but not methionine of gelatins. The reducing capacity of photographic gelatins to chloroauric acid increased when the thiosulfate was added.

关 键 词：卤化银 相互作用 照相明胶 化学增感剂 

分 类 号：TQ572.2[化学工程—精细化工] TQ572.3