照相明胶与化学增感剂相互作用的XPS研究

doi:10.7517/j.issn.1674-0475.1999.02.120

影像科学与光化学 ›› 1999, Vol. 17 ›› Issue (2): 120-127.DOI: 10.7517/j.issn.1674-0475.1999.02.120

照相明胶与化学增感剂相互作用的XPS研究

张宜恒¹, 谭戟¹, 闫天堂¹, 俞书勤¹, 庄思永², 彭必先³

1. 中国科学技术大学应用化学系, 化学物理系, 合肥230026;
2. 华东理工大学精细化工研究所, 上海200237;
3. 中国科学院感光化学研究所, 北京100101

收稿日期:1998-06-18 修回日期:1998-10-19 出版日期:1999-05-20 发布日期:1999-05-20
通讯作者: 张宜恒
基金资助:
国家自然科学基金资助项目(批准号:29876038)

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

ZHANG Yi-heng¹, TAN Ji¹, YAN Tian-tang¹, YU Shu-qin¹, ZHUANG Si-yong², PENG Bi-xian³

1. Department of Applied Chemistry, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P, R.China;
2. Institute of Fine Chemical Industry, East China University of Science and Technology, Shanghai 200237, P, R.China;
3. Institute of Photographic Chemistry, The Chinese Academy of Sciences, Beijing 100101, P, R.China

Received:1998-06-18 Revised:1998-10-19 Online:1999-05-20 Published:1999-05-20

摘要/Abstract

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.S₂O₃^2-、蛋氨酸和蛋氨酸砜可以稳定共存于明胶体系之中,外加的S₂O₃^2-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S₂O₃^2-而非明胶中的蛋氨酸残基.由于Na₂S₂O₃的添加,照相明胶对AuCl₃的还原能力增强.

关键词: 照相明胶, 化学增感剂, X射线光电子能谱

Abstract: 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.

Key words: photographic gelatin, chemical sensitizer, Xray photoelectron spectroscopy

张宜恒, 谭戟, 闫天堂, 俞书勤, 庄思永, 彭必先. 照相明胶与化学增感剂相互作用的XPS研究[J]. 影像科学与光化学, 1999, 17(2): 120-127.

ZHANG Yi-heng, TAN Ji, YAN Tian-tang, YU Shu-qin, ZHUANG Si-yong, PENG Bi-xian. STUDY ON THE INTERACTION BETWEEN PHOTOGRAPHIC GELATINS AND CHEMICAL SENSITIZERS BY XPS[J]. Imaging Science and Photochemistry, 1999, 17(2): 120-127.

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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

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