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

doi:10.7517/j.issn.1674-0475.1999.02.120

Imaging Science and Photochemistry ›› 1999, Vol. 17 ›› Issue (2): 120-127.DOI: 10.7517/j.issn.1674-0475.1999.02.120

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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

Abstract

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

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

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