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Two-Equivalent Couplers

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Organic Chemistry of Photography

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Abstract

A coupler which has no substituent at the active position is usually called a four-equivalent coupler, because totally four moles (equivalents) of silver halide are necessary to generate one mole of an azomethine dye. On the other hand, a coupler whose active position is substituted with an electro-negative atom such as chlorine, oxygen, or sulfur is called a two-equivalent coupler, because it theoretically requires two moles of silver halide to produce one mole of the corresponding dye. The dye-forming reaction involving a two-equivalent coupler is referred to as elimination coupling.

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Authors and Affiliations

  1. Department of Chemistry and Materials Technology, Kyoto Institute of Technology, 606-8585, Matsugasaki, Kyoto, Japan

    Professor Dr. Shinsaku Fujita

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  1. Professor Dr. Shinsaku Fujita
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© 2004 Springer-Verlag Berlin Heidelberg

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Fujita, S. (2004). Two-Equivalent Couplers. In: Organic Chemistry of Photography. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-09130-2_11

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  • DOI: https://doi.org/10.1007/978-3-662-09130-2_11

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-05902-5

  • Online ISBN: 978-3-662-09130-2

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