| 摘要 |
The present invention provides a photographic element comprising a support, at least one photosensitive silver halide layer and in or adjacent said silver halide layer a colour coupler of one of the general formulas: <IMAGE> wherein R1 is a subsituted or unsubstituted aryl or a subsituted or unsubstituted heterocylic group, R2 is a subsituted or unsubstituted, saturated or unsaturated, primary or secondary alkyl group in which the carbon atom which joins R2 to rest of the coupler has at least one fluorine atom attached to it, R3 is an electron-withdrawing group, and X is H or a coupling-off group, and wherein the electron-withdrawing properties of R1are such that the dye formed on coupling with oxidised colour developing agent 4-(N-ethyl-N-2-hydroxyethyl)-2-methylphenylenediamine has a lambda max of from 537 to 570 nm. The invention also includes the coupler composition, methods of synthesizing the coupler and a method of forming an image in a photographic element.
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