| 摘要 |
<p>Disclosed is a photographic element comprising a light-sensitive silver halide emulsion layer having associated therewith a bicyclic azole dye-forming coupler, having appended to a ring carbon at a non-coupling position thereof a substituent group represented by the formula:
<Chemistry id="chema01" num="0001"><Image id="ia01" he="37" wi="83" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" /></Chemistry> wherein the arrow represents the point of attachment of the substituent group to a non-coupling position of the coupler,
<UnorderedLists id="ula01" listStyle="none" compact="compact"><ListItem>R<Sup>1</Sup>, R<Sup>2</Sup>, R<Sup>3</Sup> and R<Sup>4</Sup> are independently selected hydrogen or substituent groups, provided that any two of R<Sup>1</Sup>, R<Sup>2</Sup>, R<Sup>3</Sup> and R<Sup>4</Sup> may join to form a ring;</ListItem><ListItem>R<Sup>a</Sup> and R<Sup>b</Sup> are independently hydrogen or a substituent;</ListItem><ListItem>each R<Sup>c</Sup> and R<Sup>d</Sup> is an independently selected hydrogen or an alkyl or aryl group, provided that any two of them may join to form a ring and n is 1 to 10;</ListItem><ListItem>R<Sup>e</Sup> is hydrogen or an alkyl or aryl group;</ListItem><ListItem>each Y is an independently selected substituent group and m is from 0 to 4; and</ListItem><ListItem>Z is a substituent selected from the group consisting of -C(O)R<Sup>5</Sup>, -S(O)<Sub>2</Sub>R<Sup>5</Sup>, -SOR<Sup>5</Sup>, -P(=O)(R<Sup>6</Sup>)<Sub>2</Sub> and -P(=O)(OR<Sup>6</Sup>)<Sub>2</Sub> in which R<Sup>5</Sup> is selected from the group consisting of alkyl, aryl, heterocyclic, alkoxy, aryloxy, alkylamino, and arylamino groups and each R<Sup>6</Sup> is independently selected from the group consisting of alkyl and aryl groups; provided that Z can form a ring with any one of R<Sup>c</Sup> and R<Sup>d</Sup>. Such an element provides improved image dye stability.</ListItem></UnorderedLists></p> |
