发明名称 |
ALKANEDIYL BRIDGED BENZIMIDAZOLO MONOMETHINE CYANINE DYES, PROCESSES FOR THEIR PREPARATION, AND PHOTOGRAPHIC EMULSIONS AND ELEMENTS CONTAINING SUCH DYES |
摘要 |
Alkanediyl bridged benzimidazolo monomethine cyanine dyes are disclosed wherein at least one benzimidazolo nucleus is provided with an electron-withdrawing group. A disclosed preparation of the dyes includes producing an electron-withdrawing group substituted bis(2-nitrophenyl)-2-R1-propanediamide, where R1 is hydrogen or alkyl; converting the nitro groups to primary amine substituents; removing the elements of water to effect ring closure; and thereafter providing the -CR1- linked benzimidazole nuclei so formed with an N,N'-alkanediyl bridging group and quaternizing substituents. Dye synthesis is completed by reducing the -CR1- linking group to the corresponding methine. The dyes are useful as sensitizers in silver halide emulsions and photographic elements. |
申请公布号 |
DE3478227(D1) |
申请公布日期 |
1989.06.22 |
申请号 |
DE19843478227 |
申请日期 |
1984.03.01 |
申请人 |
EASTMAN KODAK COMPANY |
发明人 |
GILBERT, DAVID PHILIP |
分类号 |
C09B23/00;C09B23/04;G03C1/12;G03C1/18;G03C1/26;(IPC1-7):C09B23/04 |
主分类号 |
C09B23/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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