Claims
- 1. A cyanine dyestuff comprising a compound of formula I in which R1 and R3 independently of one another are hydrogen, (C1-C6)-alkyl which is unsubstituted or monosubstituted by halogen or phenyl, or unsubstituted or mono- or di-substituted phenyl, and R3 furthermore is also halogen or (C3-C7)-cycloalkyl, but wherein no sulpho or sulphonate groups, no carboxyl or carboxylate groups and no sulphato groups may occur as a substituent in phenyl groups, wherein the sulphonate groups are in the 5-position of the terminal indole rings, and M+ is a monovalent cation or one equivalent of a polyvalent cation, but excluding that compound of formula I in which, simultaneously, R1 and R2 are methyl, R3 is hydrogen and M+ is ½ Ni2+, that compound in which, simultaneously, R1 and R2 are ethyl, R3 is methyl and M+ is K+, and that compound in which, simultaneously, R1 and R2 are methyl, R3 is hydrogen and M⊕ is K⊕, said compound exhibiting IR absorption in the range of from about 800 to about 1000 nm.
- 2. The cyanine dyestuff of claim 1 wherein, in the dyestuff of formula I, R1 and R2 are methyl, R3 is hydrogen, and M⊕ is Na⊕.
- 3. A cyanine dyestuff of formula I in which R1, R2, and R3 independently of one another are hydrogen, (C1-C6)-alkyl which is unsubstituted or monosubstituted by halogen or phenyl, or unsubstituted or mono- or di-substituted phenyl, and R3 furthermore is also halogen or (C3-C7)-cycloalkyl, but wherein no sulpho or sulphonate groups, no carboxyl or carboxylate groups and no sulphato groups may occur as a substituent in phenyl groups, wherein the sulphonate groups are in the 5-position of the terminal indole rings and M+ is a sodium ion, an ammonium ion, a triethylammonium ion, or a hydrogen ion.
- 4. The cyanine dyestuff of claim 3, wherein M+ is a sodium ion.
- 5. The cyanine dyestuff of claim 3, wherein M+ is an ammonium ion.
- 6. The cyanine dyestuff of claim 3, wherein M+ is a triethylammonium ion.
- 7. The cyanine dyestuff of claim 3, wherein M+ is a hydrogen ion.
- 8. A cyanine dyestuff comprising a compound of formula I in which R1 and R3 independently of one another are hydrogen, (C1-C6)-alkyl which is unsubstituted or monosubstituted by halogen or phenyl, or unsubstituted or mono- or di-substituted phenyl, and R3 furthermore is also halogen or (C3-C7)-cycloalkyl, but wherein no sulpho or sulphonate groups, no carboxyl or carboxylate groups and no sulphato groups may occur as a substituent in phenyl groups, wherein the sulphonate groups are in the 5-position of the terminal indole rings, and M+ is a monovalent cation or one equivalent of a polyvalent cation, but excluding that compound of formula I in which, simultaneously, R1 and R2 are methyl, R3 is hydrogen and M+ is ½ Ni2+, said dyestuff compound exhibiting IR absorption in the range of from about 800 to about 1000 nm.
- 9. The dyestuff of claim 8 in the form of J aggregates.
- 10. The dyestuff of claim 8 exhibiting IR absorption in the range of from about 850 to about 950 nm.
- 11. The dyestuff of claim 10 in the form of J aggregates.
- 12. The dyestuff of claim 1 in the form of J aggregates.
- 13. The dyestuff of claim 1 exhibiting IR absorption in the range of from about 850 to about 950 nm.
- 14. The dyestuff of claim 13 in the form of J aggregates.
Priority Claims (1)
Number |
Date |
Country |
Kind |
44 26 892 |
Jul 1994 |
DE |
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Parent Case Info
This is a divisional application of prior application Ser. No. 08/856,890 filed on May 15, 1997, now U.S. Pat. No. 5,747,233, which in turn is a continuation of Ser. No. 08/504,107 filed on Jul. 19, 1995, now abandoned.
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Continuations (1)
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Number |
Date |
Country |
Parent |
08/504107 |
Jul 1995 |
US |
Child |
08/856890 |
|
US |