Cyanine dyes

Details Cyanine dyes Cyanine dyes

1987-03-30

1989-07-11

Springer, David B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

428167, 428199, C07D40306

Patent

active

048473855

ABSTRACT:
A cyanine dye having formula (I): ##STR1## wherein R.sup.1 represents Cl, Br or hydrogen; R.sup.2 represents Cl, Br, hydrogen, or a nitro group; R.sup.3 and R.sup.4 each represent a methyl group, an ethyl group, a propyl group or --(CH.sub.2).sub.n OR.sup.5 (in which n is an integer of 2 or 3, and R.sup.5 represents hydrogen or an acetyl group), and X.sup..crclbar. represents an acid anion, provided that the case where R.sup.3 and R.sup.4 are both an identical alkyl group, and R.sup.1 and R.sup.2 are an identical group, is excluded; and

REFERENCES:
patent: 1524791 (1925-02-01), Konig
patent: 1863679 (1932-07-01), Wahl
patent: 3916069 (1975-10-01), Tiers et al.
patent: 4460665 (1984-07-01), Kunikane et al.
patent: 4600625 (1986-07-01), Abe et al.
patent: 4735839 (1988-04-01), Sato et al.

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