Patent ID: 6072059
Filing Date: 2000-06-06
Classification: C09B,G03C

Abstract:
A heptamethine cyanine compound represented by the formula (IIa): in which each of R.sup.1 and R.sup.2 independently is an alkyl group, a substituted alkyl group, an alkenyl group, a substituted alkenyl group, an aralkyl group or a substituted aralkyl group; R.sup.3 is cyano, --SO.sub.2 R.sup.31, --OR.sup.32 or --SR.sup.33 ; each of R.sup.11, R.sup.12, R.sup.21 and R.sup.22 independently is an alkyl group, or R.sup.11 and R.sup.12 or R.sup.21 and R.sup.22 are combined with each other to form a saturated aliphatic spiro ring; a each of R.sup.31, R.sup.32 and R.sup.33 independently is an alkyl group, a substituted alkyl group, a cycloalkyl group, a substituted cycloalkyl group, an aralkyl group, a substituted aralkyl group, an aryl group, a substituted aryl group, a heterocyclic group or a substituted heterocylcic group; each of the benzene rings A and B may be independently condensed with another benzene ring, and the benzene rings A and B and their condensed rings may further have a substituent group; X is an anion; and n is 0 or 1.