Patent ID: 6750346
Filing Date: 2004-06-15
Classification: C09B,C12Q,G01N

Abstract:
Laser-compatible NIR marker dyes based on polymethines of the general formula I, II or III wherein R1 to R14 are equal or different and are present in each case hydrogen, chlorine, bromine, an aliphatic or mononuclear aromatic group, each having at most 12 carbon atoms which may contain as a substituted group in addition to carbon and hydrogen, up to 4 oxygen atoms and zero, one or two nitrogen atoms or a sulfur atom or a sulfur and a nitrogen atom or represent an amino function, having a nitrogen atom to which there is bound, hydrogen or at least one substituent having up to 8 carbon atoms, said substituent selected from the group consisting of carbon, hydrogen and up to two sulfonic acid groups.