Nir dyes, methods of preparing them and their use

Details Nir dyes, methods of preparing them and their use Nir dyes, methods of preparing them and their use

C - Chemistry, Metallurgy

09

B

C09B 57/00 (2006.01) C09B 11/26 (2006.01) G11B 7/24 (2006.01) G11B 7/244 (2006.01)

Patent

CA 2081641

FM/6- 18832/A NIR dyes. methods of preparing them and their use Abstract of the disclosure The compounds of the formula I Image (I), in which Y and Yl are each, independently of one another, O, S, NH or N-alkyl, N-cycloalkyl, N-phenyl or N-benzyl, or Y and Yl are together N-alkylene-N, R and R1 are each, independently of one another, H, alkyl, cycloalkyl, aralkyl or aryl, R2 and R3 are each, independently of one another, H, or R2 forms, together with R6 and the N and C atoms linking them, a 5- or 6-membered ring and R3 is H, or R3 forms, together with R7 and the N and C atoms linking them, a 5- or 6-membered ring and R2 is H, R4 and R5 are each, independently of one another, H, or R4 forms, together with R8 and the N and C atoms linking them, a 5- or 6-membered ring and R5 is H, or R5 forms, together with R9 and the N and C atoms linking them, a 5- or 6-membered ring and R4 is H, R6, R7, R8 and R9 are each, independently of one another, H, alkyl, cycloalkyl, aralkyl or aryl, or R6 and R8 and/or R7 and R9 form, together with the N atom linking them, a piperidine radical, a morpholine radical or an unsubstituted piperazine radical or a piperazine radical substituted on the N atom by Cl-C4alkyl, hydroxyl-C1-C4alkyl or amino-C1-C4alkyl, Z is H or aryl and An? is an anion of a monobasic acid, the alkyl or cycloalkyl being unsubstituted or substituted by halogen, hydroxyl, Cl-C4alkoxy, cyano or phenyl, and the aryl or aralkyl being unsubstituted or substituted by halogen, hydroxyl, NH-alkyl, N(alkyl)2, Cl-C6alkyl, C1-C4alkoxy, carboxyl, alkoxycarbonyl, carbonamido, mono- or dialkylcarbonamido, nitro or CN, are suitable as light-absorbing substances in optical recording media.

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