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    • 1. 发明公开
    • NEW INFRARED ABSORBERS
    • EP4428201A1
    • 2024-09-11
    • EP23160446.3
    • 2023-03-07
    • European Central Bank
    • Loccufier, JohanLouwet, Jos
    • C09B23/01C09B23/10
    • C09B23/0066C09B23/107
    • A near infrared dye having a chemical structure according to Formula I,

      wherein
      A1 and A2 independently from each other represent an optionally annulated five membered heterocycle;
      R1 and R4 are independently from each other selected from the group consisting of a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted alkaryl group and a substituted or unsubstituted aryl or heteroaryl group;
      n and m independently from each other represent 0 or 1;
      L1 and L2 independently from each other represent a divalent linking group comprising no more than 14 carbon atoms and coupled to a carbon atom of respectively A1 and A2;
      B represent a nitrogen containing functional group;
      R2 and R3 are independently from each other selected from the group consisting of a hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted alkaryl group and a substituted or unsubstituted aryl or hetero-aryl group;
      R2 and R3 together may represent the necessary atoms to form a five to eight membered ring.