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US 7,094,910 B2Granted
Bridged diarylpolymethine chromophores
AssigneeSilverbrook Research Pty Ltd
InventorsLachlan Everett Hall, Kia Silverbrook
Life of this patent
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Abstract
An infrared dye, characterised in that the dye comprises two bridged diarylpolymethine type dyes or derivatives thereof connected together at either the 3, 4, 5 or 6 position by a central moiety such that the two dyes are located on each side of the central moiety, wherein the infrared dye absorbs strongly in the near infrared region of the spectrum but poorly in the visible region of the spectrum.
Claims5
An infrared dye of formula 4 as set out hereunder:
- wherein X1 and X2 are individually selected from the group consisting of oxygen and sulfur;
- Z1 and Z2 are individually selected from CR3 where R3 is selected from the group R;
- Y is independently ═O or a tautomer thereof or dimethyl;
- Q1, Q2, Q3 and Q4 are individually selected from the group consisting of R4, a fused 6-membered aromatic ring optionally substituted with 1 to 4 substituents individually selected from R5, and fused polyaromatic rings optionally substituted with one or more substituents selected from R6 wherein R4, R5 and R6 are individually selected from the group R;
- R is the group consisting of hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aralkyl group, a halide atom, a hydroxy group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkoxy group;
- and
- n is 1 or 2 or 3.
4 more elements
Dependencies are inferred from the claim text.