Metal-cyanine dye having improved water solubility
AssigneeSilverbrook Research Pty Ltd
InventorsSimone Charlotte Vonwiller, Scott Matthew Starling, Damon Donald Ridley, Lachlan Everett Hall, Simon Fielder, Maxine Sintic, Sutharsiny Indusegaram, Kia Silverbrook, Paul Lapstun
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Abstract
The present invention provides an IR-absorbing metal-cyanine dye, in which the metal has at least one axial ligand bound thereto, and wherein the axial ligand comprises a hydrophilic or hydrophilizable moiety. Dyes of this type are especially suitable for use in netpage and Hyperlabel systems.
Claims11
An IR-absorbing dye which is a metal-cyanine complex of formula (I):
- wherein
- Q1, Q2, Q3 and Q4 are the same or different and are independently selected from a C3-20 arylene group or a C3-20 heteroarylene group;
- M is selected from Ti(A1)(A2), Zr(A1)(A2), V(A1)(A2), Si(A1)(A2), Ge(A1)(A2), Ga(A1), Al(A1), Mn(A1), Fe(A1), Sn(A1)(A2), or Pb(A1)(A2);
- and
- A1 and A2 may be the same or different and are axial ligands of formula (IIIa)
- wherein:
- C1 represents a core unit having two or more branching position;
- each P1 is independently selected from H, a hydrophilic moiety or a branched moiety;
- g1 is an integer from 2 to 8;
- q1 is 0 or an integer from 1 to 6;
- and
- each p1 is independently selected from 0 or an integer from 1 to 6.
The dye of claim 1, wherein A1 and/or A2 is a pentaerythritol derivative (A), a triethanolamine derivative (B), a phloroglucinol derivative (C), or a 3,5-dihydroxybenzyl alcohol derivative (D):
- wherein is P1 is as defined in claim 8.
Dependencies are inferred from the claim text.