Cyanine dye having reduced visible absorption
The present invention provides an IR-absorbing macrocyclic cyanine dye, wherein said dye comprises at least one moiety for reducing intermolecular interactions, thereby minimizing absorption of visible light. Dyes of this type are especially suitable for use in netpage and Hyperlabel systems.
1. An IR-absorbing dye which is a metal-ligand complex of formula (I) or a compound of formula (II):
wherein
Q 1 , Q 2 , Q 3 and Q 4 are the same or different and are independently selected from a C 3-20 arylene group or a C 3-20 heteroarylene group, said C 3-20 arylene or
C 3-20 heteroarylene group including at least one three-dimensional C 6-30 hydrocarbyl or C 6-30 hydrocarbylene group;
M is selected from Si(A 1 )(A 2 ), Ge(A 1 )(A 2 ), Ga(A 1 ), Mg, Al(A 1 ), TiO, Ti(A 1 )(A 2 ), ZrO, Zr(A 1 )(A 2 ), VO, V(A 1 )(A 2 ), Mn, Mn(A 1 ), Fe, Fe(A 1 ), Co, Ni, Cu, Zn, Sn, Sn(A 1 )(A 2 ), Pb, Pb(A 1 )(A 2 ), Pd and Pt;
A 1 and A 2 are axial ligands, which may be the same or different, and are selected from —OH, halogen and
—OR 3 ;
R 3 is a selected from C 1-12 alkyl, C 5-12 aryl, C 5-12 arylalkyl or Si(R x )(R y )(R z ); and
R x , R y and R z may be the same or different and are selected from C 1-12 alkyl, C 5-12 aryl, C 5-12 arylalkyl, C 1-12 alkoxy, C 5-12 aryloxy or C 5-12 arylalkoxy.
2. The dye of claim 1 , wherein Q 1 , Q 2 , Q 3 and Q 4 are the same.
3. The dye of claim 1 , wherein said three-dimensional C 6-30 hydrocarbyl or C 6-30 hydrocarbylene group is a bridged cyclic group.
4. The dye of claim 1 , wherein Q 1 , Q 2 , Q 3 and Q 4 are selected from an arylene or heteroarylene group of the formula:
wherein
R 1 and R 2 may be the same or different and are selected from hydrogen, hydroxyl, C 1-12 alkyl, C 1-12 alkyl bearing a hydrophilic or hydrophilizable group, C 1-12 alkoxy, C 1-12 alkoxy bearing a hydrophilic or hydrophilizable group, amino, C 1-12 alkylamino, di(C 1-12 alkyl)amino, halogen, cyano, thiol, C 1-12 alkylthio, nitro, carboxy, C 1-12 alkylcarbonyl, C 1-12 alkoxycarbonyl, C 1-12 alkylcarbonyloxy or C 1-12 alkylcarbonylamino;
T is a C 3-30 hydrocarbyl group having three-dimensional structure;
W is —SO 3 H or a water-soluble salt thereof;
E is selected from —OH, —O − , C 1-6 alkyl, carboxy-C 1-6 alkyl, sulfo-C 1-6 alkyl, C 1-6 alkoxy, C 5-12 arylalkyl, C 1-6 alkylcarbonyl, C 5-12 arylalkylcarbonyl, C 1-6 alkoxycarbonyl or C 5-12 arylalkoxycarbonyl;
m is 0, 1 or 2;
n is 1 or 2; and
p is 0, 1 or 2.
5. The dye of claim 4 , wherein R 1 and R 2 are selected from hydrogen or C 1-8 alkoxy.