A salt of a sulfonated dye modulates a stability of the dye, particularly its ozonefastness. The salt comprises an organic cation selected from the group consisting of:
a first organic cation having a positive charge delocalized between a nitrogen atom and at least one other heteroatom;
a second organic cation having a positive charge delocalized between a nitrogen atom and at least two other atoms; and
a third organic cation of formula (A):
wherein:
Rp, Rq and Rr are each independently selected from a C1-6 alkyl group;
s is 0, 1, 2 or 3; and
Ar is a C6-12 aryl group or C3-12 heteroaryl group.
A method of modulating a stability of a sulfonated dye, particularly its ozonefastness is provided. The method comprises providing a salt of the dye, wherein the salt comprises at least one organic cation selected from the group consisting of:
a first organic cation having a positive charge delocalized between a nitrogen atom and at least one other heteroatom;
a second organic cation having a positive charge delocalized between a nitrogen atom and at least two other atoms; and
a third organic cation of formula (A):
wherein:
Rp, Rq and Rr are each independently selected from a C1-6 alkyl group;
s is 0, 1, 2 or 3; and
Ar is a C6-12 aryl group or C3-12 heteroaryl group.
A salt of a sulfonated dye modulates a stability of the dye, particularly its ozonefastness. The salt comprises an organic cation selected from the group consisting of:
a first organic cation having a positive charge delocalized between a nitrogen atom and at least one other heteroatom;
a second organic cation having a positive charge delocalized between a nitrogen atom and at least two other atoms; and
a third organic cation of formula (A):
wherein:
R
p
, R
q
and R
r
are each independently selected from a C
1-6
alkyl group;
s is
0, 1, 2
or
3;
and
Ar is a C
6-12
aryl group or C
3-12
heteroaryl group.