A symmetric cyanine of the formula:
wherein:
X is selected from the group consisting of O, S and C(CH3)2;
W represents non-metal atoms required to form a benzo-condensed or a naphto-condensed ring;
R1 is selected from the group consisting of (CH2)nCH3, (CH2)nSO3- and (CH2)nSO3H, wherein n is an integer selected from 0 to 6 when R1 is (CH2)nCH3, and n is an integer selected from 3 to 6 when R1 is (CH2)nSO3- or (CH2)nSO3H;
R2 and R3 are independently selected from the group consisting of H, a sulphonic moiety and a sulphonate moiety;
Q is selected from the group consisting of:
wherein q is 0 or 1 and D is selected from the group consisting of:
-C≡C-G;
and
wherein A is O or S and G is, or contains a N, O or S nucleophile moiety or is, or contains a moiety capable of reacting with N, O or S nucleophiles.
公式为:其中:X从O、S和C(
CH3)2组成的组中选择;W代表形成苯并或
萘并环所需的非
金属原子;R1从(
CH2)n 、( )nSO3-和( )nSO3H组成的组中选择,其中当R1为( )n 时,n是从0到6选择的整数,当R1为( )nSO3-或( )nSO3H时,n是从3到6选择的整数;R2和R3独立地从H、
磺酸基团和
磺酸盐基团组成的组中选择;Q从以下组成的组中选择:其中q为0或1,D从以下组成的组中选择:-C≡C-G;其中A为O或S,G是或含有N、O或S亲核基团,或是或含有能与N、O或S亲核基团发生反应的基团。