| 摘要 |
A symmetric cyanine of the formula: (see formula I) 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)n CH3, (CH2)n SO3- and (CH2)n SO3H, wherein n is an integer selected from 0 to 6 when R1 is (CH2)n CH3, and n is an integer selected from 3 to 6 when R1 is (CH2)n SO3- or (CH2)n SO3H; 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: (see formula II) (see formula I) wherein q is 0 or 1 and D is selected from the group consisting of: -C.ident.C-G; and (see formulas II, III, IV) 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.
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