| 摘要 |
<p>A compound represented by the general formula (I) (R1, R2, R4, and R5 each represents alkyl or aryl, or R1 and R2 and/or R4 and R5 may be bonded to each other to form a ring; R3 represents hydrogen or sulfo; R6, R7, R8, and R9 each represents hydrogen, halogeno, alkyl, alkoxy, amino, nitro, or cyano; X1 and X2 each represents alkyl or aryl; m1 to m3 each is 0 or 1; L1 to L7 each represents methine, provided that when two or more of the methines each has a substituent, then the substituents may be bonded to each other to form a ring; M represents hydrogen, a metal, or a quaternary ammonium salt; and n is an integer of 1 to 7 necessary for charge neutralization) or a salt of the compound. They are usable as a novel cyanine dye useful as an infrared-sensitive dye which exerts no adverse influence on the photographic properties of a photographic emulsion and is reduced in residual color after development.</p> |
