Bis (indolestyryl) compound and high density recording media utilizing the same

A bis(indolestyryl) compound of the formula (I):

• wherein A and B are the same or different and are benzene, pyridone, or heterocyclic ring containing O, S, or N, R1 and R1′ are H, halogen, C1-5 alkyl, nitro, ester, carboxyl, sulfo, sulfonamide, amide, sulfo ester, C1-3 alkoxy, amino, C1-5 alkylamino, cyano, C1-6 alkylsulfonyl, or C2-7 alkoxy carbonyl, R2, R2′, R3, and R3′ are the same or different and are H, substituted or non-substituted C1-6 straight chain or branched alkyl, substituted or non-substituted C6-18 aryl, C2-6 straight chain or branched alkenyl, C3-6 cycloalkenyl, or substituted or non-substituted C3-6 cycloalkyl, R4 is H, C1-5 alkyl, hydroxyl, halogen, or C1-5 alkoxy, R5 and R5′ are the same or different and are H, halogen, C1-5 alkyl, nitro, C1-3 alkoxy, amino, cyano, C1-6 alkylsulfonyl, or C2-7 alkoxy carbonyl, W is oxygen, sulfur, selenium, —NR, or —C(CH3)2, n is 1˜18, and Z1 and Z2 are different and are an anion or an anionic organometallic complex with −1 or −2 valence, wherein R2 and R3 or R2′ and R3′ are joined together or with a benzene to form a ring, and R bonded to nitrogen is C1-4 alkyl.