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

An asymmetric bis(indolestyryl) compound having formula (I):

• wherein A and B are the same or different and comprise benzene, naphthalene, or heterocyclic ring containing O, S, or N, R1 and R1′ are H, halogen atoms, C1-5 alkyl, nitro, ester, carboxyl, sulfo, C1-3 alkoxy, amine, alkylamine, cyano, C1-6 alkylsulfonyl, or C2-7 alkoxy carbonyl, R2, R2′, R3, and R3′ are the same or different and comprise 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, or C3-6 cycloalkyl containing hetero atom, R4 is H, hydroxyl, halogen atoms, or alkoxy, R5 and R5′ are the same or different and comprise H, halogen atoms, C1-5 alkyl, nitro, C1-3 alkoxy, amine, cyano, C1-6 alkylsulfonyl, or C2-7 alkoxy carbonyl, n is 1˜18, Y is C(R6R7), C1-3 alkylamino or hetero atom, R6 and R7 are C1-3 alkyl, and Z− is an anion or an anionic organometallic complex, wherein when A=B, R1 is not equal to R1′ and when A≠B, R1 is equal to R1′ or not, and R2 and R3 or R2′ and R3′ are joined together or with a benzene to form a ring.