Phthalocyanine compounds and optical recording media comprising them

摘要

A near infrared light-absorbing dye comprising phthalocyanine compounds represented by the following formula (2): (2) wherein in formula (2), M is two hydrogen atoms, a divalent metallic atom, a trivalent monosubstituted metallic atom, a tetravalent disubstituted metallic atom or an oxymetal atom, and L1, L2, L3 and L4 are each independently formula (a) or (b), (a) (b) in the formula (a) or (b), R1 and R3 are each a substituted or unsubstituted alkyl group, and R2 is a straight chain or branched halogenated alkyl or alkenyl group having 3 to 10 carbon atoms, X is a chlorine, bromine or iodine atom, and m is an integer of 1 to 12, provided that formula (2) represents a mixture of L1=L2=L3=L4=formula (a), L1=L2=L4=formula (a) and L3=formula (b), L1=L4=formula (a) and L2=L3=formula (b), L1=L3=formula (a) and L2=L4=formula (b), L1=formula (a) and L2=L3=L4=formula (b), and L1=L2=L3=L4=formula (b), and an optical recording medium comprising the phthalocyanine mixture.