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): 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 L<1>, L<2>, L<3> and L<4> are each independently formula (a) or (b), in the formula (a) or (b), R<1> and R<3> are each a substituted or unsubstituted alkyl group, and R<2> 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 L<1> = L<2> = L<3>= L<4> = formula (a), L<1> = L<2> = L<4> = formula (a) and L<3> = formula (b), L<1> = L<4> = formula (a) and L<2> = L<3> = formula (b), L<1> = L<3> = formula (a) and L<2> = L<4> = formula (b), L<1> = formula (a) and L<2> = L<3> = L<4> = formula (b), and L<1> = L<2> = L<3> = L<4> = formula (b), and an optical recording medium comprising the phthalocyanine mixture.