| abstract |
Optical recording medium suitable for optical recording with a laser of wavelength from 350 to 500 nm, especially about 405 nm, wherein the recording track comprises a compound of formula [(L1)M1(L2)]m- Z1+ (I), or a mesomeric or tautomeric form thereof, wherein L1 and L2 independently of one another are divalent, heterocyclic azo ligands of the formula (I) M1 is a metal cation in the oxidation state +3, a hydroxy or halogeno metal group wherein the metal is in the oxidation state +4, or an oxo metal group wherein the metal is in the oxidation state +5; m is 1 ; n is an integer 1 , 2 or 3; and Z1 is a cation of the formula (a), (b) or (c). |