| abstract |
The invention relates to an optical recording medium comprising a substrate, a reflecting layer and a recording layer, wherein the recording layer comprises a compound of formula n n npreferably a compound of formula n nor a mesomeric or tautomeric form thereof, wherein n nA h+ is an organic cation having h quaternary ammonium or phosphonium groups; n n nQ 1 is N or CR 15 , Q 2 is N or CR 16 , Q 3 , Q 5 and Q 7 are each independently of the other CR 17 R 18 , O, S or NR 19 , Q 4 is CR 13 or N and Q 6 is CR 14 or N; and one of R 1 and R 3 is OR 17 , OR 20 , SR 17 , SR 20 , NR 17 R 18 , NR 18 R 20 or NR 20 R 21 , and the other of R 1 and R 3 is O − , S − or N − R 22 . nThe compounds of formula (I) and (II) are novel and also claimed, as well as mixtures thereof with metal complexes. The optical recording media are remarkably suitable for DVD±R (658 nm), especially at high recording speeds. |