| abstract |
The invention accordingly 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 (I) or a mesomeric or a tautomeric form thereof, wherein M 1 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; (III) and (IV)are each independently of the other (V), (VI) or (VII); (VIII) is (IX), (X), (XI), (XII), (XIII), or (XIV); (XV) is (XVI) or C 2-C8 heteroaryl unsubstituted or mono- or poly-substituted by R 10 , R 11 , R 12 and/or R 13 ; Q 1 is N or CR 18 , Q 2 is N or CR 19 , Q 3 , Q 5 and Q 7 are each independently of the other CR 20 R 21 , O, S or NR 22 , Q 4 is CR 16 or N and Q 6 is CR 17 or N; and R 2 and/or R 6 are O, S or NR 33 . Please see the disclosure for the other substituents which are less relevant. The compounds of formula (I) are novel and also claimed, as well as the compound of formula (II), or a mesomer or tautomer thereof, wherein R38 is halogen , CF 3 , NO 2 , CN, COR 22 , COOR 23 , SO 3 R 23 , NCO or SCN, G 1 , G 2 M 1 , R 1 R 2 , R 4 , R 5 , R 6 , R 8 , R 22 and R 23 are as defined in formula (I), M 2 m+ is a cation with m positive charges, and m is an integer 1, 2 or 3. The optical recording media are remarkably suitable for DVD±R (658 nm), especially at high recording speeds. |