申请人:Kunimoto Kazuhiko
公开号:US20080095967A1
公开(公告)日:2008-04-24
The invention relates to new compounds of formula (I), (II), (III) or (IV) and their use in the recording layer of an optical recording medium comprising a substrate, a recording layer and optionally one or more reflecting layers. The instant compounds are of formula (I), (II), (III) or (IV) or tautomers thereof, wherein G1 and G2 are each independently of the other formula (V), (VI), (VII), (VIII), (IX), (X), (XI), X
1
and X
2
are each independently from the other a direct bond or a chain consisting of from 1 to 8 members each selected independently from the group consisting of CR
12
═CR
13
, C═CR
12
R
13
, CR
12
R
13
, C═O, C═S, C═N(R
14
), N(R
14
), O or S, preferably a direct bond or a chain consisting of 1, 2, 3 or 4 members, most preferred a direct bond or a chain CR
12
R
13
, C═O, C═S, C═N(R
14
), N(R
14
), O or S; A
1
, A
2
and A
3
are CR
15
R
16
, formula (a), N(R
14
), O, S, Se, N═C(R
18
) or CR
19
═CR
20
, and A
4
is O, S or Se; M
1
is a transition metal of groups 9 to 12, preferably Co, Cu, Ni, Pd or Zn, especially Co, Cu or Ni, or is SiR
21
R
22
, GeR
21
R
2
2, PR
21
R
22
or AIR
21
; and Q
1
and Q
2
are each independently of the other C(R
23
), N or P. For the detailed definitions of the further substituents, see the description. Recording and playback are effected especially at a wavelength of from 350 to 500 nm, for example using a blue laser. The recording and playback quality is excellent and allows a high storage density.