| abstract |
The invention relates to novel optical recording media containing certain novel metal chelates and having excellent recording and reproducing quality especially at a wavelength of 300 to 500 nm.n n n Compounds of the formula M m + (X n ) x (L 1 ) (L 2 ) y (L 3 ) z (I) in which L 1 and L 2 are each independently of one another used for a ligand of the formula (II), where L 1 and L 2 can be bonded to one another via a direct bond or a bridge with C 2 -C 10 alkylene or C 2 -C 10 alkenylene between two radicals L 1 and L 2 ; L 3 is independently of L 1 and L 2 is another ligand of the formula (II); M is a transition metal of groups 6 to 12 or a group 13 element which is bonded to at least one of R 1 , R 2 , R 3 and R 4 and may additionally be coordinated with one or more further ligands and / or optionally Balancing an excess charge with one or more other ions within or outside the coordination sphere can have an electrostatic interaction; m is a number 1, 2 or 3; n is a charge -2, -1, +1 or +2; p is a number 1 or 2; q, x, y and z independently represent a number 0 or 1, with the proviso that the sum of the charges of M m + , (X n ) x , (L 1 ), (L 2 ) y and (L 3 ) z is 0; Q 1 is CR 6 R 7 , Q 2 is CR 8 R 9 , N-OR 8 , N-NR 8 R 9 , O, S or NR 8 , and Q 3 is CR 10 R = = stand 11, C O, S O, O = S = O or P (O) R 12; and M is complexed to at least one of R 1 , R 2 , R 3 and R 4 .n n n For the exact definitions of R 1 to R 27 , reference is made to the description.n n n Also claimed are the novel compounds of the formula (I) and their use for the technical improvement of optical recording media. |