Optical information-recording medium, novel oxonol compound and method of recording information

Abstract

An optical information-recording medium which contains a dye having at least two chromophores bonded to each other without any conjugated bond intervening between those chromophores.

1 - 17 . (canceled)  
     
     
         18 . An optical information-recording medium, comprising a dye having at least two chromophores bonded to each other without any conjugated bond intervening between said chromophores, 
 wherein the dye is represented by the following formula (1):                          wherein Dye 11 , Dye 12  and Dye 2k  each independently represents a dye residue having a chromophore, L 11  and L 2K  each independently represent a divalent linkage group forming no π-conjugated system between chromophores linked thereby, n represents an integer of 0 to 10, k represents all integers in the 0 to n range, Q represents an ion neutralizing electric charge, and y is a number required for neutralization of electric charge, and    wherein the chromophores forming dye residues represented by Dye 11 , Dye 12  and Dye 2K  are cyanine dyes represented by the following formula (3) or merocyanine dyes represented by the following formula (4):                          wherein Za 1  and Za 2  each represent atoms forming a 5- or 6-membered nitrogen-containing heterocyclic ring which may further be fused together with a benzene ring, a benzofuran ring, a pyridine ring, a pyrrole ring, an indole ring or a thiophene ring; Ra 1  and Ra 2  each represent any of a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aryl group and a substituted or unsubstituted heterocyclic group; Ma 1  to Ma 7  each independently represent a methine group which may have a substituent; na 1  and na 2  each represent 0 or 1 independently; ka 1  represents an integer of 0 to 3, and when Ka 1  is 2 or 3, Ma 3 s and Ma 4 s maybe the same or different; Q represents an ion neutralizing electric charge; and y is a number required for neutralization of electric charge; the dye residue formed by removing a hydrogen atom from any of Za 1 , Za 2 , Ra 1 , Ra 2  and Ma 1  to Ma 7  in formula (3) is chosen as a dye residue in formula (1) and enter into combination with the linkage group L 11  or L 2K  in formula (1), and                          wherein Za 3  represents atoms forming a 5- or 6-membered nitrogen-containing heterocyclic ring which may further be fused together with a benzene ring, a benzofuran ring, a pyridine ring, a pyrrole ring, an indole ring or a thiophene ring; Za 4  represents atoms forming an acidic nucleus; Ra 3  represents any of a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aryl group and a substituted or unsubstituted heterocyclic group; Ma 8  to Ma 11  each represent a methine group independently; na 3  is 0 or 1; ka 2  represents an integer of 0 to 3, and when ka 2  is 2 or 3, Ma 10 s and Ma 11 s maybe the same or different; Q represents an ion neutralizing electric charge; and y is a number required for neutralization of electric charge; the dye residue formed by removing a hydrogen atom from any of Za 3 , Za 4 , Ra 3  and Ma 8  to Ma 11  in formula (4) is chosen as a dye residue in formula (1) and enter into combination with the linkage group L 11  or L 2k  in formula (1).    
     
     
         19 . An optical information-recording medium, comprising a dye having at least two chromophores bonded to each other without any conjugated bond intervening between said chromophores, 
 wherein the dye is represented by the following formula (1):                          wherein Dye 11 , Dye 12  and Dye 2K  each independently represents a dye residue having a chromophore L 11  and L 2k  each independently represent a divalent linkage group forming no π-conjugated system between chromophores linked thereby, n represents an integer of 0 to 2, k represents all integers in the 0 to n range, Q represents an ion neutralizing electric charge, and y is a number required for neutralization of electric charge.    
     
     
         20 . An optical information-recording medium, comprising a dye having at least two chromophores bonded to each other without any conjugated bond intervening between said chromophores, with the proviso that the dye is not a polymer.  
     
     
         21 . An optical information-recording medium to be irradiated with laser light having a wavelength of 600 to 700 nm, the medium comprising a dye having at least two chromophores bonded to each other without any conjugated bond intervening between said chromophores, 
 wherein the optical information-recording medium has a thickness of 1.2±0.2 mm and comprises two laminates each containing a recording layer including the dye, in which the two laminates are bonded to each other so that each of the recording layers is inside,    wherein each of the laminates includes:    a transparent disk-shape substrate having a pregroove formed with a track pitch of 0.6 to 0.9 μm and measuring one of 120±3 mm and 80±3 mm in diameter and 0.6±0.1 mm n thickness; and    the recording layer provided on the pregroove-formed side of the transparent disk-shape substrate.