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

1. 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 (2):

wherein R 11 , R 12 , R 13 and R 14 each independently represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group, R 21 , R 22 and R 3 each independently represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heterocyclic group, a halogen atom, a carboxyl group, a substituted or unsubstituted alkoxycarbonyl group, a cyano group, a substituted or unsubstituted acyl group, a substituted or unsubstituted carbamoyl group, an amino group, a substituted amino group, a sulfo group, a hydroxyl group, a nitro group, a substituted or unsubstituted alkylsulfonylamino group, a substituted or unsubstituted arylsulfonylamino group, a substituted or unsubstituted carbamoylamino group, a substituted or unsubstituted alkylsulfonyl group, a substituted or unsubstituted arylsulfonyl group, a substituted or unsubstituted alkylsulfinyl group, a substituted or unsubstituted arylsulfinyl group or a substituted or unsubstituted sulfamoyl group, m represents an integer of 0 or more, R 3 s may be the same or different when m is 2 or more, Z x+ represents a cation, and x represents an integer of 1 or more.

2. An optical information-recording medium as described in claim 1 , having a thickness of 1,2±0.2 mm and comprising two laminates each containing a recording layer including the dye, in which the two laminates are bonded 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 in thickness; and

the recording layer provided on the pregroove-formed side of the transparent disk-shape substrate.

3. A method of recording information comprising recording information on an optical information-recording medium as described in claim 2 by irradiation with laser light having a wavelength of 600 to 700 nm.

4. An optical information-recording medium as described in claim 1 , having a thickness of 1.2±0.2 mm,

the optical information-recording medium comprising:

a laminate containing a recording layer including the dye; and

a disk-shape protective plate;

in which the laminate and the disk-shape protective plate are bonded each other so that the recording layer is inside,

wherein the laminate 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 in thickness; and

the recording layer provided on the pregroove-formed side of the transparent disk-shape substrate.

5. A method of recording information comprising recording information on an optical information-recording medium as described in claim 4 by irradiation with laser light having a wavelength of 600 to 700 nm.

6. A method of recording information comprising recording information on an optical information-recording medium as described in claim 1 by irradiation with laser light having a wavelength of 600 to 700 nm.

7. An oxonol compound represented by the following formula (2):

wherein R 11 , R 12 , R 13 and R 14 each independently represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group, R 21 , R 22 and R 3 each independently represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heterocyclic group, a halogen atom, a carboxyl group, a substituted or unsubstituted alkoxycarbonyl group, a cyano group, a substituted or unsubstituted acyl group, a substituted or unsubstituted carbamoyl group, an amino group, a substituted amino group, a sulfo group, a hydroxyl group, a nitro group, a substituted or unsubstituted alkylsulfonylamino group, a substituted or unsubstituted arylsulfonylamino group, a substituted or unsubstituted carbamoylamino group, a substituted or unsubstituted alkylsulfonyl group, a substituted or unsubstituted arylsulfonyl group, a substituted or unsubstituted alkylsulfinyl group, a substituted or unsubstituted arylsulfinyl group or a substituted or unsubstituted sulfamoyl group, m represents an integer of 0 or more, R 3 s may be the same or different when m is 2 or more, Z x+ represents a cation, and x represents an integer of 1 or more.