Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1997-10-20
1999-01-05
Lambkin, Deborah C.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
546187, 544109, 544145, 4302701, 430372, 430517, C07D32700, C07D40100, C07D29500, G03C 1492
Patent
active
058565205
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/JP97/00858 Mar. 17, 1997.
TECHNICAL FIELD
The present invention relates to a metal complex, more particularly, to a substituted benzenedithiol metal complex.
BACKGROUND ART
Indolenine cyanine dyes which are excellent in heat resistance and water resistance are advantageously used as optical data recording media constituting recording layers of various optical recording disks (see, for example, Japanese Unexamined Patent Publication No. 59-24692 (1984)). However, the indolenine cyanine dyes are liable to cause data reproduction deterioration due to repeated light irradiation for data reproduction and to cause photo-deterioration during storage in light and, hence, it is difficult to keep a recording layer employing such an indolenine cyanine dye stable during a prolonged use. Therefore, where an indolenine cyanine dye is used to form a recording layer, a metal complex capable of functioning as a singlet oxygen quencher is mixed with the indolenine cyanine dye, and a coating solution prepared by dissolving the mixture in a solvent is applied onto a resin substrate of an optical recording disk for the formation of the recording layer (see, for example, Japanese Unexamined Patent Publication No. 59-55794 (1984)).
If such a metal complex is capable of functioning not only as a singlet oxygen quencher but also as an optical data recording medium per se, the metal complex would be expected to have an enhanced usefulness. For example, a recording layer of an optical recording disk can be formed of the metal complex alone without the use of the indolenine cyanine dye.
It is therefore an object of the present invention to provide a novel metal complex which is capable of functioning not only as a singlet oxygen quencher but also as an optical data recording medium per se.
DISCLOSURE OF THE INVENTION
A substituted benzenedithiol metal complex according to the present invention is represented by the following general formula (1): ##STR5##
In the general formula (1), M is a transition metal, A.sup.+ is a quaternary ammonium group, and R is an organic group selected from the group consisting of groups represented by the following formulae (i), (ii), (iii) and (iv): ##STR6## (wherein R.sup.1 is an alkyl group having 1 to 4 carbon atoms), ##STR7## (wherein n is 3, 4 or 5), ##STR8## (wherein R.sup.2 is one of a hydrogen atom and a substituent having 1 to 4 carbon atoms).
Specific examples of the substituted benzenedithiol metal complex include a 4-N,N-diethylsulfamoyl-1,2-benzenedithiol metal complex represented by the following general formula (1-a), a 4-piperidylsulfonyl-1,2-benzenedithiol metal complex represented by the following general formula (1-b), a 4-morpholinosulfonyl-1,2-benzenedithiol metal complex represented by the following general formula (1-c), and a 4-phenylsulfonyl-1,2-benzenedithiol metal complex represented by the following general formula (1-d). ##STR9##
In the general formulae (1-a), (1-b), (1-c) and (1-d), M and A.sup.+ are the same as in the general formula (1).
A preparation process for the substituted benzenedithiol metal complex represented by the general formula (1) in accordance with the present invention includes the following steps:
.circleincircle. Reacting 3,4-dibromobenzenesulfonyl chloride with a compound selected from the group consisting of compounds represented by the following general formulae (a), (b), (c) and (d) to synthesize 4-substituted sulfonyl-1,2-dibromobenzene represented by the following general formula (2): ##STR10## wherein R.sup.1, n and R.sup.2 are the same as in the general formula (i), (ii) and (iv), ##STR11## wherein R is the same as in the general formula (1);
.circleincircle. Converting the 4-substituted sulfonyl-1,2-dibromobenzene into a 4-substituted sulfonyl-1,2-benzenedithiol represented by the following general formula (3): ##STR12## wherein R is the same as in the general formula (2); and
.circleincircle. Reacting the 4-substituted sulfonyl-1,2-benzenedithiol with a transition metal salt and a quaternary ammonium sa
REFERENCES:
patent: 5512416 (1996-04-01), Namba et al.
Hirako Kazuyoshi
Kimura Satoshi
Suzuki Michio
Lambkin Deborah C.
Sumitomo Seika Chemicals Co. Ltd.
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