An ammonium persulfate mediated thiocyanation reaction of aldehyde‐derived hydrazones that affords 5‐thioxo‐1,2,4‐triazoliuminnersalts has been developed. The operational simplicity, mild and metal‐free reaction conditions performed at ambient temperature, wide functional group tolerance, and scalability of the process are key features of this method.
Optical recording medium using formazan metal complex dye and photo-stabilizing method
申请人:TDK Corporation
公开号:EP0729139A1
公开(公告)日:1996-08-28
A formazan metal complex dye is contained as a light absorbing dye in a recording layer to construct an optical recording medium. The formazan metal complex dye has high solubility and a relatively low thermal decomposition temperature and the recording medium exhibits high sensitivity, especially high recording sensitivity, and improved light resistance. The formazan metal complex dye can be used as a photo-stabilizer in an optical recording medium. The formazan metal complex dye is also effective for stabilizing conventional dyes against light.