某些新的含醛基和二氰基乙烯的偶氮染料的合成和可见光谱

The Synthesis and Visible Spectra of Some Novel Azo Dyes Containing Aldehyde and Dicyanomethylidene Groups

红外染料可用于光学记录和光学数据储存,因此它是近年来发展的高技术领域之一。但是目前能应用的红外染料非常少,且绝大部份是菁染料。最近有人报道了醌型和偶氮型红外染料的合成。所谓红外染料是指λ_(man)在700nm以上的分子,含一个发色团体系往往是不够的。

A variety of new azo dyes containing conjugated aromatic aldehyde group (2)were prepared. Condensation of 2 with malononitrile afferded the corresponding dicyano-methylidene derivatives (3). Moreover, their visible absorption spectra were examined. Itwas found that: (1) The bathochromic shifts were caused by the candensation of 2 withmalonitrile. thus λ_(max)^(EtOⅡ) of 3b shifted toward the long wavelength about 46 nm in comparisonwith 2b. (2) The dyes containing amino groups caused red shift in acid solvent, while thosecontaining hydroxy groups caused red shift in basic solvent.