双齿配位体金属络合物近红外吸收染料的合成

Synthesis of near-infrared absorbing metal complex dyes with bidentate indoaniline-type ligands

８－羟基喹啉或８－羟基喹哪啶与４－Ｎ，Ｎ－二烷氨基笨胺在有氧化剂存在下发生氧化缩合反应，生成了吲苯胺型双齿配位体。用所合成的配位体与金属离子络合生成了４８种稳定的吲哚苯胺型双齿配位体金属络合物；金属络合物的最高吸收值比络合前配位体有很大的红移，摩尔消光系数也有很大的增加，该系列吲哚苯胺型双齿配位体金属络合物近红外吸收染料的值在７５０～８３０ｎｍ的范围内，摩尔消光系数很高，一般的。它们在有机溶剂中有良好的溶解性，是一类具有良好性质的近红外吸收染料。

bidentate indoaniline- type ligands were synthesized by condensing 8- hydroxyquinoline or 8- hydroxyquinaldine with p-dialkylaminoaniline hydrochlorides in thepresence of an oxidizing agent Na_2S_2O_8.On the basis of the above mentioned ligands 48 metalcomplex dyes with bidentate indoaniline-type ligands have been synthesized,which have intenseabsorption bands in the near infrared region and are isolated as stable compounds. The formationof metal complexes causes a large bathochromic shift of the absorption band and an increase in themolar extinction coefficient compared with the free ligands.The change of the substituents suchas methyl,halogen residue can affect the absorption bands and the molar extinction coeffieient ofthe metal complex as well.It is worth noting, in view of the application in the field of opticalstorage technology,most of these complexes absorb near infrared light at 750～810 nm and haveintense absorption band()in the near-infrared region. They have good properties asnear-infrared absorbing dyes.