Organic Dye Molecules, The Quantitative Relationship Between Structure And Light Fastness,

Two different fading procedures were studied. One is the oxidation procedure on polyester fibers,the other is the reduction procedure on wool fibers.The study of oxidation procedure mainly focused on 11 disperse azo dyes and 11 disperse anthraquinone dyes. The study of reduction procedure mainly focused on 7 pyrazolone coupled acid azo dyes and 10 azo disperse dyes which has sulfonic group on the couple component.The QSPR study of these four kinds of dyes leads to the conclusion,which is shown as follow:The light fastness of disperse azo dye has the relation- ship with 7 independent factors :.the dipole moment ( u ),the frontier orbit energy(Ehomo,Elumo),the properties of C2 (E-C2,Ree-l-C2,Aen-l-C2),the most negative charge(q-). The equation revealing the relationship was founded.The light fastness of disperse anthraquinone dyes has the relationship with 7 independent factors:the properties of nitrogen atom on the a position (char-N,Ree-l-N,Aen-l-N),the frontier orbit energy(Ehomo,Elumo),the most negative charge(q+),the average polarization (a ).The equation revealing the relationship was founded.The light fastness of pyrazolone coupled acid azo dyes has the relationship with 5 independent factors:the NK N2 charge (E-N1 E-N2),the dipole moment (u ),the frontier orbit energy(Ehomo,Elumo). The equation revealing the relationship was founded.The light fastness of the azo disperse dyes which has sulfonic group on the couple component has the relationship with 5 independent factors:theN1 N2 charge (E-N1 E-N2),the dipole moment (u ),the frontier orbit energy(Ehomo,Elumo),the most positive and the most negative charge(q+ q-). The equation revealing the relationship was founded. The method of studying the metal complexed dyes was also found.