Acid/base induced linkage isomerization of alizarin red adsorbed onto nano-porous TiO2 surfaces

Diffuse reflectance FTIR studies indicate that alizarin red (1,2-dihydroxy-9-10-anthraquinone sulfonic acid) undergoes reversible acid/base induced linkage isomerization on nano-porous TiO2 surfaces. It is also possible to convert molecules from surface orientation, ARS-(TiO2-1,9) to the ARS-(TiO2-1,2) by thermal activation.