Supramolecular associates of double-decker lanthanide phthalocyanines with macromolecular structures and nanoparticles as the basis of biosensor devices

The electronic-spectroscopy technique is used to study the properties of solutions of double-decker diphthalocyanine complexes of lanthanides LnPc2 (Ln = Ho, Er, Yb, Lu) in chloroform, dimethylformamide, water-micellar systems, solutions of proteins, and polymers, as well as on the surface of silica nanoparticles. In all the studied systems, a correlation is established between the positions of maxima of absorption bands of LnPc2 and the ionic radius of the complexing metal. Redox processes determined by the nature of the solubilizer are detected in supramolecular associates of LnPc2 with macrocompounds and nanoparticles. Finally, prototypes of sensor systems are suggested for determination of albumin and silica nanoparticles in solutions. Films of polyvinyl pyrrolidone and polyvinyl alcohol containing LuPc2 and YbPc2 are obtained, for which sensor response to albumin and nanosilica is also established. On the whole, the results show good prospects for development of sensor devices based on the studied systems.