Anisotropy and Spectroscopic Properties of the Complexes of meso-Tetra(4-Carboxyphenyl)Porphyrin Molecules with Diamond Nanoparticles

The complexes of meso-tetra(4-carboxyphenyl)porphyrin with nanoscale diamonds were studied by spectroscopic methods. The polarization characteristics of their steady-state fluorescence indicate the formation of a covalently bound complex between porphyrin molecules and diamond nanoparticles. Using the data of steady-state fluorescence anisotropy, the hydrodynamic volumes of the studied complexes were estimated. The measurements showed that the photophysical properties of porphyrin barely change upon the formation of an organic–inorganic hybrid complex with nanodiamonds. The studied complexes can be promising in the field of biomedical research, in particular, in diagnosing and developing a new generation of photosensitizers for practical medicine.