Three new donor-acceptor systems, synthesized by axial coordination of 1-N-methyl-2-(pyridin-4-yl)-3,4-fullero[60]pyrrolidine (PyC60)/2,5-di-(pyridin-2-yl)-3,4-fullero[70]pyrrolidine (Py2C70) and mesotetra(4-pyridyl)porphyrinato)gold(III) chloride (ClAuP) with (meso-tetra(4-octyloxyphenyl)porphyrinato)cobalt(II) (CoP) were observed. In order to optimize the reaction conditions, the formation mechanism and composition of the complexes dependent on the structure of axial molecular ligand were explored. The triad, (PyC60)(2)CoP/(Py2C70)(2)CoP, and dyad, (ClAuP)CoP, were formed respectively in the two-stage and one-stage process. The confirmation of their chemical structure and determination of stability constants was performed using the UV-vis, IR, H-1 NMR, MS (MALDI-TOF) spectrometry and chemical thermodynamics/kinetics, respectively. Photoelectrochemical studies of the porphyrinfullerene/porphyrin-porphyrin systems were carried out compared with corresponding precursors by the amperometry methods. The high values of the photocurrent density and incident photon energy conversion to current (IPCE365nm) of the titanium electrode modified by (PyC60)(2)CoP/(Py2C70)(2)CoP/(ClAuP) CoP were demonstrated, which points to good perspectives in the application of the coordination complexes synthesized as a photoactive molecular material for solar cells.
