Spectral features of interaction of hemin and zinc porphyrin with sodium hexamolybdenicelate

The interaction of hemin and the Zn(II)-complex of tetra(4-pyridyl)porphyrin (ZnTPP) with hexamolybdenonickelate anions in an aqueous medium has been studied by electron absorption spectroscopy and spectrofluorimetry. Differences in spectral behavior of two metal porphyrins when interacting with heteropoly compounds are associated with differences in the structure of these porphyrins. Both the transformation of the porphyrins characteristic bands is manifested, and new bands are found in the electron absorption spectra that indicates the formation of hybrid organo-inorganic complexes. In addition, fluorescence quenching of ZnTPP, predominantly of the static type, is observed, which also testifies the formation of hybrid complexes. The binding ability of the ZnTPP system - crystalline hydrate of sodium hexamolibdenonicelate (HMN) was evaluated, as well as the stability of the obtained hybrid complex. The results of the study will be useful when creating hybrid complexes by molecular design in order to further incorporate them into various biomedical applications.