Synthesis, thermochromic, solvatochromic and axial ligation studies of Zn-porphyrin complex

Abstract

In this study, the synthesis of a new zinc porphyrin hybrid (CNU-TJK) is reported. This novel metal porphyrin was characterized by 1H NMR, FT-IR, UV–Vis and HR-MS analysis. This porphyrin shows a strong solvatochromism that is reflected by its absorption and emission maxima in different solvents. The reversible thermochromic property of this dye was investigated at different temperatures by UV–Vis studies in toluene. The large thermochromic effect detected for the dye was attributed to pyridyl, phenyl and acetylene groups, whose association and dissociation dynamics in toluene lead to an absorption spectral change with temperature, accompanied by a change in color. The axial coordination studies also conducted and finally, DFT calculations were performed to rationalize the dye structures.