Temperature Dependence of Luminescent Properties of a Novel Rhodium(III) Crown-Porphyrinate in Polysterene Matrix

Abstract

In the interaction of tetra-15-crown-5-porphyrin (H2TCP) with rhodium(III) chloride in benzonitrile, the corresponding rhodium(III) porphyrinate (RhCl-TCP) containing a chloride ion as an axial anion in the Rh³⁺ cation coordination sphere was obtained and isolated. The structure of the obtained compound was determined based on the data of ¹H NMR spectroscopy, electronic absorption spectroscopy, and mass spectrometry. The luminescent characteristics of RhCl-TCP in a polymer matrix (polystyrene) were analyzed at temperatures of 298 and 77 K. It was found that the resulting complex can be considered as a luminescent sensor for temperature determination based on a change in the ratio of the phosphorescence and fluorescence intensities, as well as a change in the phosphorescence lifetime with temperature changing.