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.