A New Tetrafluorene-Substituted Copper(II) Porphyrinate as a Promising Phosphorescent Temperature Sensor

A new tetrafluorene-substituted copper(II) porphyrinate (CuTFP) with intense phosphorescent glow in the red spectral region is obtained. It is found that the phosphorescence lifetime of CuTFP in a polystyrene matrix changes significantly when the sample is cooled (5 μs at 25°C and 344 μs at–196°C), while the intensity of phosphorescence in the same temperature range changes only 8.1-fold. The dependence of variation of the CuTFP lifetime in polystyrene on the temperature is analyzed. It is found that the lifetime changes little at positive temperatures centigrade, while lifetime variation in the negative temperature range is very significant, which allows considering the new material as a promising phosphorescent sensor for measurement of low temperatures, e.g., under Arctic conditions.