Two applications of pressure tuning spectroscopy to characterize the triplet states of organic molecules and complexes in solid media

Pressure tuning spectroscopy is a general and powerful tool for studying the effects of atomic or molecular interaction on electronic phenomena-broadly defined. In this paper we present a review of two studies of pressure effects on the triplet state sf organic molecules in solid media. In the first study we demonstrate the effect of compression on the photophysics and photochemistry of representative aromatic carbonyls. There are dramatic increases in phosphorescence and fluorescence efficiencies as well as strong perturbations on the reactivity. In the second study we demonstrate the powerful effect of compression on inhibiting intracomplex motions of ligands for ruthenium organometallic complexes. This inhibition strongly effects the phosphorescence efficiency of the molecule.