Abstract
Several aromatic hydrocarbons are complexed with trinitrobenzene (TNB) and trinitrofluorenone (TNF) in the crystalline state and subjected to increasing pressures (0-30 kbar). The charge transfer absorption shows a ∼1200 cm−1 red shift, while the fluorescence red shift may vary between 200-1700 cm−1 at 25 kbar. In the same complexes the Stokes shift decreases at higher pressures. This decrease can be understood in terms of charge-transfer forces and potential energy curves appropriate for weak EDA complexes.