Systems formed by the pyrene derivatives 3-hydroxypyrene and 1-aminopyrene with pyridine,ere studied. The thermodynamic and kinetic parameters of the systems were calculated using the changes in the absorption and emission spectra which occur due to hydrogen bond or complex formation. The decrease of the formation rate constant in the series methylcyclohexane, benzene, and o-chlorotoluene may be due to a more difficult formation of the hydrogen bond complex due. to the increase of the dielectric constant in the solvent series.