Saturated vapor pressure of iridium(III) acetylacetonate

The temperature dependency of the saturated vapor pressure of Ir(acac)(3) h as been measured by the method of calibrated volume (MCV), the Knudsen meth od, the flow transpiration method, and the membrane method. The thermodynam ic parameters of phase transition of a crystal to gas were calculated using each of these methods, and the following values of Delta H-T(0) (kJ mol(-1 )) and Delta S-T(0) (J mol(-1) K-1), respectively, were obtained: MCV: 101.59, 156.70; Knudsen: 130.54, 224.40; Flow transpiration: 129.34, 212.23; Membrane: 95.45, 149.44 Coprocessing of obtaining data (MCV, flow transportation method and Knudsen method) at temperature ranges 110-200 degrees C as also conducted:Delta H- T(0) =127.9-2.1 (kJ mol(-1)); Delta S-T(0)=215.2-5.0 (J mol(-1) K-1).