The infinite dilution binary diffusion coefficients D-12 for aluminum acetylacetonate in supercritical CO2 were determined at 308.15-333.15 K and at 7.80-40.00 MPa by the chromatographic impulse response (CIR) method. And, the diffusion measurements in liquid ethanol were carried out at 300.15-333.15 K and at 0.10 and 30.00 MPa by the Taylor dispersion method. It was found that the D-12 values measured in supercritical CO2 show slowing down in the region of near critical point. The determined activation energies of diffusion were 23.0, 13.7, 12.0, 11.3 kJ/mol at 12.00, 20.00, 25.00, 35.00 MPa in supercritical CO2 and 19.1 kJ/mol at 0.10 MPa in liquid ethanol, respectively. All determined 90 diffusion data in this study can be correlated with the equation of D-12 [m(2)/S] = 1.558 x 10(-14) T [K] eta [Pa s](-0.761) with average absolute relative deviation (AARD) of 5.6% over a wide fluid viscosity range from 2.462 x 10(-5) to 1.258 x 10(-3) Pa s. (C) 2016 Elsevier B.V. All rights reserved.