D. Villemin et M. Hachemi, METAL-COMPLEXES AS COLOR INDICATORS FOR THE DETERMINATION OF ACID-BASE PROPERTIES OF SOLID CATALYSTS, Reaction kinetics and catalysis letters, 53(1), 1994, pp. 147-153
The Lewis acid-basicity of a solid catalyst was determinated by using
solution of Cu(tmen) (acac) (NO3) and Fe(phen)(2) (CN)(2) as Lewis aci
d-base indicators.