Dentate number and functionality of O, N-donor ligands for the growth and catalytic reaction of iridium nanoparticles

Abstract

The catalytic nature of iridium nanoparticles is immensely dependent upon the synthesis procedure, especially on the type of chelating agent used for catalyst in decomposition of hydrazine monohydrate. The mononuclear iridium complexes in high oxidation states have been employed on alumina support for hydrazine catalytic decomposition by mono- and bi-dentate O^N ligands with different steric hindrance and tetra-dentate O^N^N^O Schiff base ligand, namely [N,N′-bis(salicylidene)-1,2-phenylenediamine] as H2-Salpn. Coordination chemistry in the trimesic acid, acetylacetone, hydroxyacetophenone, and H2-Salpnmolecules with Ir-catalyzed reaction relates to the electronic properties of the ligand substituents, with N and O donor electron substituents. The type of an atom along the reaction coordinate can have significance for the design of hydrazine catalyst, particularly those that use in special reactions. With the incorporation of Tma and H2-Salpn ligands, the catalytic performance of the resulting iridium catalysts was outstandingly modified for catalytic activity, but interestingly the hydrogen selectivity remained constant from hydrazine decomposition.