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

Zahra Amirsardari, Akram Dourani, Mohamad Ali Amirifar, Nooredin Ghadiri Massoom, Amirhossein Javadi, Rahim Ehsani, and Reza Ghanbarnejad

Space Transportation Research Institute, Iranian space research center, Tehran, Iran



Received: 22 February 2020  Accepted: 29 March 2020


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.

Keywords: Iridium nanoparticles; Ligand effect; Schiff base ligand; Size and distribution; Catalyst activity

Full paper is available at

DOI: 10.1007/s11696-020-01148-8


Chemical Papers 74 (10) 3233–3241 (2020)

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