The structure, stability and electronic properties of PtmIrnNO(m + n = 2-7) clusters have been investigated via density functional theory. All ground state structures show an adsorption of NO at the top site of the bare cluster via the N atom. In all of the bimetallic clusters, the NO molecule prefers to be adsorbed near the Ir atom site. The adsorption energy of bimetallic PtmIrnNO (\(m+n=2,4,6\)) is larger than that of pure clusters with the same cluster size, showing that the interaction of even alloy clusters and NO molecule are stronger. There exist clear even-odd oscillations in the second-order energy difference curves of PtmIrNO and PtIrnNO, indicating that Pt3IrNO, Pt5IrNO, PtIr3NO and PtIr5NO clusters are more stable than their neighbors. It is obvious that there exist odd-even oscillations in the curves of \(m+n=3,4,6\) energy gaps, showing that PtIr2NO, Pt3IrNO, PtIr3NO and Pt3Ir3NO clusters are chemically more stable. Magnetic and electronic properties analyses show that the total magnetic moment provided by Ir and Pt atoms, and the magnetic moment mainly arises from localization of the d-electron.
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