Successful grafting of isolated molecularCr7Nirings on Au(111) surface

• DOI: 10.1103/physrevb.79.144419
• Publication Date: 2009-04-16T17:05:24Z
• Authors: V. Corradini; F. Moro; R. Biagi; V. De Renzi; U. del Pennino; V. Bellini; S. Carretta; P. Santini; V. A. Milway; G. Timco; R. E. P. Winpenny; M. Affronte
• Keywords: Hamiltonian (control theory)

We deeply investigated the properties of submonolayer distributions isolated molecular ${\text{Cr}}_{7}\text{Ni}$ rings deposited on Au(111) by liquid phase. X-ray absorption spectra measured at Cr and $\text{Ni}\text{ }{\text{L}}_{2,3}$ edges show that grafting onto gold surface does not affect oxidation state local symmetry Ni sites. The circular dichroism shows a change in sign magnetic moment. This is due to reduction exchange coupling constants that, however, preserves structure low-energy levels grafted rings, as corroborated spin-Hamiltonian simulations comparison with measurements bulk sample. Density-functional theory calculations Ni-Cr bond gets weaker slight ring distortion suggesting possible explanation for observed behavior. These results complex molecules can be surfaces, changes their behavior must examined individual cases.