In the present paper we report the key results of a comprehensive computational study aimed at investigating the dependence of the singlet-triplet energy gap in phenyl-bridged bis-nitroxide diradicals, on the basis set and oil soft structural parameters like torsion and pyramidalization. We have compared the BS-DFT technique with the post-Hartree-Fock DDCI2 multireference approach. With this latter method we have also studied the different role that a and pi core and virtual orbitals have in the resulting singlet-triplet energy gap. The results obtained represent one step forward in the defintion of a protocol for an efficient and reliable computation of spin-spin Coupling in diradical systems.
|Autori:||V. BARONE; CACELLI I; P. CIMINO; A. FERRETTI; S. MONTI AND G. PRAMPOLINI|
|Titolo:||Magnetic interactions in phenyl-bridged nitroxide diradicals: conformational effects by multireference and broken symmetry DFT approaches|
|Anno del prodotto:||2009|
|Digital Object Identifier (DOI):||10.1021/jp9053346|
|Appare nelle tipologie:||1.1 Articolo in rivista|