In: Monatshefte für Chemie / Chemical Monthly, 2005, vol. 136, no. 6, p. 925-963
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In: Inorganic Chemistry, 2011, vol. 50, no. 16, p. 7460–7477
A theoretical, computational, and conceptual framework for the interpretation and prediction of the magnetic anisotropy of transition metal complexes with orbitally degenerate or orbitally nearly degenerate ground states is explored. The treatment is based on complete active space self-consistent field (CASSCF) wave functions in conjunction with N-electron valence perturbation theory...
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In: Journal of Organometallic Chemistry, 2007, vol. 692, no. 26, p. 5709-5716
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In: Inorganic Chemistry, 2008, vol. 47, no. 7, p. 2449–2463
Magnetic anisotropy in cyanide-bridged single-molecule magnets (SMMs) with FeIII−CN−MII (M = Cu, Ni) exchange-coupled pairs was analyzed using a density functional theory (DFT)-based ligand field model. A pronounced magnetic anisotropy due to exchange was found for linear FeIII−CN−MII units with fourfold symmetry. This results from spin–orbit...
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In: The Journal of Physical Chemistry A, 2007, vol. 111, no. 37, p. 9145 -9163
The topology of the ground-state potential energy surface of M(CN)₆ with orbitally degenerate ²T2g (M = TiIII (t2g¹), FeIII and MnII (both low-spin t2g⁵)) and ³T1g ground states (M = VIII (t2g²), MnIII and CrII (both low-spin t2g⁴)) has been studied...
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In: The Journal of Physical Chemistry A, 2006, vol. 110, no. 49, p. 13332 -13340
Exchange coupling across the cyanide bridge in a series of novel cyanometalate complexes with CuII-NC-MIII (M = Cr and low-spin Mn,Fe) fragments has been studied using the broken-symmetry DFT approach and an empirical model, which allows us to relate the exchange coupling constant with σ-, π-, and π*-type spin densities of the CN⁻ bridging ligand. Ferromagnetic...
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In: Tetrahedron, 2006, vol. 62, no. 48, p. 11106-11111
A new 1,3-dithiol-2-ylidene substituted naphthopyranone 2 has been synthesized and characterized. UV–vis spectroscopic and cyclic voltammetry results, interpreted on the basis of density functional theory, show that 2 displays an intramolecular charge-transfer transition and acts like a donor–acceptor (D–A) system. Furthermore, a weak fluorescence originating from the excited...
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In: Chemical Physics Letters, 2006, vol. 427, no. 4-6, p. 449-454
Using a DFT based Ligand Field treatment (LFDFT) of the electronic structure of Co(II) and Cu(II) porphyrins (CoP and CuP) we analyse the origin of their EPR spectra. From a comparison between theoretical result on Co model clusters (CoP and CoP–ZnP dimer) we conclude that the g-tensor values are very sensitive to the axial coordination which stabilizes a ²A₁ ground state in good...
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In: Chimia, 2005, vol. 59, no. 7-8, p. 504-510
The research activity within our laboratory of computational chemistry at the University of Fribourg is presented. In this review, a brief outline of a recently proposed Ligand Field Density Functional Theory (LFDFT) model for single nuclear and its extension to dimer transition metal complexes is given. Applications of the model to dinuclear complexes are illustrated for the interpretation...
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In: Comptes Rendus Chimie, 2005, vol. 8(9-10), p. 1421-1433
An overview of the theory and applications of a recently proposed ligand-field density functional theory (LFDFT) is given. We describe a procedure based on DFT allowing to deduce the parameters of this non-empirical LF approach consisting of the following steps: (i) an average of configuration (AOC) DFT calculation, with equal occupancies of the d-orbitals is carried out (ii) with...
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