title: DFT analysis of g and 13C hyperfine coupling tensors for model Ni(I)(CO)(n)L(m) (n = 1-4, L = H2O, OH-) complexes epitomizing surface nickel(I) carbonyls.
abstract: Relativistic calculations within the spin-orbit mean-field (SOMF) approximation, the zero-order regular approximation (ZORA), and the scalar relativistic method based on the Pauli Hamiltonian were performed for the prediction and interpretation of the electronic g tensor and (13)C hyperfine tensor for a set of model polycarbonyl nickel(I) complexes with aqua or hydroxy coligands. They exhibit extensive similarities with heterogeneous [Ni(I)(CO)(n)]-surface complexes produced upon adsorption of carbon monoxide on Ni(I) ions grafted on silica or inside the zeolite channels. Benchmark calculations showing the influence of the exchange-correlation functional on the g tensor were carried out for well-defined nickel(I) complexes of known structure. On this basis, the SOMF-B3LYP scheme was chosen for calculations of the g tensor, and the obtained results were in satisfactory agreement with literature EPR data found for the [Ni(I)(CO)(n)]/SiO(2) system. The calculated g and A((13)C) tensors allowed polycarbonyl complexes of various stereochemistries to be distinguished. The nature of the Deltag(ii) shifts was assessed in terms of the molecular orbital contributions due to the magnetic-field-induced couplings and their structure sensitivity. The noncoincidence of g and (13)C hyperfine principal axes and their orientation with respect to the molecular framework was also examined. The ability of DFT calculations to follow consistently variations of the EPR parameters induced by stereochemical changes around the Ni(I) center provides an invaluable reference for the interpretation of experimental results.
authors.affiliation: Faculty of Chemistry and Regional Laboratory for Physicochemical Analyses and Structural Research, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland. pietrzyk@chemia.uj.edu.pl
authors.forename: Piotr
authors.initials: P
authors.lastname: Pietrzyk
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Podolska
authors.forename: Zbigniew
authors.initials: Z
authors.lastname: Sojka
mesh_terms: D004578:Electron Spin Resonance Spectroscopy; D009532:Nickel / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D011789:Quantum Theory; D012822:Silicon Dioxide / Q000737:chemistry; D013499:Surface Properties
chemical_list: D009942:Organometallic Compounds; D012822:Silicon Dioxide; D009532:Nickel