High-spin Ni(II), a surprisingly good structural model for [NiFe] hydrogenase.
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abstract
The first density functional calculations on high-spin (HS) Ni(II) models for the active site of the [NiFe] hydrogenases predict a ligand arrangement about Ni that is in better agreement with the crystal structures than previous predictions for low-spin (LS) Ni(II) models. With the crystal structures' geometry, the HS form is approximately 20 kcal/mol lower in energy than the LS one.