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| - A T-Shaped Three-Coordinate Nickel(I) Carbonyl Complex and theGeometric Preferences of Three-Coordinate d9 Complexes
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| - A three-coordinate diketiminate-nickel(I) complex with a carbonylligand has been characterized using EPR and IR spectroscopiesand X-ray crystallography. The T geometry (bending from thesterically favored C2v structure) contrasts with that of isosteric d9copper(II) complexes. DFT calculations on a truncated modelreproduce experimental geometries, implying that the geometricdifferences are electronic in nature. Analysis of the chargedistribution in the complexes shows that the geometry of the three-coordinate d9 complexes is affected by differential charge donationof the ligands to the metal center.
- LMeNi(CO) (L = β-diketiminate ligand) has been isolated and characterized by EPR, IR, and X-ray techniques. The T geometry of this nickel(II) complex contrasts with that of copper(II) complexes that share the d9 configuration at the metal. DFT calculations show that the geometric differences are electronic in nature. The charge distribution in the complexes suggests that the geometry of the three-coordinate d9 complexes is affected by differential charge donation of the ligands to the metal center.
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