Cationic Methallylnickel Complexes with Chelating Ligands, a New Dynamic Complex Isomerization Equilibrium
摘要:
The synthesis of the cationic complexes [methyl 2-(diphenylphosphino)benzoate-kappa(2)P,O](eta(3)-methallyl)nickel(II) tetrafluoroborate (1), [methyl 2-(diphenylphosphino)nicotinate-kappa(2)P,N](eta(3)-methallyl)nickel(II) tetrafluoroborate (2), and bis[mu-2-(diphenylphosphino)pyridine kappa(2)P,N]bis(eta(3)-methallyl)nickel(II) bis(tetrafluoroborate). CH2Cl2 (3) are reported. The crystal structures of 1 and 2 have been disclosed in a preliminary previous paper. The molecular structure of the cation of 2 in the crystal shows that the ligand forms a strained 4-membered ring with a kappa(2)P,N coordination. In solution a new dynamic complex isomerization was found, indicating an equilibrium between 2 and 4, the latter with a 6-membered ring and a kappa(2)P,O coordination of the ligand methyl 2-(diphenylphosphino)nicotinate (5).
Cationic Methallylnickel Complexes with Chelating Ligands, a New Dynamic Complex Isomerization Equilibrium
摘要:
The synthesis of the cationic complexes [methyl 2-(diphenylphosphino)benzoate-kappa(2)P,O](eta(3)-methallyl)nickel(II) tetrafluoroborate (1), [methyl 2-(diphenylphosphino)nicotinate-kappa(2)P,N](eta(3)-methallyl)nickel(II) tetrafluoroborate (2), and bis[mu-2-(diphenylphosphino)pyridine kappa(2)P,N]bis(eta(3)-methallyl)nickel(II) bis(tetrafluoroborate). CH2Cl2 (3) are reported. The crystal structures of 1 and 2 have been disclosed in a preliminary previous paper. The molecular structure of the cation of 2 in the crystal shows that the ligand forms a strained 4-membered ring with a kappa(2)P,N coordination. In solution a new dynamic complex isomerization was found, indicating an equilibrium between 2 and 4, the latter with a 6-membered ring and a kappa(2)P,O coordination of the ligand methyl 2-(diphenylphosphino)nicotinate (5).