Studies on mixed chelates. XIX. 5-coordinate nickel(II) complexes with N,N,N'N",N"-pentamethyldiethylenetriamine and .BETA.-diketonates.

Mixed Ni(II) chelates with N,N,N′,N″,N″-pentamethyldiethylenetriamine (pmdt) and a β-diketonate (dike) such as acetylacetonate(acac), dipivaloylmethanate(dipm), pivaloyltrifluoroacetonate(pfac), trifluoroacetylacetonate(tfac) or hexafluoroacetylacetonate(hfac) were prepared, and their structure and properites were studied. X-Ray crystal analysis confirmed that [Ni(acac)(pmdt)]ClO4 is a distorted square pyramidal complex, and the solid reflection spectra of the remaining chelates indicated that most of them are also essentially square pyramidal. This structure is retained in a nonpolar solvent like 1,2-dichloroethane, but in strong donor solvents like DMSO or DMF it is converted into a 6-coordinated structure, [Ni(dike)(pmdt)(Solvent)]+, containing a solvent molecule. The formation of this species is favored by increasing donor number(DN) of the solvent, and in the following order of dike:dipm

Keywords:

• Square pyramidal molecular geometry
• Donor number
• Inorganic chemistry
• Diketone
• Molecule
• Chelation
• Solvent
• Nickel
• Chemistry
• X-ray crystallography
• Crystal structure

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