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- W2019994233 abstract "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<acac<<tfac, pfac<<hfac, which is almost opposite to the order of their pKa values." @default.
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- W2019994233 date "1991-01-01" @default.
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- W2019994233 title "Studies on Mixed Chelates. XIX. 5-Coordinate Nickel(II) Complexes with<i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>″,<i>N</i>″-Pentamethyldiethylenetriainine and β-Diketonates" @default.
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- W2019994233 doi "https://doi.org/10.1246/bcsj.64.252" @default.
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