Nickel(II) complexes of 3-alkylacetylacetones
AW Addison and DP Graddon
Australian Journal of Chemistry
21(8) 2003 - 2012
Nickel(11) complexes have been prepared from 3-alkylacetylacetones, LH = CH3COCHRCOCH3 (R = Me, Et, Bu, and CH2Ph). The anhydrous complexes, NiL2, are red and diamagnetic in the solid state and dissolve in toluene to give equilibrium mixtures of monomeric, low-spin and trimeric, high-spin species. Equilibrium constants have been obtained for the low-spin-high-spin equilibrium when R = Et or CH2Ph. Reaction with pyridine in toluene solution gives the adducts NiL2 py2, probably with Ni2L4 py as an intermediate. The relative stabilities of the low-spin and high-spin forms of NiL2 are shown to depend not only on steric factors, but also on electronic factors related to the acid dissociation constants of the ligands, LH.
Full text doi:10.1071/CH9682003
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