Johnson, P. R. published the artcileElectronic spectra of copper(II) β-ketoenolates. Intraligand and charge transfer transitions, Category: copper-catalyst, the publication is Journal of Molecular Structure (1975), 29(1), 97-103, database is CAplus.
The electronic spectra in (MeOH) of the Na salts and Cu(II) complexes of 13 β-diketones are reported within the energy range 25-48 kkaysers. Spectra of the Na salts of ligands with alkyl substituents exhibit 1 band which is assigned to the π3→π4 intraligand transition. Where aryl substituents are present, an addnl. benzenoid band is observed The spectra of the Cu complexes exhibit 2 bands whether aryl substituents are present or not. The band of lower energy is assigned to the π3→π4 transition and the band of higher energy to the σL→3dxy charge transfer transition. Intensity relations suggest that, where aryl substituents are present, the benzenoid band is superimposed on the charge transfer band. The observed transition energies exhibit a good level of agreement with those predicted by Hueckel MO calculations Comparison of the π3→π4 transition energies of the Cu complexes with those available for the β-ketoenolates of other metal ions supports indications from ESR spectra that there is very little π-orbital overlap in the Cu-O bonds.
Journal of Molecular Structure published new progress about 14284-06-1. 14284-06-1 belongs to copper-catalyst, auxiliary class Copper, name is Copper(II) ethylacetoacetate, and the molecular formula is 0, Category: copper-catalyst.
Referemce:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4660968/,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”