Abstract
The complexes of 2-substituted-1,3-diphenyl-1,3-propanedione with copper(II) ion and their 2,2'-bipyridine and 1,10-phenanthroline adducts were synthesised and characterised by microanalysis, conductance, magnetic and spectral measurements. The conductance data showed that [Cu(dbm)(phen)](dbm) and [Cu(Me-dbm)(phen)](Me-dbm) are 1:1 electrolytes. The infrared spectra revealed the different shifts of the carbonyl frequency. While the electronic solid reflectance spectra of the prepared complexes exhibited three peaks with varying ?max between 12,121-21,505 cm-1, the adducts displayed single bands in the visible region between 13,553-14,698 cm-1 except for [Cu(dbm)(phen)](dbm) and [Cu(Me-dbm)(phen)](Me-dbm) with additional two peaks. These peaks have been assigned as d-d transitions. Using Density Functional Theory (DFT) and Semi-empirical PM3, the modeled compound showed a distorted five coordinate square pyramidal geometry.
Highlights
The complexes of 2-substituted-1,3-diphenyl-1,3-propanedione with copper(II) ion and their 2,2′-bipyridine and 1,10-phenanthroline adducts were synthesised and characterised by microanalysis, conductance, magnetic and spectral measurements
The infrared spectra revealed the different shifts of the carbonyl frequency
We have recently reported the magnetic and spectral properties of nickel(II) complexes of 2-substituted-1,3-diphenyl-1,3-propanedione and their 2,2′-bipyridine and 1,10-phenanthroline adducts and were able to correlate the band shifts with the positive inductive effect of the substituted alkyl group on the system (Woods et al, 2009)
Summary
The following reagents were used: 1,3-diphenyl-1,3-propanedione or dibenzoylmethane (dbmH) (Aldrich chemicals), potassium carbonate, copper acetate, methyl iodide, ethyl iodide, n-butyl iodide (Aldrich chemicals), 2,2′-bipyridine and 1,10-phenanthroline (Analytical grade)
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