Synthesis, Spectroscopic Properties and Structural Studies of Copper(II) Complexes of 2-Substituted-1,3-Diphenyl-1,3-Propanedione, Their 2,2'-Bipyridine and 1,10-Phenanthroline Adducts

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 λ 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.

Synthesis, Physicochemical Properties and Antimicrobial Activities of Nickel(II) Complexes of 4,4,4-Trifluoro-1-(2-Naphthyl)-1,3-Butanedione and Their Adducts

“…Assignments of the infrared bands were made by comparing the spectra of the compounds with those already reported in the literature on similar systems (Omoregie, 2012;Omoregie et al, 2018). Literature review has shown that infrared spectra of β-diketones shows an appreciable coupling of different vibrational modes due to overlap of absorption frequencies (Nakamoto et al, 1961, Woods et al;2009a;Woods et al, 2009b;Omoregie et al, 2014;Omoregie and Woods, 2011). The metal-free ligand, HL, which consists of the uncoordinated C=O+C=C stretching vibrations has a double band in the 1603-1516 cm -1 region.…”