Abstract
Abstract Electronic spectra of Ni(acac)2 were studied in acetone, DMF, and some other solvents for the purpose of identifying the cis/trans isomers from the spectra (acac− = acetylacetonate anion). The spectral components were investigated in the spin-allowed transition bands, and a relationship was found between the spectral pattern and the cis/trans isomers. According to this relationship, it was concluded that the cis isomer was formed in DMF and in N-methylformadide, whereas the trans isomer was formed in acetone and in pyridine. Based on the DFT computation, the cis-[Ni(acac)2(DMF)2] was found to be stabilized by intramolecular hydrogen bonds between acetylacetonate and DMF.
Published Version
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