A new Tellurium-bearing substituted β-diketone: Synthesis and properties

Revision and Analysis of the Formation Constants of Rare Earth Diketonates

“…This transition relates to the transformation from enol to a ketone tautomer. DFT calculations have shown that keto-form is the most stable isomer for diketones with heavy chalcogens (Se and Te , ) but for other compounds the results were opposite . A more careful search of optimization geometries has demonstrated that for all diketones the keto-form is predominant in water.…”

“…Spectral data were previously published in the series of works − listed in the corresponding Supporting Information. Each metal–ligand system has been studied in water media (concentration of ethanol does not exceed 2%) under the excess metal ions ( C M ≫ C L , of 10 times or more) at a constant concentration of ligand (molar series method).…”

“…This property makes it possible to measure the chelation process between REMs and diketones using optical spectrophotometric apparatuses and determine spectral as well as thermodynamic parameters. Using this opportunity, our research team has studied several β-diketones, − some of which have been obtained for the first time. , All of these ligands can be divided into two groups: diketones with a five-membered chalcogen ring and ones with a substituted phenyl moiety (Figure ). A total of 170 conditional stability constants were determined and over 1100 single spectra of the complex species were recorded.…”

“…Using this opportunity, our research team has studied several βdiketones, 19−23 some of which have been obtained for the first time. 24,25 All of these ligands can be divided into two groups: diketones with a five-membered chalcogen ring and ones with a substituted phenyl moiety (Figure 1). A total of 170 conditional stability constants were determined and over 1100 single spectra of the complex species were recorded.…”