Chemo-enzymatic cascade processes are invaluable due to their ability to rapidly construct high-value products from available feedstock chemicals in a one-pot relay manner. In an article, author is Bellucci, Luca, once mentioned the application of 123-32-0, Name is 2,5-Dimethylpyrazine, molecular formula is C6H8N2, molecular weight is 108.14, MDL number is MFCD00006147, category is Pyrazines. Now introduce a scientific discovery about this category, SDS of cas: 123-32-0.
Composition-Thermometric Properties Correlations in Homodinuclear Eu3+ Luminescent Complexes
A family of homodinuclear Ln(3+) (Ln(3+) = Gd3+, Eu3+) luminescent complexes with the general formula [Ln(2)(beta-diketonato)(6)(N-oxide)(y)] has been developed to study the effect of the beta-diketonato and N-oxide ligands on their thermometric properties. The investigated complexes are [Ln(2)(tta)(6)(pyrzMO)(2)] (Ln = Eu (1.C7H8), Gd (5)), [Ln(2) (dbm)(6) (pyrzMO)(2)] (Ln = Eu (2), Gd (6)), [Ln(2)(bta)(6) (pyrzMO)(2)] (Ln = Eu (3), Gd (7)), [Ln(2)(hfac)(6)(pyrzMO)(3)] (Ln = Eu (4), Gd (8)) (pyrzMO = pyrazine N-oxide, Htta = thenoyltrifluoroacetone, Hdbm = dibenzoylmethane, Hbta = benzoyltrifluoroacetone, Hhfac = hexafluoroacetylacetone, C7H8 = toluene), and their 4,4′-bipyridine N-oxide (bipyMO) analogues. Europium complexes emit a bright red light under UV radiation at room temperature, whose intensity displays a strong temperature (T) dependence between 223 and 373 K. This remarkable variation is exploited to develop a series of luminescent thermometers by using the integrated intensity of the D-5(0) -> F-7(2) europium transition as the thermometric parameter (Delta). The effect of different beta-diketonato and N-oxide ligands is investigated with particular regard to the shape of thermometer calibration (Delta vs T) and relative thermal sensitivity curves: i.e.. the change in Delta per degree of temperature variation usually indicated as S-r (% K-1). The thermometric properties are determined by the presence of two nonradiative deactivation channels, back energy transfer (BEnT) from Eu3+ to the ligand triplet levels and ligand to metal charge transfer (LMCT). In the complexes bearing tta and dbm ligands, whose triplet energy is ca. 20000 cm(-1), both deactivation channels are active in the same temperature range, and both contribute to determine the thermometric properties. Conversely, with bta and hfac ligands the response of the europium luminescence to temperature variation is ruled by LMCT channels since the high triplet energy (>21400 cm(-1)) makes BEnT ineffective in the investigated temperature range.
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