Jose Diogo Lisboa Dutra

This study aimed to evaluate the effects of energy and nutrient (lysine, calcium, and phosphorus) levels on animal performance and liver expression of genes related to lipid metabolism and electron transport in broilers from 22 to 42 days of age. A total of 432 male Cobb 500 broiler chickens were distributed in a completely randomized design with 3 treatments, 8 replications, and 18 birds per experimental unit. The first treatment (control) consisted of a diet based on corn and soybean meal with a metabolizable energy (ME) content of 12.70 MJ/kg. The second treatment was a high-energy (HE) diet (13.33 MJ/kg) formulated by increasing the ME value of the control diet by 0.63 MJ/kg and maintaining the same levels of digestible lysine, calcium (Ca), and available phosphorus (P). The third treatment was a high-energy and high-nutrient (HEHN) diet, providing 13.33 MJ/kg and a 5% increase in digestible lysine, Ca, and P levels in relation to the control diet. Animal performance and carcass yield were analyzed at 42 days of age. Expression levels of apolipoprotein B (APOB), NADH dehydrogenase subunit I (ND1), and cytochrome c oxidase (COX1) genes were also determined. Treatments exerted significant effects on performance but not on carcass yield. HE diets improved feed efficiency compared with the control. Furthermore, the HEHN diet enhanced weight gain compared with the control. COX1 and ND1 expression was influenced by dietary energy level. In conclusion, the results indicate that HEHN diets improve performance and alter the expression of genes related to lipid metabolism and electron transport in broiler chickens from 22 to 42 days of age but do not affect carcass yield.

There is no doubt about the relevance that lanthanide‐based luminescent systems have gained in recent decades. These systems have applications in various technological fields, and the development of these materials has been of great scientific interest since the 1970s. We made the first version of the LUMPAC software available 10 years ago. In our publication, we highlighted the scarcity of studies concerning the use of theoretical computational methods to design new luminescent systems and to explain laboratory‐observed phenomena involving such systems. In this work, we present the LUMPAC 2.0 software. We show how the first version contributed to increasing the number of studies involving theoretical computational methods, and we evaluate its use since its launch. This second version introduces highly relevant features and implementations and will undoubtedly be an important tool in new studies that will be carried out over the next few years.

A monochromatic red emitting nonacoordinate organoeuropium complex with the formula [Eu(hfaa)₃(Ph-TerPyr)] (Eu-1) incorporating hexafluoroacetylacetone (hfaa) primary ligands and a tridentate 4′-phenyl-2,2′:6′,2′′-terpyridine (Ph-TerPyr) ancillary ligand has been synthesized. The complex was characterized by analytical and spectroscopic methods, and its structure was established by single crystal X-ray diffraction (SC-XRD) analysis at low temperature, which explicitly confirms that the coordination sphere is composed of a EuO₆N₃ core. Under the UV excitation, Eu-1 displayed typical red emission in solution with a long-excited state lifetime (τ_obs = 1048.06 ± 9.39 μs) with a good photoluminescence quantum yield (Q^L _Eu = 41.14%). We have utilized pump-probe ultrafast transient absorption spectroscopy in tandem with the time-dependent density functional theory (TD-DFT) and the Lanthanide Luminescence Software Package (LUMPAC) to explore the intricate photophysical event that occurs in the vicinity of the ligands of Eu-1 sensitized photoluminescence (PL).

Two novel nona‐coordinated Eu(III) complexes [Eu(btfa)₃(Ph‐TerPyr)] (Eu‐1) and [Eu(NTA)₃(Ph‐TerPyr)] (Eu‐2) have been synthesized and characterized. The structure of the complexes was elucidated by density functional theory (DFT) methods. The experimental photophysical properties of the complexes were investigated and complemented with theoretical calculations. Effective energy transfer (ET) pathways for the sensitized red luminescence is discussed. The complexes were tested as emitting layers (EML) in organic light emitting diodes (OLEDs). At the optimum doping concentration of 4 wt.%, the double‐EML OLEDs of Eu‐1 exhibited red electroluminescence (EL) with an EQE of 4.0 % and maximum brightness (B)=1179 cd/m², maximum current efficiency (η_c)=5.64 cd/A, and maximum power efficiency (η_p)=4.78 lm/W at the current density (J) of 10 mA/cm². Interestingly, the double‐EML OLEDs of Eu‐2 at the optimum concentration of 3 wt.%, displayed an outstanding EL performance with EQE of 7.32 % and B=838 cd/m², η_c=10.19 cd/A and η_p=10.33 lm/W at J=10 mA/cm². The EL performance of this device is among the best reported for devices incorporating a europium complex as a red emitter.

Two new organo-europium complexes (OEuCs) [Eu(tfac)₃(TB-Im)] (Eu1) [Eu(hfac)₃(TB-Im)] (Eu2) incorporating fluorinated (hexafluoroacetylacetone; Hhfaa) or hemi-fluorinated (trifluoroacetylacetone; Htfac) β-diketones together with the large bite angle N^N ligand (2-(4-thiazolyl)benzimidazole; TB-Im) have been synthesized and characterized. The structure of the complexes has been established by single crystal X-ray diffraction (SC-XRD) analysis and shows that the coordination sphere is composed of a EuO₆N₂ core (octacoordinated). Continuous shape measures (CShMs) revealed that the geometry around Eu(III) is trigonal dodecahedral with approximate D_2d-symmetry. Efficient red emission is observed for both the complexes in solution with a fairly large photoluminescence quantum yield (PLQY (Q^L _Eu) = 39.00–47.00%). Furthermore, by utilizing the experimental photoluminescence (PL) data and theoretical modelling employing density functional theory (DFT) in conjunction with LUMPAC, energy transfer (ET) and back energy transfer rates were calculated, and an ET mechanism for the sensitized PL is proposed and discussed in detail. Finally, the complexes were used as an emitting layer (EML) to fabricate 20 organic light emitting diodes (OLEDs) by varying the doping concentration. Interestingly, both the complex-based OLEDs at 4 wt% doping concentration display white electroluminescence (EL) with the brightness (B) = 100.5–364.1 cd m⁻² at very low turn-on voltage (V_turn-on) = 3.9–4.6 V. The overall electroluminescence performance of Eu1 and Eu2 is higher than that of the reported europium based single component white-OLEDs.

The preparation and photoluminescent properties of the new [Eu(FOD)₃(2-Pyr)₂] complex (FOD = 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octadionate; 2-Pyr = 2-pyrrolidone) are reported. The obtained complex was characterized by elemental analysis, complexometric titration using EDTA, infrared spectroscopy, and single-crystal X-ray diffraction studies. The coordination polyhedron of the complex is described as a distorted square antiprismatic with both 2-Pyr monodentate ligands coordinated to Eu(III) via the oxygen atoms, in neutral form, while the three FOD molecules are coordinated in the anionic form. Structural modeling at the PBE1PBE/SVP/MWB52 level of theory provided a geometry in excellent agreement with the one obtained experimentally. Spectroscopy properties such as intensity parameters (Ω₂ and Ω₄), radiative emission rate (A_rad), and chemical partition of A_rad for [Eu(FOD)₃(2-Pyr)₂] and [Eu(FOD)₃(H₂O)₂] were calculated by using the QDC model with help of the semiempirical wavefunctions. The modeling of the ligand-to-metal energy transfer for both complexes was performed, allowing to obtain the theoretical emission quantum yield and to characterize the most relevant molecular orbitals involved.

The heteronuclear trimetallic d–f–d complex [Eu(btfa)₃{(Ph)(Et₃P)₂Pt–CC–R–CC–Pt(Et₃P)₂(Ph)}] has been synthesized and characterized spectroscopically. The complex displays both red and green emissions in solution.