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The chiral‐induced spin selectivity effect (CISS) is a breakthrough phenomenon that has revolutionized the field of electrocatalysis. We report the first study on the electron spin‐dependent electrocatalysis for the oxygen reduction reaction, ORR, using iron phthalocyanine, FePc, a well‐known molecular catalyst for this reaction. The FePc complex belongs to the non‐precious catalysts group, whose active site, FeN4, emulates catalytic centers of biocatalysts such as Cytochrome c. This study presents an experimental platform involving FePc self‐assembled to a gold electrode surface using chiral peptides (L and D enantiomers), i.e., chiro‐self‐assembled FePc systems (CSAFePc). The chiral peptides behave as spin filters axial ligands of the FePc. One of the main findings is that the peptides′ handedness and length in CSAFePc can optimize the kinetics and thermodynamic factors governing ORR. Moreover, the D‐enantiomer promotes the highest electrocatalytic activity of FePc for ORR, shifting the onset potential up to 1.01 V vs. RHE in an alkaline medium, a potential close to the reversible potential of the O2/H2O couple. Therefore, this work has exciting implications for developing highly efficient and bioinspired catalysts, considering that, in biological organisms, biocatalysts that promote O2 reduction to water comprise L‐enantiomers. [ABSTRACT FROM AUTHOR]

Feeding represents 50–70% of the cost of production in salmon farming, higher than any other animal farm. The improvement of this percentage is challenging as the food is thrown into the fish tank, there is no quantification of the amount of food that is consumed by the fish. In consequence, it is difficult to adjust the food composition making it more nutritive or promoting food consumption by fish. In this study, to investigate food consumption, bio‐distribution and food residues, leucine containing 15N (a stable isotope of nitrogen) was used to label the fish food. Atlantic salmon (Salmo salar) weighing 100–120 g were maintained in 30 L tanks at a density of 14 kg/m3. Fishes were fed daily at 1% of the fish weight with pellet labelled with 15N‐leucine. The 15N incorporation was determined 14 hours after the feeding in all the fish organs. Results showed that 14 hours after the administration of a single dose of labelled food to Atlantic salmon enables the detection of the tracer in the whole organism allowing determining the food consumption. Through the analysis of nitrogen use efficiency (NUE), we showed that the trunk, pyloric caeca and head incorporate the highest level of the marker (72.7, 8.7 and 5.7%, respectively). This methodology would permit monitoring feeding to minimize food loss, improve administration methodologies or select the preferred foods for the fish, among others to reduce production costs. [ABSTRACT FROM AUTHOR]

The article discusses a research study published in Angewandte Chemie International Edition that explores new methods to enhance the activity of iron phthalocyanine (FePc) in the oxygen reduction reaction (ORR) through electron transport phenomena in chiro-self-assembled FePc nanostructures. The study combines the principles of electrocatalysis and molecular electronics to increase the ORR performance, specifically by utilizing the chiral-induced spin selectivity effect. The findings of this study provide valuable insights for designing more efficient electrocatalytic devices. The article also briefly mentions other research articles on topics such as mass spectrometry, phosphorescent materials, single-atom catalysis, and photopatterning. [Extracted from the article]

The article titled "Electron Spin-Dependent Electrocatalysis for the Oxygen Reduction Reaction in a Chiro-Self-Assembled Iron Phthalocyanine Device" explores innovative methods to enhance the activity of iron phthalocyanine (FePc) in the oxygen reduction reaction (ORR). The authors, Rubén Oñate, Alexis Aspee, Ingrid Ponce, and others, combine the principles of electrocatalysis and molecular electronics to improve ORR performance by utilizing electron transport phenomena in chiro-self-assembled FePc nanostructures. This study provides valuable insights for designing efficient electrocatalytic devices. The article also briefly mentions other research topics such as droplet reactions and ion soft-landing, phosphorescent materials, single-atom catalysis, and photopatterning. [Extracted from the article]

A new hybrid cinnamoyl–coumarin probe was synthesised to study the formation and dynamics of a twisted internal charge transfer (TICT) excited state in homogeneous and biological membrane models. This probe showed a large bathochromic shift of the fluorescence band with the solvent polarity, which is associated with the decrease in the fluorescence intensity due to fast non-radiative deactivation pathways, ascribed to TICT excited state formation in polar solvents. The calculated potential energy surfaces using density functional theory (DFT) and time dependent-DFT (TD-DFT) along with the energetic barriers calculated using the ABF methodology established the energy requirements for a rotational twisting of the cinnamoyl–coumarin bond for TICT excited state formation. This strategy has allowed estimating the role of the ground state conformation and excited state distribution that, concomitant with fluorescence lifetime measurements, describes in detail dual fluorescence emission from TICT and ICT excited states. Moreover, the high sensitivity of fluorescence lifetimes of the TICT excited state in liposomes allows us to propose the use of this type of probes as a powerful tool for the study of gel and crystalline liquid phases in lipid membrane models. The development of this new approach will allow rationalizing and understanding the photochemical behavior of fluorescent TICT-based probes in constrained biological environments. [ABSTRACT FROM AUTHOR]