21 research outputs found
Spectroscopic evidence in solid and solution of a discrete copper(I) tetrahedral complex dimer supported by supramolecular interactions
The first study of the self-association of a copper(I) tetrahedral complex ([Cu(N-{4-nitrophenyl}pyridine-2-yl-methanimine)(PPh 3)Br]) has been performed. The formation of a discrete dimer supported by supramolecular π-π stacking and C-H·Br interactions was established by X-ray diffraction techniques. 1D- and 2D NMR techniques were used for the structural characterization of this compound in solution. Unexpected 1H- 1H NOE effects are coherent with the presence of a dimer in solution, whose structure replicates that found in the crystal. Dimerization constants obtained by VT- 1H NMR spectroscopy allowed the determination ofthe thermodynamic parameters for the self-association process, namely ΔS = -0.67±0.21 calmol -1K -1, ΔH = -2.00±0.05 kcalmol -1 and ΔG(298 K) = -1.79 kcalmol -1. Consequently, this association process is enthalpy driven.Fil: Jara, Danilo H.. Universidad de Santiago de Chile; ChileFil: Lemus, Luis. Universidad de Santiago de Chile; ChileFil: Farías, Liliana. Universidad de Santiago de Chile; ChileFil: Freire Espeleta, Eleonora. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica; Argentina. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología; ArgentinaFil: Baggio, Ricardo Fortunato. Comisión Nacional de Energía Atómica; ArgentinaFil: Guerrero, Juan. Universidad de Santiago de Chile; Chil
The CMS Phase-1 pixel detector upgrade
The CMS detector at the CERN LHC features a silicon pixel detector as its innermost subdetector. The original CMS pixel detector has been replaced with an upgraded pixel system (CMS Phase-1 pixel detector) in the extended year-end technical stop of the LHC in 2016/2017. The upgraded CMS pixel detector is designed to cope with the higher instantaneous luminosities that have been achieved by the LHC after the upgrades to the accelerator during the first long shutdown in 2013–2014. Compared to the original pixel detector, the upgraded detector has a better tracking performance and lower mass with four barrel layers and three endcap disks on each side to provide hit coverage up to an absolute value of pseudorapidity of 2.5. This paper describes the design and construction of the CMS Phase-1 pixel detector as well as its performance from commissioning to early operation in collision data-taking.Peer reviewe
SARS-CoV-2 susceptibility and COVID-19 disease severity are associated with genetic variants affecting gene expression in a variety of tissues
Variability in SARS-CoV-2 susceptibility and COVID-19 disease severity between individuals is partly due to
genetic factors. Here, we identify 4 genomic loci with suggestive associations for SARS-CoV-2 susceptibility
and 19 for COVID-19 disease severity. Four of these 23 loci likely have an ethnicity-specific component.
Genome-wide association study (GWAS) signals in 11 loci colocalize with expression quantitative trait loci
(eQTLs) associated with the expression of 20 genes in 62 tissues/cell types (range: 1:43 tissues/gene),
including lung, brain, heart, muscle, and skin as well as the digestive system and immune system. We perform
genetic fine mapping to compute 99% credible SNP sets, which identify 10 GWAS loci that have eight or fewer
SNPs in the credible set, including three loci with one single likely causal SNP. Our study suggests that the
diverse symptoms and disease severity of COVID-19 observed between individuals is associated with variants across the genome, affecting gene expression levels in a wide variety of tissue types
Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries
Abstract
Background
Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres.
Methods
This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries.
Results
In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia.
Conclusion
This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries
Two Distinct Transitions in Cu<sub><i>x</i></sub>InS<sub>2</sub> Quantum Dots. Bandgap versus Sub-Bandgap Excitations in Copper-Deficient Structures
Cu-deficient CuInS<sub>2</sub> quantum
dots (QDs) synthesized by
varying the [Cu]:[In] ratio allow modulation of optical properties
as well as identification of the radiative emission pathways. Absorption
and emission spectral features showed a strong dependence on the [Cu]:[In]
ratio of Cu<sub><i>x</i></sub>InS<sub>2</sub> QDs, indicating
two independent optical transitions. These effects are pronounced
in transient absorption spectra. The bleaching of band edge absorption
and broad tail absorption bands in the subpicosecond–nanosecond
time scale provide further evidence for the dual optical transitions.
The recombination process as monitored by photoemission decay indicated
the involvement of surface traps in addition to the bandgap and sub-bandgap
transitions. Better understanding of the origin of the optical transitions
and their influence on the photodynamics will enable utilization of
ternary semiconductor quantum dots in display and photovoltaic devices
AgInS<sub>2</sub>–ZnS Quantum Dots: Excited State Interactions with TiO<sub>2</sub> and Photovoltaic Performance
Multinary
quantum dots such as AgInS<sub>2</sub> and alloyed AgInS<sub>2</sub>–ZnS are an emerging class of semiconductor materials for
applications in photovoltaic and display devices. The nanocrystals
of (AgInS<sub>2</sub>)<sub><i>x</i></sub>–(ZnS)<sub>1–<i>x</i></sub> (for <i>x</i> = 0.67)
exhibit a broad emission with a maximum at 623 nm and interact strongly
with TiO<sub>2</sub> nanostructures by injecting electrons from the
excited state. The electron transfer rate constant as determined from
transient absorption spectroscopy was 1.8 × 10<sup>10</sup> s<sup>–1</sup>. The photovoltaic performance was evaluated over
a period of a few weeks to demonstrate the stability of AgInS<sub>2</sub>–ZnS when utilized as sensitizers in solar cells. We
report a power conversion efficiency of 2.25% of our champion cell
1 month after its fabrication. The limitations of AgInS<sub>2</sub>–ZnS nanocrystals in achieving greater solar cell efficiency
are discussed
Size-Dependent Photovoltaic Performance of CuInS<sub>2</sub> Quantum Dot-Sensitized Solar Cells
The
optical and electronic properties of quantum dots (QDs), which
are drastically affected by their size, have a major impact on their
performance in devices such as solar cells. We now report the size-dependent
solar cell performance for CuInS<sub>2</sub> QDs capped with 1-dodecanethiol.
Pyramidal shaped CuInS<sub>2</sub> QDs with diameters between 2.9
and 5.3 nm have been synthesized and assembled on mesoscopic TiO<sub>2</sub> films by electrophoretic deposition. Time-resolved emission
and transient absorption spectroscopy measurements have ascertained
the role of internal and surface defects in determining the solar
cell performance. An increase in power conversion efficiency (PCE)
was observed with the increasing size of QDs, with maximum values
of 2.14 and 2.51% for 3.9 and 4.3 nm size particles, respectively.
The drop in PCE observed for larger QDs (5.3 nm) is attributed to
decreased charge separation following bandgap excitation. Because
the origin of photocurrent generation in CuInS<sub>2</sub> QDSC arises
from the defect-dominated charge carriers, it offers the opportunity
to further improve the efficiency by controlling these defect concentrations
Effect of non-covalent self-dimerization on the spectroscopic and electrochemical properties of mixed Cu(i) complexes
A series of six new Cu(i) complexes with ([Cu(N-{4-R}pyridine-2-yl-methanimine)(PPh3)Br]) formulation, where R corresponds to a donor or acceptor p-substituent, have been synthesized and were used to study self-association effects on their structural and electrochemical properties. X-ray diffraction results showed that in all complexes the packing is organized from a dimer generated by supramolecular π stacking and hydrogen bonding. 1H-NMR experiments at several concentrations showed that all complexes undergo a fast-self-association monomer-dimer equilibrium in solution, while changes in resonance frequency towards the high or low field in specific protons of the imine ligand allow establishing that dimers have similar structures to those found in the crystal. The thermodynamic parameters for this self-association process were calculated from dimerization constants determined by VT-1H-NMR experiments for several concentrations at different temperatures. The values for KD (4.0 to 70.0 M−1 range), ΔH (−1.4 to −2.6 kcal mol−1 range), ΔS (−0.2 to 2.1 cal mol−1 K−1 range), and ΔG298 (−0.8 to −2.0 kcal mol−1 range) are of the same order and indicate that the self-dimerization process is enthalpically driven for all complexes. The electrochemical profile of the complexes shows two redox Cu(ii)/Cu(i) processes whose relative intensities are sensitive to concentration changes, indicating that both species are in chemical equilibrium, with the monomer and the dimer having different electrochemical characteristics. We associate this behaviour with the structural lability of the Cu(i) centre that allows the monomeric molecules to reorder conformationally to achieve a more adequate assembly in the non-covalent dimer. As expected, structural properties in the solid and in solution, as well as their electrochemical properties, are not correlated with the electronic parameters usually used to evaluate R substituent effects. This confirms that the properties of the Cu(i) complexes are usually more influenced by steric effects than by the inductive effects of substituents of the ligands. In fact, the results obtained showed the importance of non-covalent intermolecular interactions in the structuring of the coordination geometry around the Cu centre and in the coordinative stability to avoid dissociative equilibria.Fil: Cáceres Vázquez, Joaquín. Universidad de Santiago de Chile; ChileFil: Jara, Danilo H.. Universidad Adolfo Ibañez; ChileFil: Costamagna, Juan. Universidad de Santiago de Chile; ChileFil: Martínez Gómez, Fabián. Universidad de Santiago de Chile; ChileFil: Silva, Carlos. Universidad de Santiago de Chile; ChileFil: Lemus, Luis. Universidad de Santiago de Chile; ChileFil: Freire Espeleta, Eleonora. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Universidad Nacional de San Martín; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Baggio, Ricardo Fortunato. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; ArgentinaFil: Vera, Cristian. Universidad de Santiago de Chile; ChileFil: Guerrero, Juan. Universidad de Santiago de Chile; Chil